Tag thermal silicone pads

What Is Thermal Conductivity?

Whether it is the new energy automobile industry, electronic electrician, or LED industry, the application of thermal conductive materials is relatively common. In thermal management, thermal conductivity is an important parameter reflecting the thermal conductivity of materials, and it is also the most concerned technical indicator for users.

Thermal conductivity is a physical quantity that characterizes the thermal conductivity of a material. Its definition means that under stable heat transfer conditions, a 1m thick material has a temperature difference of 1 degree (K, ℃) on both sides of the material, within 1 second (1s), through the heat transferred by the area of 1 square meter, the unit is watt/meter·degree (W/(m·K), where K can be replaced by °C). ( Fourier’s law : The heat flux density at each point in a homogeneous material body is proportional to the temperature gradient. The direction of heat transfer is from high temperature to low temperature and the direction of temperature gradient is opposite from low temperature to high temperature. )

The thermal conductivity of a material is not only related to the material type of the material, but also closely related to its microstructure and filler content. In scientific experiments and engineering design, the thermal conductivity of the materials used needs to be accurately determined by experimental methods. There are many methods for measuring thermal conductivity, and they have different application fields, measurement ranges, precision, accuracy and sample size requirements. Different methods may have large differences in the measurement results of the same sample. , so choosing the appropriate test method is the first and foremost.

At present, the measurement methods of thermal conductivity are divided into two categories: steady-state method and non-steady-state method, with different test principles. In the thermal conductive silicone industry, the common test method is the steady-state hot plate method (reference standard: ASTM D5470)

Standard Test Method for Heat Transport Properties of Thin Thermal Conductive Solid Electrical Insulating Materials: ASTM D5470

This method uses the so-called steady-state heat flow method. The test principle is to place a sample of a certain thickness between the upper and lower plates, apply a certain heat flow and pressure to the sample, and use a heat flow sensor to measure the heat flow through the sample, Test the thickness of the sample and the temperature gradient between the hot plate and the cold plate, and then obtain the corresponding thermal resistance data under different thicknesses and fit a straight line to obtain the thermal conductivity of the sample.

The advantages of this approach are:

  1. It can test the thermal resistance and thermal conductivity of the product;
  2. It is especially suitable for simulating the use state of the product under actual working conditions.

Weakness is:

  1. There are certain requirements for the thickness of the product;
  2. Contact thermal resistance will affect the test results;
  3. In order to reach a steady state, the test takes a long time.

Thermal conductivity is a parameter of the material itself and has nothing to do with shape or size. At present, there are a large number of thermal conductivity test methods, but no one method can be applied to all products and all occasions. Product characteristics, test standards, test environments, etc. will all affect the results of thermal conductivity. The thermal conductivity of materials cannot be compared using data obtained from different test methods. To get accurate and informative results, it is necessary to select a suitable test method for measurement.

What Is Thermal Silicone Pad?

In the field of intelligent manufacturing, electronic instruments and meters such as transistors, automotive electronic components, power modules, printer heads, etc., need to pay special attention to the problem of heat conduction and heat dissipation during use, and thermal conductive silicone pad can solve this problem. So what is a thermal silicone pad? What are the characteristics of silicone thermal pad? Where is the thermal pad used? Let’s take a look together!

Definition of Thermal Silicone Pad

Thermal Silicone Pad is a kind of thermally conductive medium material synthesized by a special process by adding organic silica gel as the base material and adding various auxiliary materials such as metal oxides; in the industry, it is also known as thermal conductive silicone pad, thermal conductive silicone sheet, thermal conductive pad , thermal conductive silicone gaskets, etc., are specially produced for the design scheme of using gaps to transfer heat. They can fill gaps, open up the heat channel between the heat-generating part and the heat-dissipating part, effectively improve the heat transfer efficiency, and also play a role in insulation and shock absorption. , sealing and other functions, can meet the design requirements of equipment miniaturization and ultra-thin, it is extremely manufacturable and practical, and has a wide range of thicknesses, an excellent thermal conductive filling material.

