Why Choose Spec 55 (Raychem) and M22759 Wires for Aerospace Wire Harnesses?
Spec 55 and M22759 Wires for Aerospace Harnesses
Wire selection is fundamental to harness reliability in aerospace applications. Spec 55 (Raychem) and MIL-W-22759 wires represent the industry standard for high-performance aerospace wiring.
Spec 55 (Raychem) Wire
Spec 55 wire, originally developed by Raychem (now TE Connectivity), features radiation-crosslinked polyalkene insulation that provides exceptional performance in demanding environments.
- Temperature Rating: -65°C to +150°C continuous operation
- Insulation: Radiation-crosslinked polyalkene, providing excellent cut-through resistance and mechanical durability
- Weight Savings: Up to 25% lighter than equivalent PTFE-insulated wires, contributing to significant aircraft weight reduction
- Flexibility: Superior flexibility for tight-radius routing in confined airframe spaces
- Arc Tracking Resistance: Excellent resistance to arc tracking, a critical safety factor in aerospace wiring
MIL-W-22759 Wire
MIL-DTL-22759 covers fluoropolymer-insulated wires used in high-temperature aerospace applications.
- Temperature Rating: -65°C to +200°C (Type III/IV with ETFE insulation)
- Insulation Options: PTFE (Types I/II), ETFE (Types III/IV), and modified ETFE for enhanced performance
- Chemical Resistance: Outstanding resistance to fuels, hydraulic fluids, solvents, and de-icing agents
- Flame Retardancy: Self-extinguishing insulation meets stringent flammability requirements
Selection Guidance
Use Spec 55 wire for general airframe wiring where weight savings and flexibility are priorities. Use M22759 wire for high-temperature zones (engine nacelles, APU bays) and areas exposed to aggressive chemicals. Raineon wire harness fabrication services include expert wire selection guidance based on your specific application environment.
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