Multicore PTFE and FEP Fluoroplastic Control Cable — UL 1659 / UL 1332
Multicore fluoroplastic control cable combines the exceptional chemical resistance and high-temperature performance of PTFE or FEP insulation in a multi-core cable construction for control wiring in chemical processing equipment, laboratory analytical instruments, semiconductor manufacturing systems, and high-purity process installations where standard polymer-insulated control cables cannot withstand the combination of chemical exposure and elevated operating temperature.
PTFE-insulated cores under UL AWM Style 1659 (rated 250°C and 600V) provide the highest temperature rating and broadest chemical resistance of any extruded polymer insulation — resisting virtually every acid, alkali, solvent, and industrial chemical at operating temperature. FEP-insulated cores under UL AWM Style 1332 (rated 200°C and 300V) offer a smoother surface finish and more flexible construction than PTFE at a slightly lower maximum temperature, making FEP the preferred choice where cable routing flexibility and pull-through ease are priorities. Both styles are manufactured under UL Follow-Up Service and carry the UL Recognized Component Mark.
Technical Specifications — UL 1659 PTFE vs UL 1332 FEP
| Parameter | PTFE — UL Style 1659 | FEP — UL Style 1332 |
|---|---|---|
| Insulation Material | Extruded PTFE (TFE) | Extruded FEP |
| Temperature Rating | 250°C continuous | 200°C continuous |
| Voltage Rating | 600 Vac | 300 Vac |
| UL AWM Style | 1659 | 1332 |
| Insulation Thickness | 20 mils min avg (26–10 AWG) | 13 mils min avg |
| Conductor | Tinned or silver-plated copper | Tinned copper |
| AWG Range | 26 AWG – 10 AWG | 26 AWG – 16 AWG |
| Core Counts | 2 / 3 / 4 / 5 / 6 / 8 / 10 / 12 cores | 2 / 3 / 4 / 5 / 6 / 8 cores |
| Optional Shield | Tinned copper braid or Al foil + drain wire | Tinned copper braid or Al foil + drain wire |
| Surface Finish | Matte — slightly higher friction | Smooth, glossy — low friction |
| Chemical Resistance | Broadest — resists virtually all industrial chemicals | Excellent |
| UL Recognition | UL Recognized Component — file on record | UL Recognized Component — file on record |
| MOQ | 100 meters / samples from 5 meters | 100 meters / samples from 5 meters |
Selecting PTFE vs FEP — Decision Guide
The selection between UL 1659 PTFE and UL 1332 FEP depends on three parameters: maximum operating temperature, voltage rating, and surface finish priority.
- Choose UL 1659 PTFE when wire surface temperature exceeds 200°C, when 600V insulation is required, when broadest chemical resistance is needed, or when silver-plated conductor is specified for high-frequency signal circuits.
- Choose UL 1332 FEP when maximum temperature is 200°C or below, when 300V insulation is adequate, when smooth glossy surface finish is preferred for cleanroom or semiconductor applications, or when superior routing flexibility compared to PTFE is a design priority.
Application Categories
Chemical Processing Control Wiring
Multi-core fluoroplastic control cable is the standard specification for instrument cable runs in chemical plant where the cable route passes through areas with acid vapour, solvent exposure, or corrosive process gas — environments that degrade PVC jackets within months but leave fluoroplastic insulation completely unaffected over decades of service.
Laboratory Analytical Instruments
Used for inter-module signal and power wiring in gas chromatographs, mass spectrometers, HPLC systems, and thermal analysis equipment where the cable must withstand the combined chemical and thermal environment of the instrument oven while maintaining signal integrity on sensitive measurement circuits.
Semiconductor Manufacturing Equipment
Specified for wiring inside diffusion furnaces, CVD reactors, and plasma etching equipment where contamination from cable decomposition products would damage wafers and the cable must withstand both the elevated process temperature and the corrosive process gas environment. UL 1332 FEP’s smooth non-contaminating surface is preferred in ultra-high-purity semiconductor process environments.
Other Applications
- Aerospace and defence wiring harnesses — PTFE UL 1659 compatible with MIL-spec environments
- Medical device internal wiring requiring sterilisation chemical resistance
- Offshore and subsea control cable in corrosive marine environments
- Industrial furnace and kiln instrumentation wiring
Related UL Styles for Comparison
Multicore PTFE FEP buyers commonly cross-reference: UL 1659 (250°C / 600V PTFE single conductor, for single-core applications in the same high-temperature chemical-resistant category), UL 1332 (200°C / 300V FEP single conductor, for single-core FEP applications), UL 10362 (250°C / 600V PFA, melt-extruded fluoropolymer with superior surface smoothness for ultra-high-purity applications), and UL 3135 (200°C / 600V silicone rubber, flexible high-temperature alternative where chemical resistance is not the primary requirement).
Request a Quote
Submit your insulation type (PTFE or FEP), AWG, core count, shield requirement, length, and annual volume estimate below. Silver-plated conductor available for PTFE version. Our team responds within 24 business hours. Sample lengths from 5 meters available upon request.