Advantages of Thermal Silicone Pad

  1. The material is soft, the compression performance is good, the thermal conductivity and insulation performance are good, and the thickness can be adjusted in a relatively large range, suitable for filling the cavity, with natural viscosity on both sides, and strong operability and maintainability;
  2. The main purpose of selecting the thermal interface material is to reduce the contact thermal resistance between the surface of the heat source and the contact surface of the heat sink, and the thermally conductive silicone pad can fill the gap between the contact surfaces well;
  3. Since air is a poor conductor of heat, it will seriously hinder the transfer of heat between the contact surfaces, and installing a thermal silicone sheet between the heat source and the radiator can squeeze the air out of the contact surface;
  4. With the addition of thermal conductive silica gel pad, the contact surface between the heat source and the radiator can be better and fully contacted, so as to truly achieve face-to-face contact. The reaction at temperature can reach as small a temperature difference as possible;
  5. The thermal conductivity of the thermal gap filler is adjustable, and the thermal conductivity is better;
  6. The structural process difference of the thermal pad is bridged to reduce the process tolerance requirements of the radiator and heat dissipation structural parts;
  7. The thermal pad has insulating properties (this feature needs to be added with appropriate materials during production);
  8. The thermal silicone pad has the effect of shock absorption and sound absorption;
  9. The thermal silica pad has the convenience of installation, testing and reusability.

Disadvantages of Thermal Silicone Pad

Compared with thermal grease, thermal pad has the following disadvantages:

  1. Although the thermal conductivity is higher than that of thermal grease, the thermal resistance is also higher than that of silica thermal pad.
  2. The thermal silicone pad with a thickness of less than 0.5mm has a complex process and relatively high thermal resistance;
  3. The thermal grease has a larger temperature resistance range. They are thermal grease -60°C to 300°C, thermal silicone pad -50°C to 220°C;
  4. Price: Thermal grease has been widely used, and the price is relatively low. Thermal silicone pads are mostly used in thin, small and precise electronic products such as notebook computers, and the price is slightly higher.

Thermal Silicone Pad Application

  1. TFT-LCD notebook computer, computer host.
  2. High-power LED lighting, high-power LED spotlights, street lamps, fluorescent lamps, etc.
  3. Power devices (power supply, computer, telecommunications), automotive electronic modules (engine wiper) power modules, high-power power supplies, calculator applications (CPU, GPU, USICS, hard drives) and any place that needs to be filled with heat dissipation .
  4. Close contact between heating power devices (integrated circuits, power tubes, thyristors, transformers, etc.) used in electronic products and electronic equipment and heat dissipation facilities (heat sinks, aluminum casings, etc.) to achieve better thermal conductivity . Thermally conductive silicone insulating sheet.
  5. Thermal silicone pad is used for control motherboards of electronic and electrical products, inner and outer pads and foot pads of motors, electronic appliances, automotive machinery, computer mainframes, notebook computers, DVD, VCD and any materials that need to be filled and heat dissipation modules .

How To Test Whether The Thermal Pad Is Resistant To High Temperature

Thermal pad is often used in the thermal conduction and heat dissipation application scheme of electronic products. It has good thermal conductivity, and can maintain good stability under high temperature, acid and alkali conditions, high and low temperature resistance, and the operating temperature range is -50~200 ℃; then, how to test whether the thermal silicone pad really has high temperature resistance?

The commonly used method to test whether the thermal pad is resistant to high temperature is a simple aging test. The important goal of this test is to see how the silicon molecule volatilizes the thermal conductive silicone pad at high temperature. The specific methods are as follows:

  1. Select 10 samples and place them in a drying oven at 35 ℃ for 80–100h
  2. Put the sample into the oven at 200℃ and dry it continuously for 200h
  3. Take out the sample and place it in a drying oven at 35 ℃ for 80–100h
  4. Accurately weigh the weight G1 of 10 samples respectively
  5. Accurately weigh the weight G2 of the 10 samples again
  6. Calculate weight loss: (G1-G2)/G1×100%

Judgments based:

  1. The weight loss is less than 1%;
  2. All chemical and physical properties are stable after high temperature.

Through the above test steps, you can probably judge the high temperature resistance of a thermal pad, and provide more reference for choosing a suitable thermal silicone pad.

