Plastics for Electrical Connectors & Relays
Connector housings, relay bases, terminal blocks and insulating brackets face one common set of demands:
high dielectric strength, precise dimensional stability, and ― in most regulated E&E products ― a UL94 V-2 or V-0 flammability rating. Material choice is usually between two engineering families: PA66, valued for its toughness, fatigue resistance and spring-back in snap-fit designs; and flame-retardant polycarbonate, chosen where thin-wall precision parts must pass V-0 while surviving handling and heat.
What to Check Before Sourcing Connector Resin
- Flammability class and the wall thickness at which it is certified (V-2/V-0 ratings are thickness-dependent).
- Dimensional stability and creep under terminal insertion forces.
- Comparative tracking index (CTI) and dielectric strength for insulation performance.
- Drying and processing window ― PA66 and PC are both moisture-sensitive before molding.
Selection Logic in 30 Seconds
– Small snap-fit parts with high cycle counts → PA66 (fatigue and elasticity).
– Thin-wall parts requiring V-0 compliance → flame-retardant PC.
– Service temperature above 120 °C or high stiffness needs → glass-reinforced PA66.
– Parts also exposed to flame plus heat/load → FR PC/ABS or reinforced FR grades.
FAQ
Q1: V-0 or V-2 for my connector?
A1: Match the rating to your end-product standard (IEC 60335, UL 94) and actual wall thickness ― our engineers confirm within 12 hours.
Q2: Can you source a grade not listed below?
A2: Yes ― our portfolio grows continuously; send the OEM number or specification and we will match it.
Q3: Do you provide samples?
A3: Yes, samples are available, but sample fees and shipping costs are to be borne by the customer.
Plastics for Connectors & Relays
| Brand | Grade | Applications |
|---|---|---|
| Ascend | 21SPC PA66 | Connector housings, switch parts, insulating brackets |
| Covestro | 6557 PC | Circuit-breaker housings, relay modules, terminal blocks, switch panels |
| SABIC | 945 PC | Injection molding of precision E&E components |
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