Electrical Insulator Plastic Components & Dielectric Parts
Electrical applications specify plastic components for one primary reason beyond corrosion resistance: dielectric insulation. Machined plastic parts in electrical enclosures, switchgear, terminal assemblies, and bus bar systems provide the electrical isolation that prevents fault conditions in high-voltage and high-current equipment. Pepco Plastics machines electrical insulator plastic components and dielectric parts from our Alberta facility for electrical OEMs and industrial electrical applications across Western Canada.
Where metal conducts and creates a fault path, engineered plastic insulates and holds its dimensions.
How Electrical Applications Use Engineered Plastics
Engineered plastic insulator components appear throughout the electrical industry — from low-voltage control panels to medium-voltage switchgear and high-current bus bar installations.
Bus bar support insulators and standoffs
Electrical bus bar systems require insulating supports and standoffs that hold the bus bar in position while maintaining electrical isolation from the enclosure structure. Machined Delrin and UHMW supports are specified for their dimensional stability under load and their dielectric properties across the voltage range typical of industrial bus bar applications.
Terminal blocks and connector components
Terminal block bodies, connector housings, and insulating spacers are machined from Delrin for tight dimensional tolerances, electrical insulation, and the ability to be threaded and tapped for terminal hardware.
Switchgear insulating components
Medium-voltage switchgear uses machined plastic insulating components — arc chutes, interphase barriers, and insulator supports — where dimensional accuracy and consistent dielectric properties are required across operating temperature ranges.
Control panel components
Insulating panels, DIN rail bases, equipment mounting pads, and separation components in control panel assemblies use machined plastic where the combination of electrical isolation and dimensional accuracy are both required.
Electrical equipment wear and structural components
Beyond pure insulation, electrical equipment housings and structural components are machined from engineering plastics where corrosion resistance, weight, and the elimination of conductive fault paths are design requirements.
Recommended Materials for Electrical Applications
Delrin (acetal)
Delrin is the primary specification for precision electrical insulator components. Delrin's dielectric strength (~500 V/mil), dimensional stability, and excellent machinability make it the right material for terminal bodies, connector components, switchgear insulators, and any electrical application requiring tight tolerances and consistent electrical properties. Delrin machines cleanly to the fine threads and close tolerances that electrical hardware requires.
UHMW plastic
UHMW is specified for electrical applications requiring insulation combined with impact toughness and abrasion resistance — equipment guards in electrical environments, cable protection components, and structural components in electrical infrastructure where the combination of non-conductivity and toughness is the design driver.
Advantages of Pepco Plastics
Our customers typically machine or cut the products we sell or products for their own use or for resale. Pepco Plastics Ltd. manufactures and supplies state of the art materials providing our customers with solutions to eliminate shock, wear, vibration, and impact for the following applications:
- Wide temperature range from -80 to 800 Fahrenheit (-62 to 427 Celsius)
- Resistant to corrosion and most oils, greases, and solvents
- Excellent electrical insulation
- Excellent abrasion resistance
- Excellent impact strength
- Excellent resilience, toughness, and cut resistance
- Excellent sound dampening qualities
- Low coefficient of friction
Why Choose Pepco?
At Pepco Plastics, we combine decades of hands-on experience with rigorous quality control to deliver custom plastic parts you can rely on. Our in-house facility in Nisku, Alberta is equipped with the machinery, testing equipment, and skilled team needed to meet your exact specifications, every time. Here's what sets us apart:
Pepco's Capability in Electrical
Pepco machines electrical insulator components from our Alberta facility through our CNC plastic machining capability. Electrical applications frequently require precise threading, tight dimensional tolerances, and consistent material properties across a production run — the combination of requirements that Delrin's machinability and dimensional stability is designed for.
Pepco produces both one-off prototype insulator components for equipment development and production runs for OEM electrical equipment manufacturers. Custom machined insulator components from drawings are standard work. For electrical applications requiring specific dielectric strength documentation or material certificates, these are available on request — specify the requirement at inquiry.