Does Thermal Resistance Have An Effect On Thermal Conductive Materials?

The heating of electrical equipment is a phenomenon that people often come into contact with in life and work. If the internal temperature of the equipment is not effectively controlled, equipment failure or even circuit short circuit may occur due to excessive temperature. So what is the heating of electrical equipment?

Electrical equipment is a kind of mechanical equipment that converts electrical energy into other energies. During operation, electrical energy will flow through the equipment, but when electrical energy is converted into other energies, complete conversion cannot be achieved, and some energy will be lost, and a large part of this energy will be lost. It is lost in the form of heat, which is one of the reasons why the electrical equipment will heat up when it is running.

Thermally conductive material is one of the materials specially designed to solve the problem of heat dissipation in the field of thermal management. In the past, people would install heat sinks on the surface of power-consuming electronic components, but the heat dissipation effect was very low and the temperature could not be effectively controlled. In the gap, no matter how smooth the surfaces of the two are, there is still a gap at the interface, and there is hot bad conductor air in the gap, so the heat conduction effect is very poor. At this time, it is necessary to fill the gap with a thermally conductive material, so that the two can be in close contact and eliminate the interface. Air to improve heat transfer, thereby improving heat dissipation.

There is a saying in the thermal conductivity material industry: purchasing depends on thermal conductivity, while engineering depends on thermal resistance. It is well known that thermal conductivity is the main point among the many parameters of thermally conductive materials. It is the standard for measuring the thermal conductivity of thermally conductive materials. However, for engineers, they often pay attention to thermal resistance. Does thermal resistance affect thermally conductive materials? The answer is yes.

In professional academic analysis, thermal resistance is the temperature difference formed at both ends of the object when the heat flow passes through the object. The thermal resistance reaction in the thermal conductive material is to guide the ability of the thermal material to hinder heat conduction. The greater the thermal resistance of the thermal conductive material, the stronger the ability to hinder the thermal conduction. The two sides of the surface are the starting point and the ending point. When the heat enters the thermal conductive material through the surface, it begins to conduct to the other side. The thermal resistance is the railing on the track, which hinders the transfer of heat. The greater the thermal resistance, the harder it is for heat to pass. Pass it to the other side, which is also the essence of thermal resistance.

Some people think that the higher the thermal conductivity of a thermally conductive material, the lower the thermal resistance. In fact, this is not true. The thermal resistance does not necessarily depend on the high or low thermal conductivity, but one thing can be said. For a thermally conductive material with the same other parameters except the resistance value, the thermally conductive material with a small thermal resistance value has a better thermal conductivity effect, whereas a thermally conductive material with a large thermal resistance value has a poor thermal conductivity effect.

When people buy or purchase thermally conductive materials, in addition to knowing their thermal conductivity, size and thickness, compressibility, and hardness, thermal resistance should also be paid attention to. After all, it is one of the key factors affecting the thermal conductivity of thermally conductive materials.

Why Is The Thermal Silicone Pad Oily?

The application of electrical and electronic equipment enriches people’s daily life and improves work efficiency. When the equipment is running, heat is often emitted, because part of the energy is lost when electrical energy is converted into other energy, and a large part of the energy will be heat. It is emitted in the form of heat, so manufacturers will use thermally conductive materials to assist the device to dissipate heat.

As one of the traditional thermal interface materials on the market, thermal silicone pads are widely used in industrial production. Thermally conductive silicone pads are made of silicone resin as the base material, and thermally conductive and heat-dissipating materials are added to make thermally conductive gap filling materials, generally in the form of solid sheets. The size and shape can be customized according to customer needs. Due to its good softness, it can effectively remove the air at the interface and has good contact. The surface of the device or shell can reduce the interface thermal resistance and improve the thermal conductivity.

Anyone who has used the thermal silicone pad will find that the thermal silicone pad will be oily after being used for a long time, so why does the thermal silicone pad, which is a solid sheet, have such a situation? Next, CoolThermo will explain to you.

