Power modules, LED drivers, and sensors must move component heat toward the enclosure while accommodating parts and gaps of different heights. If mix ratio, working time, and cure conditions are not built into the process, the result may include uneven mixing, localized voids, or a cure cycle that does not fit production. H-GF-GY two-part thermal silicone encapsulant is an addition-cure silicone system that can cure at room temperature or be accelerated with heat.
How two-part potting works
Parts A and B are stirred separately and then combined at the specified ratio so the mixed material can flow around PCB assemblies, coils, and discrete components. After curing, the flexible encapsulation layer can form a thermal path between components and a metal enclosure while providing electrical insulation and environmental protection. Fill volume, degassing, and cure timing should still be confirmed against the actual module and production process.
Five core technical points
- Part A is a white fluid and Part B is a gray fluid, with a published 1:1 mix ratio by weight.
- Published component viscosity is 30,000 cps under ASTM D2196.
- Working time after mixing is 40–60 minutes at 25°C.
- Published cure conditions are approximately 480 minutes at 25°C or 20 minutes at 80°C.
- Published dielectric strength is 10 kV/mm under ASTM D149.
Electronic potting applications
Published applications include high-power LED lamps, power supplies, transformers, sensors, and coils. In these assemblies, the two-part thermal encapsulant can conform around component geometry; the product page also lists 1.0 and 3.0 W/m·K thermal-conductivity options, so the grade should be selected according to heat load, potting thickness, and enclosure design.
Process and selection reminders
Before production, verify that the metering equipment can maintain the 1:1 ratio and that dispensing, filling, and any required vacuum degassing can be completed within the working window. When heat curing is used, confirm that the PCB, connectors, and other components tolerate the selected temperature. Larger fill volumes should be evaluated with the actual module for cure behavior and thermal performance.
Build a repeatable potting process
Two-part potting is a coordinated process of proportioning, mixing, dispensing, and curing rather than a single pouring step. For an electronic-module thermal management and protection project, review the thermal conductive silicone encapsulant product data, then confirm the grade against component layout, fill depth, and production cycle.
Topic tags: two-part thermal encapsulant, electronic module potting, thermal management, electrical insulation, PCB protection
