FEP vs ETFE: Wire & Cable Insulation Comparison
Published: 2026-06-02
FEP: superior electrical properties (dielectric constant 2.0 vs 2.6), preferred for data cables and medical wiring. ETFE: 2× tensile strength, better abrasion, preferred for aerospace (MIL-W-22759) and automotive.
FEP: superior electrical properties (dielectric constant 2.0 vs 2.6), preferred for data cables and medical wiring. ETFE: 2× tensile strength, better abrasion, preferred for aerospace (MIL-W-22759) and automotive.
Comparison at a Glance
| Tensile Strength | FEP:23 vs ETFE:45 MPa |
|---|---|
| Melting Point | FEP:260 vs ETFE:267°C |
| Shrinkage Rate | FEP:3-4 vs ETFE:2-3% |
| Flexural Modulus | FEP:0.5 vs ETFE:1.4 GPa |
| Hdt | FEP:70 vs ETFE:105°C |
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Teflon FEP vs Tefzel ETFE |
Frequently Asked Questions
FEP or ETFE for aerospace?
ETFE (Tefzel) per MIL-W-22759. Survives 200°C and wire bundle abrasion. FEP for medical sensor cables where electrical properties matter more than mechanical durability.
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org