It is normal for the thermally conductive silicone pad to emit oil, because most of the production process of the thermally conductive silicone pad is to mix silicone oil with heat-conducting, heat-resistant, and insulating materials in a certain proportion, and refining it through a specific machine, and the finished product is not much. There will be few small molecules that are free and not completely mixed. In a long-term heat and pressure environment, small siloxane molecules will slowly precipitate out. This is the reason why the thermally conductive silicone pad emits oil and why It is normal to say that the thermal conductive silicone pad is oily.

The oil output rate of the thermal silicone pad is an important factor affecting the reliability of electronic products. Although it is normal for the thermal silicone pad to emit oil, the thermal silicone pad is used as a thermal interface material to fill the gap between the heating element and the radiator. The direct contact between the two causes the siloxane small molecules to be adsorbed on the surfaces of the two after precipitation, which affects the performance and safety of electronic components, and causes pollution to the equipment.

Of course, it is not that the thermal conductive silicone pad has silicone oil precipitation and do not use it. The oil yield of the thermally conductive silicone sheet produced by the domestic big-brand thermal conductive silicone sheet manufacturers will be controlled within the qualified range, so when purchasing the thermally conductive silicone sheet, you should choose a well-known domestic Manufacturers of thermally conductive silicone sheets, especially recommend those high-quality manufacturers with their own R&D, production and quality departments.

How To Choose/Buy Thermal Silicone Pad

During the operation of any electronic device, a large amount of heat energy will be generated, and these will cause damage to many parts in the device. Therefore, in most electronic devices with different functions, a large number of thermal silicone pad with good market reputation will be used. Although the silicone thermal pad can indeed play a very good role, it must be under the premise of choosing the right thermal gap filler. So, what factors should be considered when choosing a thermal silicone pad? CoolThermo analyzes the selection criteria of thermal interface material for you.

Hardness

The thermal silicone pads is an accessory used between the parts in the electronic equipment. Its main function is to have a thermal conductivity effect as its name. However, because of the operation between the parts, a friction will be formed, and if the hardness of the thermal pads If it is too low, there will be hidden dangers, so the silicone thermal pads used in this position should pay more attention to whether its own hardness is more suitable, which is the guarantee to ensure that it plays a better role.

Viscosity

A good-quality thermally conductive silicone pad not only has good compressibility, thickness and hardness, but also must have good viscosity. This is because ordinary thermal insulation pads need to be glued on the outside during the production process. However, this method will cause the thermal resistance of this type of thermal interface material to increase, so that it cannot effectively isolate heat energy. Therefore, when choosing this type of thermally conductive product, you should pay attention to the viscosity of the thermal interface pad, because good thermally conductive silicone The stickiness of the sheet material itself will reach a higher standard.

Color

In fact, the color of the thermal conductive pad also has an impact on its own thermal conductivity. For example, the darker the color, the better the heat absorption capacity. Such a thermal silicone pad is very suitable for use in equipment that needs to reduce the temperature, while other shallow Colored thermal conductive pad are more suitable for thermal insulation devices, so when choosing a thermal gap filler pad, you should pay attention to its own color to choose.

Although the thermal silicone pad is a seemingly simple material with little technical content, in fact, the role of this gasket is obviously more important than what people know, so learning and understanding how to correctly select the thermal gasket pay attention to its true hardness, pay attention to its own stickiness, and pay attention to three-way matters such as choosing the right one from many colors.

Why Do Thermal Silicone Pad Have Bubbles? How To Deal With It?

Many thermal silicone pad manufacturers will inevitably encounter problems of one kind or another in the process of producing thermal silicone pad. One of the problems that plagues thermal silicone pad manufacturers is that the thermal silicone pad foams during the production process. Once the thermal silicone pad foams, it will be regarded as a defective product and thrown away without recycling or any other value, which directly increases the defect rate to the thermal silicone pad manufacturer and causes cost pressure. Then, Nuofeng Electronics analyzes the reasons and solutions for the foaming of thermal silicone pad.

