5:1 Mix Ratio Long Pot Life 2-3 h High Fluidity Black Epoxy Potting Compound for BMS and Rail Transit Power Module Epoxy Encapsulant

HN-5508A/B is a two-component epoxy potting compound that cures at room temperature or low temperature. It combines low viscosity, a long operating time of 2-3 hours and excellent fluidity, so the mixed resin penetrates narrow gaps and fills complex housings completely. After curing it forms a bubble-free, smooth, glossy and high-hardness encapsulant with strong electrical insulation, compressive strength and bonding strength. The product is RoHS compliant and is classified as non-dangerous goods for transport.

• Long pot life of 2-3 hours per 100 g mix at 25 °C, suitable for multi-cavity and mass-production potting
• Low viscosity and high fluidity for fast filling and penetration into narrow gaps and fine clearances
• Bubble-free, smooth and glossy surface after cure with high hardness Shore D 85-95
• Excellent electrical insulation with dielectric strength 20-22 kV/mm
• Good acid and alkali resistance, moisture proofing and humid-heat ageing resistance
• High compressive strength and bonding strength for rigid protection of components
• Room-temperature cure or 60-80 °C heat-accelerated cure for flexible production planning
• RoHS compliant, environmentally friendly formulation

The product is widely used for insulation, flame retardancy and temperature resistance in electronic and electrical components, including:

• Energy storage and mobility: BMS battery management systems, EV battery packs, EV onboard chargers (OBC), rail transit traction converters, auxiliary power modules, charging piles and motor stators
• Power electronics: power supply modules, 5G base station power supplies, solar/photovoltaic inverters, wind turbine converters, IGBT modules, capacitors and high-voltage packages
• Industrial and automotive electronics: automotive ECUs, sensors, temperature sensors, temperature controllers, ignition coils, relays, contactors and industrial control modules
• Lighting and consumer electronics: LED drivers, LED power supplies, PCB assemblies, display power boards, aquarium equipment, negative-ion generators and ultrasonic atomizers
• Passive components: transformers, resistors, filters, inductors and coils
• Harsh environments: humid, damp, mildly acidic or alkaline atmospheres, and outdoor equipment requiring moisture-proof sealing

All values are measured at 25 °C and 60% RH after the recommended cure schedule and are for reference only.

1. Pre-mix: Stir Component A thoroughly before use. If stored in a humid environment, warm gently in a low-temperature oven to restore.
2. Weighing: Accurately weigh A and B at 5:1 by weight, not by volume.
3. Mixing: Mix with a flat-bladed tool or small mixer; do not use a round stir rod without resistance. Scrape the container walls and bottom.
4. Degassing: For void-sensitive parts, degas under vacuum to remove air introduced during mixing.
5. Pouring: Pour into the clean, dry device within the 2-3 hour pot life. The high fluidity supports manual pouring and automatic dispensing/metering equipment. Keep the area dust-free.
6. Curing: Cure at 25 °C for 12-16 hours, or at 60-80 °C for 1.5-2 hours. Do not move or stress the part during cure.

• Component A: 25 kg plastic barrel; Component B: 5 kg plastic pot; kit: 30 kg/set
• Store sealed in a cool, dry, well-ventilated area below 25 °C, away from direct sunlight and moisture
• Shelf life: 6 months from the date of manufacture under recommended storage
• Transport: non-dangerous goods (general chemicals)

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 and epoxy 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 sensors, electronics, electric vehicles (EV), battery energy storage systems (BESS), solar inverters, LED lighting, and industrial automation. Headquartered in Shenzhen, Guangdong, China, we offer free samples, custom formulation and wholesale bulk supply at factory-direct pricing.

A: HN-5508A/B is a two-component, 5:1 black epoxy potting compound with long pot life, good fluidity and high hardness. It suits BMS, rail transit traction converters, EV onboard chargers, power modules, 5G base station power supplies, solar inverters, wind turbine converters, motor stators, automotive ECUs, LED drivers, transformers, resistors, filters, temperature sensors and controllers, ignition coils, high-voltage packages, aquarium equipment, negative-ion generators, ultrasonic atomizers and general PCB encapsulation.

A: Mix Component A and Component B at 5:1 by weight (not by volume). Pot life is 2-3 hours for a 100 g mix at 25 C. Tack-free time is 6-8 hours at 25 C and full cure is 12-16 hours at 25 C, or 1.5-2 hours at 60-80 C for heat-accelerated cure.

A: Cured HN-5508A/B reaches Shore D 85-95, dielectric strength 20-22 kV/mm, tensile strength 16-18 kg/cm2, compressive strength 18-22 kg/cm2, shrinkage 0.35-0.55%, water absorption below 0.03%, heat distortion temperature 130-150 C and low-temperature resistance to -30 C, with good acid/alkali resistance and moisture proofing.

A: The low-viscosity formula and 2-3 hour pot life allow slow pouring into narrow clearances. Mix with a flat-bladed tool or small mixer, scrape the container walls and bottom, and degas under vacuum for void-sensitive parts. Keep the work area dust-free and pour within the pot life.

A: MOQ is 1 kg. Standard packaging is a 30 kg set (Component A 25 kg plastic barrel + Component B 5 kg plastic pot). Shelf life is 6 months when stored below 25 C in sealed containers. The product is RoHS compliant, classified as non-dangerous goods for transport, and OEM/private label and free samples are available. Contact us for a quotation.