CTE Matched Thermal Cycling Resistant Epoxy Potting Compound Shore D 85 for Motor Stator Encapsulation

HANAST HN-5508 A/B CTE Matched Thermal Cycling Resistant Epoxy Potting Compound for Motor Stator and Power Module Encapsulation

HN-5508 A/B is a two-component, room-temperature or heat-curable epoxy potting compound engineered for electronics exposed to repeated thermal cycling. 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 CTE-matched, low-shrinkage (0.35-0.55%) formulation, high dielectric strength, low outgassing and a wide -30°C to 130-150°C service range, it is a dependable choice for potting motor stators, power modules and other electronics that must survive thermal shock, humid heat ageing and thermal cycling without cracking or delamination.

Key Features

• CTE-matched formulation for reduced thermal-expansion stress on sensitive components
• Thermal cycling and thermal shock resistant, with good dimensional stability
• Electronics-grade, high-reliability formulation for long-life component protection
• Designed for harsh and wide-temperature environments (-30°C to 130-150°C)
• 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
• Low shrinkage (0.35-0.55%) for precision, dimensionally stable potting
• Low outgassing, vacuum-degassing-friendly formulation for sealed electronics
• Acid/alkali resistance, moisture proofing and humid-heat ageing resistance
• 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
• RoHS compliant and classified as non-dangerous goods for global shipment
• Custom OEM/ODM with free samples and wholesale bulk supply

Technical Specifications

Applications

HN-5508 A/B is widely used for potting and protection of electronics exposed to thermal cycling: electric motor stators, power supply modules, transformers, resistors, filters, temperature sensors, temperature controllers, industrial sensors and current/voltage sensors; automotive ECU 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; high-voltage ignition coils, high-voltage packages, downhole electronics, PCBs, aquarium and underwater equipment, negative-ion generators and ultrasonic atomizers. It suits sealed, vacuum and harsh-environment electronics that require CTE matching, electronics-grade insulation and long-term reliability.

Why Choose HN-5508 A/B

With a CTE-matched, low-shrinkage formulation, high hardness, high dielectric strength and a low-void, vacuum-degassing-friendly cure, HN-5508 A/B is one of the best potting compounds for reliable electronics protection under thermal cycling. Hanast is a direct manufacturer based in Shenzhen, Guangdong, China, with a dedicated R&D laboratory. We supply free samples and wholesale bulk epoxy encapsulant across Asia and worldwide at factory-direct pricing, and offer custom OEM/ODM formulation of colour, viscosity, pot life, hardness, CTE and cure speed to match your specific motor stator, power module or sensor design.

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 motors, electric vehicles (EV), battery energy storage systems (BESS), solar inverters, LED lighting, and industrial automation.

FAQ

1. Q1: What is HN-5508 A/B and which applications does it suit?
   A1: HN-5508 A/B is a 5:1 two-component CTE matched, thermal cycling resistant epoxy potting compound with high hardness (Shore D 85-95) and high dielectric strength, designed for motor stators, power modules, transformers, sensors and other electronics exposed to repeated thermal cycling.
2. Q2: How does it perform under thermal cycling and CTE-related stress?
   A2: It offers a 130-150°C heat distortion temperature, -30°C low-temperature resistance, low shrinkage (0.35-0.55%) and a CTE-matched formulation for reduced thermal-expansion stress, giving good dimensional stability and resistance to thermal cycling, thermal shock, humid-heat ageing and cracking.
3. Q3: What are the mix ratio and curing schedule?
   A3: 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); 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.
4. Q4: Can it be vacuum-degassed, and what is the insulation performance?
   A4: Yes, it can be vacuum-degassed to remove air 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.
5. Q5: Do you offer samples, customization and wholesale supply?
   A5: Yes. We are a direct China manufacturer offering free samples and wholesale bulk supply at factory-direct pricing, with custom OEM/ODM formulation of colour, viscosity, pot life, hardness, CTE and cure speed. MOQ is 1 kg 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.