There are many reasons for blistering in the production process of thermal silicone pad, which are mainly as follows:

  1. The vulcanization temperature is too low: the vulcanization temperature is an important parameter affecting the molding of silicone rubber. Usually the thermal silicone pads is set at 160~200℃, but sometimes the mold is too long due to the long operation time of the mold or other reasons. The temperature of the silicone molding mold is low, and there is a temperature difference with the vulcanization temperature of the silicone, which will cause the silicone product to foam after molding. In this regard, we only need to increase the molding temperature, or open the empty mold into the machine for a period of time and then operate to solve the problem.
  2. The vulcanization temperature is too high: The first point is that the vulcanization temperature is too low, which will cause the thermal conductive silicone to foam. In fact, in many cases, the molding temperature is too high. Why? When the molding temperature is too high, the silica gel material on the surface has already begun to be formed during the mold clamping and pressurization process. At this time, the air has been trapped inside and it is difficult to discharge, so it will cause molding bubbles. For this reason, it is only necessary to appropriately lower the molding temperature.
  3. Insufficient exhaust: After the silicone raw material is placed in the forming mold, a lot of air will be brought in at the moment of closing the mold, and it is impossible for the air to be integrated with the thermal conductive silicone material. If the air is not discharged, it will cause After the silicone is molded, air bubbles are formed on the surface.
  4. The structure of the mold is unreasonable: the unreasonable design of the silicone molding mold will also cause bubbles in the molding of thermally conductive silicone. For example, the arrangement of the products in the mold, the partition method, the mold parting method, and the design of the mold size will cause poor foaming. , but the cost of opening a set of molds is very high, and it is not easy to modify. If the silicone molding foams due to the structure of the mold, it is usually solved from the points mentioned above.
  1. The vulcanization time is too short: Like the vulcanization temperature, the vulcanization time is also one of the important parameters affecting the molding of the thermally conductive silica gel. The length of the vulcanization time determines whether the thermally conductive silica gel can be completely vulcanized. If the curing time is too short, it will not only cause the silicone to become soft after molding, but also more likely to cause surface bubbles. If such defects occur, the curing time of silica gel can be appropriately extended.
  2. The production process is also very important: the anti-aging agent RD is easy to produce bubbles during the mixing operation of the open mill, which is mainly due to the high melting point of the anti-aging agent RD and the low operating temperature of the open mill. Special attention should be paid to the dispersion of zinc oxide during refining, and the uniformity of its dispersion will also cause the generation of small bubbles, so the silicone rubber mixing process is also a very important part.
  3. Whether the moisture content of the raw materials used in the formula, the mixing operation and the extruded water vapor of the products, and whether the drying is sufficient after cooling, will also cause bubbles in the molding of the thermally conductive silica gel, which is mainly caused by the evaporation of water during vulcanization.

After the thermal silicone pad is foamed and then attached to the heat source to dissipate heat, it will not only affect the effective contact area of ​​the thermal silicone pad, but also air will enter the bubbles, thereby increasing the thermal resistance. The size of the effective contact area and the size of the thermal resistance are the two main performance parameters to judge the thermal conductivity of a thermal silicone pad except for the thermal conductivity. Therefore, the thermal silicone pad should not be shipped after foaming and must be classified as Defective products.

Thermal Interface Materials Apply in LED Lighting

Design challenges encountered in high-power LED lighting solutions are thermal design and thermal protection. A power and thermal management system is required for LED light sources because most of the electrical energy supplied to LEDs is converted to heat compared to other light sources. Without proper thermal management, this heat will affect the LED life and color output. Solving the heat dissipation problem of LED lighting fixtures is an indispensable link in the lighting design.

The thermally conductive materials commonly used in LED lighting fixtures are mainly divided into: structural thermally conductive materials and filling thermally conductive materials according to their functions in the lamps.

