What is the difference between one-component thermal gel and two-component thermal gel?

What is the difference between one-component thermal gel and two-component thermal gel?

Thermal gel can be widely applied to various electronic products, the contact surface between the heating element and the heat dissipation facility in the electrical equipment, as a heat transfer medium and has the properties of moisture-proof, dust-proof, corrosion-proof and shock-proof. Thermal gel can be divided into one-component thermal gel and two-component thermal gel according to functional applications. What is the difference between one-component thermal gel and two-component thermal gel? We together look!

One-component thermal gel

One-component thermal gel belongs to room temperature curing silicone rubber. It is a one-component electronic thermally conductive thermal gel that is mainly made of silicone and refined from high-quality thermally conductive materials, fillers and other polymer materials. It releases low molecules through condensation reaction with moisture in the air to cause cross-linking, and vulcanizes into a high-performance elastomer. After complete curing, it has excellent resistance to high and low temperature changes, and will not reduce heat dissipation due to contact gaps after components are fixed. .

One-component thermal gel has excellent thermal conductivity and heat dissipation performance, as well as excellent electrical properties, aging resistance, anti-cold and heat alternating performance, moisture resistance and non-swelling, electrical insulation performance, power decay rate, shock resistance, waterproof, vibration absorption and Stability increases the safety factor of electronic products during use. It has excellent bonding strength to electronic components, PVC, plastics, etc., as well as excellent sealing and thermal conductivity.

One-component thermal gel is easy to use and operate, and can be applied manually or mechanically, without leakage of glue, which can meet a variety of working environments and working conditions, and has the performance of simple and convenient gluing; one-component thermal gel is a kind of Non-toxic, non-polluting products, safer and more environmentally friendly.

Two-component thermal gel

Two-component thermal gel is used as a heat transfer medium for cooling electronic devices, and can be cured into a soft elastomer in situ without stress to electronic components. After curing, it is closely attached to its contact surface to reduce thermal resistance, which is more conducive to the heat conduction between the heat source and its surrounding heat sinks, motherboards, metal shells and shells.

Two-component thermal gel has the advantages of high thermal conductivity, good insulation performance and easy to use. Two-component thermal gel is generally divided into two categories: condensation type and addition type.

Condensed type

Usually A:B is a weight ratio of 10:1. Main advantages: good adhesion, relatively soft. Disadvantages: slow curing time and poor thermal conductivity.


Usually A:B is a weight ratio of 1:1, the higher the temperature, the faster the curing, the main advantage: the solid is softer and protects the electronic device more. Disadvantages: poor adhesion.

The difference between one-component thermal gel and two-component thermal gel

  1. The one-component thermal gel does not absorb or release heat during curing. After curing, the shrinkage rate is small, and the adhesiveness to the material is good, but it is not easy to carry out secondary repair. The two-component thermal gel has elasticity after curing, and can be Repair an area.
  2. One-component thermal gel does not need to configure the ratio of silica gel to curing agent. The curing agent is already added to the silica gel. The operation process is simple, no mixing or defoaming operation is required, just extrude the tube container, two-component Thermal silica requires that components A and B will not gel quickly after mixing, so they have a long operating time.
  3. One-component thermal gel is only suitable for small-area potting, and the thickness should not exceed 6mm. Two-component thermal gel is more suitable for large-area potting operation. It has low viscosity and good fluidity, and is suitable for molding complex electronic parts.

Through CoolThermo’s introduction to the characteristics and differences of one-component and two-component thermal gel, do you have more knowledge about thermal gel?

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