High Temperature Resistance Epoxy Potting Compound with 20-22 kV/mm Dielectric Strength and Low Shrinkage for Harsh Environments

HANAST HN-5508 A/B High Temperature Black Epoxy Potting Compound for Downhole, Power Module and Harsh-Environment Electronics Encapsulation

HN-5508 A/B is a two-component, room-temperature or heat-curable epoxy potting compound engineered for high-temperature and harsh-environment electronics. Mixed at a 5:1 ratio by weight, it flows with low viscosity and a long pot life, penetrates narrow gaps, and cures bubble-free into a smooth, glossy, high-hardness (Shore D 85-95) black encapsulant with a 130-150°C heat distortion temperature. Supplied in bulk with factory-direct wholesale pricing, it delivers high dielectric strength, high compressive and bonding strength, and excellent acid/alkali, moisture and humid-heat ageing resistance for downhole, power and outdoor electronics.

Key Features

• High temperature resistance: 130-150°C heat distortion temperature with -30°C low-temperature performance
• 5:1 two-component epoxy system, room-temperature cure or 60-80°C accelerated cure
• High hardness Shore D 85-95 for rigid, impact-resistant component protection
• High dielectric strength of 20-22 kV/mm with volume resistivity of 1.1 x 10¹⁵ ohm.cm
• Acid/alkali resistance, moisture proofing and humid-heat ageing resistance for harsh environments
• Good resistance to thermal cycling for wide-temperature and downhole service
• Low outgassing cure suitable for vacuum-degassed, sealed electronics
• High compressive strength (18-22 kg/cm²) and high bonding strength
• Low viscosity and long pot life (2-3 h) for easy casting and narrow-gap penetration
• Cures to a bubble-free, smooth, glossy surface with low shrinkage (0.35-0.55%)
• RoHS compliant and classified as non-dangerous goods for global shipment
• Bulk supply with factory-direct wholesale pricing and custom OEM/ODM formulation

Technical Specifications

Applications

HN-5508 A/B is widely used for potting and protection of high-temperature and harsh-environment electronics: downhole and oil & gas electronics, power supply modules, EV battery packs and BMS boards, onboard chargers, LED drivers, 5G base station power units, solar inverter modules, wind turbine converters and hydrogen fuel cell components; transformers, resistors, filters, temperature sensors, temperature controllers, industrial sensors and motor stators; high-voltage ignition coils, high-voltage packages, automotive ECU modules, PCBs, aquarium and underwater equipment, negative-ion generators and ultrasonic atomizers. It suits sealed, outdoor and wide-temperature electronics that require heat resistance, insulation and long-term reliability.

Bulk Supply & Custom OEM / ODM

Hanast is a direct potting compound manufacturer based in Shenzhen, Guangdong, China, with a dedicated R&D laboratory and high-volume production capacity. We supply HN-5508 A/B in bulk at factory-direct wholesale pricing, with free samples and fast lead times, and offer custom OEM/ODM formulation of colour, viscosity, pot life, hardness and cure speed to match your downhole, power module or sensor design. Wholesale epoxy encapsulant supply is available across Asia and worldwide.

Packaging & Storage

Supplied as Component A (25 kg plastic barrel) and Component B (5 kg plastic pot), or as a ready 30 kg/set kit. Store in original, tightly sealed containers in a cool, dry, well-ventilated area at around 25°C, protected from direct sunlight, moisture and extreme temperatures. Shelf life is 6 months from date of manufacture. Classified as non-dangerous goods for transport.

About this supplier

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.

FAQ

Q1: What is HN-5508 A/B and which applications does it suit?
A1: HN-5508 A/B is a 5:1 two-component high temperature black epoxy potting compound with high hardness (Shore D 85-95) and high dielectric strength. It is designed for encapsulating downhole electronics, power modules, transformers, sensors, EV battery packs and other harsh-environment electronics.

Q2: What is its high temperature performance and curing schedule?
A2: It withstands a 130-150°C heat distortion temperature with -30°C low-temperature performance. Mix A and B at 5:1 by weight; pot life is 2-3 hours at 25°C, tack-free in 6-8 hours and fully cured in 12-16 hours at 25°C, or in 1.5-2 hours at 60-80°C when curing time needs to be optimized.

Q3: Is it suitable for downhole and harsh environments?
A3: Yes. Its acid/alkali resistance, moisture proofing, humid-heat ageing resistance and good thermal cycling performance make it suitable for downhole, oil & gas and other wide-temperature, sealed electronics.

Q4: Can it be vacuum-degassed, and what is the insulation performance?
A4: Yes, it can be vacuum-degassed to remove air bubbles for void-free potting. It offers high dielectric strength of 20-22 kV/mm and volume resistivity of 1.1 x 10¹⁵ ohm.cm for reliable electrical insulation.

Q5: Do you supply in bulk, and what about samples, MOQ and wholesale pricing?
A5: Yes. We are a direct China manufacturer supplying HN-5508 A/B in bulk with factory-direct wholesale pricing. MOQ is 1 kg in 25 kg (A) + 5 kg (B) 30 kg/set kits; free samples ship in 3-5 working days and wholesale/bulk orders in 7-15 days, with supply available across Asia and worldwide.