In addition to the function of the shell of the lamp, the structural thermal interface material is also used for the heat dissipation of the LED light source, such as thermal conductive plastics. The complementary thermal interface material is mainly used between the heating element and the heat dissipation element, as the connection between the two is used for heat conduction. Since the thermal conductivity of the thermal interface material relative to the heating element and the metal heat sink is low, the choice of the thermal interface material is also very important. Crucially, this determines how fast the heat is transferred.

The following are several thermal interface materials for high-power LED solutions:

Thermal grease: It has the characteristics of excellent thermal conductivity, electrical insulation, use stability, high and low temperature resistance, etc. It is a commonly used thermal conductive material for high-power LED lighting;

Thermal silicone pad: fill the air gap between the heating device and the heat sink or metal base to achieve heat transfer between the heating part and the heat dissipation part, and also play the role of insulation and shock absorption, which can meet the requirements of miniaturization and ultra-thin Design requirements, the ease of use is unmatched by thermal grease;

Thermal adhesive tape: Bonding between the heating sheet and the heat sink is simple and convenient to use, which is beneficial to improve production efficiency.

Potting compound: a room temperature curing one-component silicone adhesive sealant, non-corrosive to most metals; has excellent resistance to cold and heat alternating performance, aging resistance and electrical insulation performance, excellent moisture resistance, Shock resistance, corona resistance, anti-leakage performance.

At present, thermally conductive materials such as thermal conductive grease, thermal pads, thermal double-sided adhesive tape, and potting compound have been widely used in LED lighting solutions; CoolThermo, as a thermally conductive material manufacturer, is committed to providing customers with comprehensive solutions for LED lighting. , to meet customer one-stop purchasing needs.

What Is The Hardness of Thermal Silicone Pad? How to Test And Select Hardness of Themral Pad?

With the advent of the 5G era, thermal silicone pads are increasingly favored by the electronics manufacturing industry. The main reason is that thermal silicone pads are widely used, such as filling cooling devices, communication hardware, new energy vehicle control units, and drones. , base station, LED lighting, LCD display, medical beauty equipment, etc.; in these applications, the thermal silicone pad will produce a certain compression to bridge the gap to achieve good thermal conductivity.

When choosing a thermal silicone pads, you cannot just look at thermal conductivity, blocking voltage, thickness, density, and hardness is also very important; when choosing a thermal silicone pad, you must first consider the product structure, such as shape, specification, breakdown, temperature resistance range, thickness, density, thermal conductivity We all know that the thermal conductivity of a thermal silicone pad is an important indicator to measure its performance, and its hardness also affects the performance of the thermal silicone pad; many people have doubts about the hardness of the thermal silicone pad when choosing, so CoolThermo came to Analyze the hardness of the thermal silicone pads.

First of all, what is the concept of hardness?
Hardness, a technical term in physics, the ability of a material to locally resist the pressing of a hard object into its surface is called hardness. The local resistance of a solid to the intrusion of foreign objects is an indicator for comparing the softness and hardness of various materials. Hardness is used to characterize the degree of softness and hardness of a material, which refers to the ability of a material to resist local deformation, especially plastic deformation, indentation or scratching.

So, what is the hardness of the thermal silicone pad?

One advantage of high-quality silicone thermal pad is that the material is usually soft, and the softness precisely refers to the hardness of the silicone thermal pad. Its hardness directly reflects the soft and hard compressibility of the silicone thermal pad. A very important parameter in the physical properties of silicone thermal pads.

Thermal Silicone Sheet Hardness Test Standard

Since different test methods are specified, there are different hardness standards. The mechanical meanings of various hardness standards are different and cannot be directly converted to each other, but can be compared through tests. Common hardness is classified according to the test method: scratch hardness, indentation hardness, callback hardness. According to the specific hardness names, there are: Rockwell hardness, Brinell hardness, Leeb hardness, Shore hardness, etc.

According to the standard ASTM D2240 “Standard Test Method for Testing Rubber Hardness with Durometer”, the thermal silicone sheet uses Shore hardness to express its hardness. The corresponding measuring instrument for Shore hardness is the Shore hardness tester, which is mainly divided into three categories: A type, C type and 00 type. The measurement principle is exactly the same, the difference is the size of the stylus, especially the diameter of the tip, the 00 type is the largest, and the A type is the smallest. The Shore A durometer is suitable for measuring hard thermal pads; the Shore 00 durometer is suitable for measuring soft thermal pads.

