5:1 Mix Ratio Flame Retardant Epoxy Potting Compound with Shore D 85-95 Hardness for EV Battery Encapsulation

HANAST HN-5508 A/B 5:1 Flame Retardant Epoxy Potting Compound for EV Battery, Power Module and New-Energy Electronics Encapsulation

HN-5508 A/B is a two-component, room-temperature or heat-curable epoxy potting compound engineered for the electronics, electrical and new-energy industries. 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. It combines flame retardancy, high dielectric strength, high compressive and bonding strength, and excellent acid/alkali, moisture and humid-heat ageing resistance, making it a dependable choice for encapsulating and protecting EV battery modules, power modules, transformers, sensors and other high-reliability electronic components.

Key Features

• 5:1 two-component epoxy system, room-temperature cure or 60-80°C accelerated cure
• Flame retardant, 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
• Wide service range from -30°C to a 130-150°C heat distortion temperature with good resistance to thermal cycling / thermal shock
• Acid and alkali resistance, moisture proofing and humid-heat ageing resistance for harsh and sealed environments
• Low outgassing formulation suitable for vacuum-degassed, hermetically sealed power modules and battery packs
• 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
• Custom OEM/ODM formulation of colour, viscosity, pot life, hardness and cure speed

Technical Specifications

Applications

HN-5508 A/B is widely used for potting and protection of electronic and electrical components across new-energy and industrial sectors: EV battery packs, BMS boards, onboard charger modules, hydrogen fuel cell stacks and energy storage (BESS) modules; power supply modules, 5G base station power units, solar inverter modules and wind turbine converters; transformers, resistors, filters, temperature sensors, temperature controllers, industrial sensor housings and motor stators; high-voltage ignition coils, high-voltage packages, automotive ECU modules and LED driver boards; PCBs, aquarium and underwater equipment, negative-ion generators and ultrasonic atomizers. It also suits harsh-environment, sealed and outdoor electronics that require flame retardancy, acid/alkali resistance, moisture proofing and reliable electrical insulation.

Factory Direct & Custom OEM / ODM

Hanast is a direct potting compound factory based in Guangdong, China, with a dedicated R&D laboratory. We offer custom OEM/ODM formulation of colour, viscosity, pot life, hardness and cure speed to match your specific battery pack, power module or sensor design, with samples delivered in 3-5 working days, bulk supply and factory-direct pricing. Bulk 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 flame retardant black epoxy potting compound with high hardness (Shore D 85-95) and high dielectric strength. It is designed for encapsulating EV battery packs, power modules, transformers, sensors, ignition coils, solar inverters and other high-reliability electronics.

Q2: What are the mix ratio and curing schedule?
A2: Mix Component A and Component B at a 5:1 ratio by weight. Pot life is 2-3 hours at 25°C (100 g mix); it is 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 for accelerated cure.

Q3: What are its electrical insulation and temperature performance?
A3: It offers high dielectric strength of 20-22 kV/mm and volume resistivity of 1.1 x 10¹⁵ ohm.cm, with a heat distortion temperature of 130-150°C and low-temperature resistance down to -30°C, plus flame retardancy and acid/alkali and moisture resistance for harsh environments.

Q4: Is HN-5508 A/B RoHS compliant, and can it be customized?
A4: Yes. HN-5508 A/B is RoHS compliant and classified as non-dangerous goods. We provide custom OEM/ODM formulation of colour, viscosity, pot life, hardness and cure speed to suit your battery, power module or sensor application.

Q5: What are the MOQ, packaging and delivery time?
A5: Minimum order quantity is 1 kg, supplied in 25 kg (A) + 5 kg (B) 30 kg/set kits. Samples ship in 3-5 working days and bulk orders in 7-15 days, with bulk epoxy encapsulant supply available across Asia and worldwide.