Latest company case about Shenzhen Hanast New Material co.,LTD Certifications

A European manufacturer of automotive and industrial relays needed a dependable encapsulation solution for its 12 V and 24 V power relays used in engine control units (ECUs), electric window modules, and industrial control panels. These relays operate under continuous vibration, wide temperature swings from −30 °C to 130 °C, and long-term exposure to humidity, salt spray, and automotive fluids. Field returns showed that moisture ingress and silver-contact corrosion were the leading causes of premature relay failure. The customer therefore required a potting compound that could extend service life, secure the internal components, and comply with the EU RoHS Directive.

• Prevent moisture, dust, and corrosive media from reaching the relay coil and contacts
• Maintain high dielectric insulation to avoid short circuits and arcing across terminals
• Withstand repeated thermal cycling without cracking or delamination
• Penetrate the narrow internal gaps of the relay housing in a single pour
• Support high-volume, automated production while remaining RoHS compliant

After evaluating several candidates, the customer selected HN-5508A/B, a general-purpose two-component epoxy potting compound with a 5:1 mix ratio by weight. Its low viscosity and long pot life of 2–3 hours at 25 °C let operators pot batches of relays in sequence without premature gelation, while the excellent flowability ensures complete penetration into the narrow winding and terminal cavities. The material cures at room temperature in 12–16 hours or can be accelerated at 60–80 °C for 1.5–2 hours, giving the factory flexible scheduling options.

1. Pre-mix Component A thoroughly; warm gently if crystallization occurs.
2. Weigh Components A and B at a 5:1 ratio by weight.
3. Mix with a flat-bladed tool, scraping the container walls and bottom.
4. Degas under vacuum for void-sensitive relays (optional).
5. Pour the compound into the clean, dry relay housing within the pot life.
6. Cure at room temperature or accelerate at 60–80 °C, then inspect.

• Moisture-related returns dropped by more than 70 % in the first year after switching to HN-5508A/B.
• Dielectric withstand testing passed at 20–22 kV/mm with no arcing across terminals.
• Thermal cycling from −30 °C to 130 °C showed no cracking, delamination, or bubble formation.
• A bubble-free, glossy surface improved the appearance and traceability of the finished relays.

HN-5508A/B proved to be a cost-effective, RoHS-compliant potting solution for automotive and industrial relays. Its combination of low viscosity, high dielectric strength, and mechanical hardness protects delicate relay components from moisture, vibration, and heat, delivering a measurable improvement in field reliability and customer satisfaction.