Shore hardness belongs to indentation hardness. The test method is to insert a Shore hardness tester into the material to be tested. The pointer on the dial is connected to a needle through a spring, and the needle is used to pierce the surface of the tested object. The value displayed on the dial is the hardness. value.

Is the hardness of the thermal silicone pads good or low?

The lower the hardness of the thermal silicone pads, the softer the product and the higher the compression rate, which is suitable for use in low-stress environments. Conversely, the higher the hardness of the thermal pad, the harder the product and the lower the compression rate. Under the same application conditions, products with low hardness have higher compressibility, shorter heat conduction paths, shorter heat transfer time, and better heat conduction effect than products with high hardness.

However, it is not that the lower the hardness, the better. The thermal conductive gasket has a certain hardness so that it is not easy to deform. Generally speaking, thermally conductive gaskets with higher hardness have better mechanical properties. In the application, it is necessary to comprehensively consider the actual situation to select a thermally conductive gasket with appropriate hardness.

How to Know The False Standard of Thermal Conductivity of Thermal Silicone Pad?

Thermal silicone pad is also known as thermally conductive silicone gasket or thermal pads. Usually, the more intuitive standard that reflects the quality of heat conduction is the parameter value of thermal conductivity. The thermal conductivity of the thermal pad is one of the important parameters that can most directly reflect the performance of the thermal silicone gasket.

The importance of the thermal conductivity of thermal pads and the fact that most customers do not have instruments for testing the thermal conductivity of thermal pads, it is inevitable that the thermal conductivity of thermal pads has a false standard in the industry, and this chaos has always been troubled And it affects our customers to make correct judgments when purchasing thermal pads. As a domestic manufacturer of high-quality thermal pads, Nuofeng Electronics will give you an in-depth analysis of the industry chaos of false thermal conductivity of thermal pads today and the solution on how to avoid false thermal conductivity of thermal pads.

Today’s thermal pad industry is mixed, and the product quality is uneven. You should have noticed that the thermal conductivity of the high thermal pads produced by some domestic suppliers is 8.0W/m.k, and even some suppliers even mark the phenomenon of false labels above 10W/m.k. As far as the domestic silicone thermal conductive sheet is concerned, the thermal conductivity of 3W/m.k is already a technical threshold. The thermal conductivity of the thermal pads can reach 8.0W/m.k. There are only a few in China, and CoolThermo domestic thermal gaskets The thermal conductivity of high-quality manufacturers can be up to 8.0W/m.k, and the thermal conductivity of such a high thermal pad is currently unsurpassed by domestic counterparts.

It is estimated that many people will have such questions: since the thermal conductivity of thermal silicone pads so important, there should be a strict industry unified standard for the determination of the thermal conductivity of such products! In fact, this is not the case. The thermal conductivity measurement of thermal silicone pads is now a red sea in the entire industry, with chaos that you can’t imagine. Some manufacturers of thermal gaskets have the phenomenon of falsely high thermal conductivity, and in China, this phenomenon of falsely high and random standards is also very common.

CoolThermo encountered such a real case, a customer in Guangzhou who is engaged in high-end beauty equipment, found our sales staff and asked: What is the price of 15.0W/m.k high thermal conductivity silicone sheet. Our sales staff told the customer truthfully that the thermal conductivity of thermally conductive silicone gasket products is 6.0W/m.k and 8.0W/m.k. At present, there is really no 15.0W/m.k silicone thermal conductivity product on the market. . Our salesman asked the customer with a big question mark: which brand of thermal conductivity product you are using, is it an imported brand? Because our business people also find it strange, even in the world’s first-tier brand industry, I haven’t heard much about thermally conductive silicone gaskets with a thermal conductivity of 15.0W/m.k. Besides, the thermal conductivity of thermally conductive silicone gaskets exceeds 8.0W/m.k. , Few suppliers in the industry can do it. After some detailed understanding and inquiries, I got feedback from the customer because the supplier he is currently working with told them that the high thermal conductivity gaskets of 15.0W/m.k were sold to them, and this kind of high thermal conductivity gaskets can satisfy him The heat conduction heat demand of high-power products, but the price of the thermal silicone pads currently used is too high, so I want to find a low-cost thermally conductive silicone gasket material.

