5:1 Fire Retardant High Temperature Resistant Epoxy Potting Compound Black Epoxy

HN-5508AB is a black two-component epoxy potting compound with a 5:1 mix ratio, specially formulated for power supply module, LED driver and other electronic component encapsulation. It cures at room temperature or low temperature with low viscosity, long working time and good fluidity, easily penetrating into narrow clearances of the product. After curing it delivers a bubble-free, smooth and glossy surface with high hardness, excellent flame retardancy and long-term high temperature resistance.

• 5:1 two-component system: simple weight-ratio mixing, low viscosity 4,500-6,000 cps (Part A), excellent penetration for dense coil and PCB assemblies.
• Fire retardant & high temperature resistance: heat distortion temperature 130-150℃, low temperature resistant to -30℃, suitable for continuously operating power modules.
• High electrical insulation: dielectric strength 20-22 kV/mm, volume resistivity 1.1×10¹⁵ Ω·cm, protects power supply circuits from arcing and moisture.
• Low shrinkage & low water absorption: shrinkage 0.35-0.55%, water absorption <0.03%, stable dimensional and electrical performance in humid environments.
• Fast curing options: 25℃/6-8H surface dry and 12-16H fully cured, or accelerated 60-80℃/1.5-2H for high-volume production lines.
• ROHS SGS compliant: meets international environmental requirements for electronic encapsulation materials.

HN-5508AB is widely used for power supply modules, LED drivers, transformers, resistors, filters, temperature sensors and controllers, ignition coils, high voltage packs and other electronic components requiring flame retardant, high temperature resistant and moisture-proof encapsulation.

Standard packing 25 kg/barrel; 1 kg sample kits available for evaluation. Store in a cool, dry and light-proof place, keep the workshop dust-free, and cover the unused glue promptly after opening. Shelf life 6 months under sealed storage at 25℃.

Shenzhen Hanast New Material Co., Ltd. is a premier high-tech enterprise and leading source manufacturer specializing in the R&D, manufacturing, and global supply of industrial silicone materials. As a strategic branch of the renowned Shenzhen Kanglibang Technology Co., Ltd., Hanast integrates over a decade of chemical adhesive expertise with a cutting-edge 40,000-square-meter modern production base (including our newly expanding Jiangmen facility) to deliver high-capacity, reliable material solutions worldwide.

We serve as a vital tier-one supplier and OEM/ODM partner for global factories, procurement managers, and engineering teams across diverse sectors, including electric vehicles (EV), battery energy storage systems (BESS), solar inverters, LED lighting, and industrial automation.

Q1: What is HN-5508 A/B and which applications does it suit?
A1: HN-5508 A/B is a 5:1 two-component epoxy potting compound with Shore D 85-95 hardness and high dielectric strength. It is widely used for temperature sensors, temperature controllers, transformers, resistors, filters, power supplies, high-voltage packages and circuit boards.

Q2: Is it one-part or two-part, and what are the cure options?
A2: It is a two-part (two-component) epoxy with a 5:1 mix ratio by weight. It can be cured at room temperature in 12-16 hours (tack-free in 6-8 hours), or accelerated at 60-80°C in 1.5-2 hours.

Q3: What are the hardness and electrical insulation properties?
A3: Cured hardness is Shore D 85-95 for rigid protection, with a dielectric strength of 20-22 kV/mm and volume resistivity of 1.1 x 10¹⁵ ohm.cm for reliable electrical insulation.

Q4: What is its temperature and environmental performance?
A4: It withstands -30°C and a heat distortion temperature of 130-150°C, and provides acid/alkali resistance, moisture proofing and aging resistance for harsh environments.

Q5: Can I request samples, and what are the MOQ, packaging and delivery time?
A5: Yes, samples are available. MOQ is 1 kg, supplied in 30 kg/set kits (25 kg A + 5 kg B). Samples ship in 3-5 working days and bulk orders in 7-15 days, with bulk supply and factory-direct pricing.