Extruded Plastic Insulation
Extruded plastic insulations usually create more build to the Litz conductor, but have higher dielectric strength and can be extruded in a range of wall thicknesses to meet a wider range of voltage requirements.
Extruded Litz constructions can also provide the opportunity to interweave the primary and secondary windings and can therefore reduce the overall winding size. In addition, extruded plastic insulations tend to be more rugged and chemically resistant, and can withstand higher temperatures.
| Extruded Insulation | Maximum Temperature | Common Use | Advantages |
|---|---|---|---|
| ETFE | 155° C | Thin wall winding wire Primary in multi-conductor High frequency interconnect | Good winding characteristics Better at tight bend than other fluoropolymers Excellent heat resistance Excellent water/chemical resistance |
| FEP | 200° C | Thin wall winding wire Primary in multi-conductor High frequency interconnect | Excellent heat resistance Outstanding water/chemical resistance Outstanding flame retardancy Low outgas |
| PFA | 250° C | Thin wall winding wire Primary in multi-conductor High frequency interconnect | Excellent heat resistance Outstanding water/chemical resistance Outstanding flame retardancy Low outgas |
| PEEK/PAEK | 260° C | Winding wire High frequency interconnect | Excellent dielectric properties, including PD resistance Excellent chemical & abrasion resistance Halogen free |
| PE/PP | 75° C | Litz coax/twinax | Very good dielectric properties Outstanding water resistance |
| PVC | 105° C | Winding wire Primary in multi-conductor High frequency interconnect | Cost effective Excellent flame resistance Excellent flexibility Medical grades available |
| Polyurethane | 90° C – 105° C | High frequency interconnect | Excellent abrasion resistance Very good flexibility Can be coiled Halogen free |
| Polyester | 90° C – 125° C | Thin wall winding wire High frequency interconnect | Excellent abrasion resistance Excellent flex-life characteristics Can be coiled Halogen free |
| TPE | 90° C – 125° C | High frequency interconnect | Highly flexible grades available Medical grades available Lightweight grades available Halogen free and flame-retardant grades available |
| Silicone | 200° C | High frequency interconnect High voltage interconnect | Outstanding flexibility Outstanding heat resistance Medical grades available Can be coiled |