Encountering this kind of problem, the rich experience of CoolThermo business personnel is highlighted. It is estimated that there is a false standard for this so-called 15.0W/m.k high thermal conductivity gasket. First of all, let the customer send us the thermal pad sample on his hand for a detailed test report, and don’t let the falsely high thermal conductivity mislead the customer. Then we deeply understand the heat dissipation temperature requirements of the customer’s own products, and then recommend our CoolThermo LC600 thermal pad to send samples to the customer for product effect testing. The test results reported by the customers were expected by the CoolThermo business staff, and they began to make bulk purchases. The thermal conductivity gasket LC600 with a thermal conductivity of only 6.0W/m.k can meet the thermal conductivity of 15.0W/m.k required by customers. What is going on?

First of all, let’s analyze from the thermal conductivity measuring instrument: although the thermal conductivity testing standard has been standardized, but the testing instruments are different, and there is a huge gap in the test results. Because different thermal conductivity test instruments have different test principles and measurement standards. For example, the thermal conductivity of CoolThermo’s LC600 thermal pad is tested with the ASTM D5470 standard. The thermal conductivity measured by the Swiss HOTDISK testing instrument is 6.0W/m.k (Note: The international thermal conductivity material first-line brand measurement standard, there are few domestic thermal conductivity material manufacturers. Using Swiss HOTDISK test equipment). And we also used the ASTM D5470 test standard, and replaced it with the thermal conductivity tester of the Taiwan Ruiling brand to test the thermal conductivity of the LC600 thermal pad, which can reach 12W/m.k. And this experiment fully shows that many small manufacturers in our country’s high thermal conductivity test reports use measuring instruments that are not used in the world to conduct false height tests.

Furthermore, domestic thermal silica sheet manufacturers use different testing institutions and different test standards when calibrating thermal conductivity, resulting in huge differences in thermal conductivity values.
The following is a brief introduction to the thermal conductivity testing methods commonly used in the thermal conductive material industry:

  1. The European and American thermal conductive materials generally use the American laboratory standard ASTM5470, and Beggs and Laird belong to the earlier standards in the thermal conductivity industry.
  2. Domestic benchmark enterprises generally adopt the test standard of the Fifth Institute of Electronics of the Ministry of Industry and Information Technology (China Saibao Laboratory), which is more consistent with ASTM5470.
  3. Taiwan-based thermal conductive materials generally use ASTM E1530 test method, which is generally used in Taiwan or small domestic manufacturers. The measured data will be higher than the data tested by ASTM5470 and Saibao.
  4. The JIR test standard is generally used for the determination of Japanese thermally conductive materials. Fuji, Japan Electric. Closer to ASTMD5470.
  5. The data tested by the Beijing Rocket Research Institute (102 institutes) is outrageous. Generally, it will be much higher than the standard test method. The thermal conductivity of 12W/m.k comes from this.

So much has been said before, what should I do if I encounter a thermal silicone pads with a false thermal conductivity?
CoolThermo has been focusing on the research and development, production and sales of thermal silicone pads for ten years. In response to the problem of false thermal conductivity of thermal silicone pads, CoolThermo recommends choosing a manufacturer with strength and reputation. In the next issue, I will introduce “How to Correctly Choose Thermal Silicone Sheet Manufacturers”

As a high-quality domestic thermal silicone gasket company, CoolThermo always insists on using imported raw materials (imported thermal conductive silicone gasket powder and thermal oil), controls the quality of products from the source, maintains the brand image of CoolThermo, and does not compete with some peers Cowardly, play the game of artificially high thermal conductivity to deceive consumers and deceive customers, and do CoolThermo’s own power for China’s manufacturing.

Language »