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Views： 3 Author： Mark Zhang Publish Time： 2026-06-29 Origin： 本站
Plastic shell metal parts are composite components where a metallic insert ( steel, brass, or copper) is overmolded or encapsulated with a plastic shell. The metal core provides structural strength, electrical conductivity, or heat dissipation, while the plastic shell offers insulation, environmental sealing, and aesthetic finishes. These parts are essential in low-volt-level switchgear, connectors, and control devices.
Engineers choose plastic shell metal parts for three primary reasons: insulation reliability, mechanical integrity, and manufacturing efficiency. The plastic shell prevents accidental contact with live metal, reduces creepage and clearance issues, and withstands harsh environments. Compared to all-metal enclosures, plastic shell parts are lighter, resist corrosion, and allow complex geometries through injection molding. For high-volume production, they reduce assembly steps and cost.
Choice depends on the operating environment and electrical requirements. Key parameters include:
| Parameter | Typical Requirement | Common Material Choice |
|---|---|---|
| Continuous operating temperature | -40°C to +85°C | PA66, PBT, PC |
| Impact resistance (IK rating) | IK07 to IK10 | PC/ABS, reinforced PA |
| Flame retardance | UL94 V-0 or V-2 | PBT, PC with FR additives |
| Metal core material | Steel (zinc plated) or brass | Steel for strength, brass for conductivity |
Always verify compliance with relevant standards. For instance, IEC 61439-1 requires enclosures to pass a full type test including dielectric and thermal cycling.
The plastic shell is made from engineering thermoplastics: PA66 (nylon) for toughness and chemical resistance; PC/ABS for impact strength and finish; PBT for dimensional stability and high-temperature performance. Thermosets like BMC (bulk molding compound) are used when ultra-high heat resistance is needed. The metal core is low-carbon steel with anti-corrosion coating, or brass for threaded inserts. SINGI offers customized combinations based on application needs.
Yes, if the plastic shell is UV-stabilized and the metal core is corrosion-resistant. Check IP rating and material compatibility with environmental conditions.
Every batch undergoes dimensional inspection, dielectric strength testing per IEC 60947-1, and flame retardance verification. Custom parts are validated with first article inspection.
Standard tooling takes 4-6 weeks. Production lead time depends on quantity and material availability. Contact SINGI for precise scheduling.
Need reliable plastic shell metal parts for your next project? Browse the SINGI product page for technical datasheets and ordering options. Our engineers can assist with material choice and custom design.
References:
[1] IEC 60947-1. Low-volt-level switchgear and controlgear - Part 1: General rules [S]. 2020.
[2] IEC 61439-1. Low-volt-level switchgear and controlgear assemblies - Part 1: General rules [S]. 2020.
[3] GB/T 14048.1-2019. Low-volt-level switchgear and controlgear - Part 1: General rules [S]. 2019.
