When precision, durability, and signal integrity are non-negotiable, FEP coaxial cables deliver unmatched performance.
FEP (Fluorinated Ethylene Propylene) is a high-performance fluoropolymer insulation known for its excellent dielectric properties, heat resistance, and chemical stability — making it the ideal material for high-frequency and harsh-environment applications.
FEP Coaxial Cables
From aerospace systems to RF testing laboratories, FEP-insulated coaxial cables provide reliable signal transmission even under high temperature, humidity, or corrosive conditions.
What Is an FEP Coaxial Cable?
An FEP coaxial cable is a radio-frequency transmission line in which the dielectric and/or jacket material is made from FEP (Fluorinated Ethylene Propylene).
FEP insulation provides stable electrical performance across a wide frequency range and environmental conditions. Unlike standard PVC or polyethylene materials, FEP maintains low dielectric constant and loss tangent, ensuring minimal signal attenuation and consistent impedance.
Typical Construction
Center Conductor: Silver-plated or tinned copper wire
Dielectric: FEP fluoropolymer insulation
Shielding: Single or double braid of tinned or silver-plated copper
Jacket: FEP outer jacket for enhanced mechanical and chemical protection
Key Features and Advantages
FEP coaxial cables outperform conventional cables in demanding RF, microwave, and high-temperature environments.
🔥 High Temperature Resistance: Operates from –70°C up to +200°C
⚡ Excellent Electrical Stability: Low dielectric loss and consistent impedance
🧪 Chemical & Moisture Resistance: Impervious to oils, fuels, acids, and solvents
📶 Low Signal Loss: Ensures accurate signal transmission at high frequencies
🧯 Flame Retardant & Non-Aging: FEP does not degrade or emit toxic fumes under heat
💪 Mechanical Strength: Withstands flexing, abrasion, and pressure
Applications of FEP Coaxial Cables
FEP coaxial cables are used in high-performance and mission-critical systems where signal reliability and environmental resistance are essential.
🚀 Aerospace and Defense: Radar, telemetry, avionics, and missile systems
⚡ RF & Microwave Communications: Antennas, base stations, and test equipment
🧬 Medical Equipment: MRI systems, diagnostic imaging, and sterilizable instruments
🔬 Instrumentation and Sensors: Precision measurement and control systems
🏭 Industrial Automation: Process control and high-frequency signal transmission
Typical Specifications
| Property | Specification |
|---|---|
| Conductor Material | Silver-plated or tinned copper |
| Dielectric Material | FEP fluoropolymer |
| Jacket Material | FEP |
| Temperature Range | –70°C to +200°C |
| Characteristic Impedance | 50 Ω or 75 Ω |
| Dielectric Constant | ~2.1 |
| Voltage Rating | 300V – 1000V |
| Flame Rating | UL 94 V-0, VW-1 |
| Frequency Range | Up to 18 GHz (depending on type) |
FEP vs PTFE Coaxial Cables
Both FEP and PTFE are fluoropolymer materials with excellent dielectric performance, but they differ in flexibility and cost.
| Property | FEP Coaxial Cable | PTFE Coaxial Cable |
|---|---|---|
| Temperature Range | –70°C to +200°C | –70°C to +260°C |
| Flexibility | Higher | Moderate |
| Dielectric Constant | 2.1 | 2.1 |
| Flame Resistance | Excellent | Excellent |
| Chemical Resistance | Excellent | Excellent |
| Cost | Lower | Higher |
Summary:
If your application requires flexibility, chemical resistance, and cost efficiency, FEP coaxial cables are the optimal choice. For ultra-high temperature or space-rated systems, PTFE may be preferred.
Why Choose FEP Coaxial Cables?
FEP coaxial cables strike the perfect balance between performance and durability, making them suitable for both commercial and defense-grade applications.
Their ability to maintain signal integrity in extreme environments ensures reliable data and RF performance where standard cables fail.
TOT Wire & Cable offers a full range of FEP-insulated coaxial cables in both 50-ohm and 75-ohm configurations, customizable to your frequency, temperature, and environmental requirements.
Conclusion
FEP coaxial cables combine the electrical precision of fluoropolymer insulation with the mechanical strength needed for challenging environments. Whether for aerospace communication, RF testing, or industrial control, these cables deliver superior reliability and long service life.
👉 Contact TOT Wire & Cable today to get a quote for FEP coaxial cables or request a custom specification to match your application needs.
