PolyCloroTriFluoroEthylene (PCTFE) is a melt-processable homopolymer in which one fluorine atom of the PTFE structure is substituted by a chlorine atom.  This atom replacement gives some advantages to PCTFE such as transparency, lower gas permeability, and higher mechanical strength to the detriment of a higher coefficient of friction over PTFE.

The amount of crystallinity of PTCFE may be controlled by its thermal history, especially the cooling speed during processing. High crystalline PCTFE is denser and has high mechanical strength and low elongation, whereas low crystalline PCTFE has a lower density, is more elastic, and optically clear. Our PB23000 materials meet the requirements of ASTM D1430.

PBY Material Codes:

PB23000-LC - PCTFE Low Crystallinity

PB23000D-HC - PCTFE High Crystallinity

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PCTFE Properties

  • Cold Flow Resistant

  • Very low outgassing and permeation

  • Zero moisture absorption

  • Excellent chemical resistance

  • Radiation Resistance

  • Common Brands: Neoflon® Kel-F® Aclon®

Typical Applications

  • Chemical Processing Components

  • Cryogenic Components

  • Gaskets and Seals

  • Aerospace pump parts, valve seats, impellers

  • Lab instruments

  • Nuclear Service components and high radiation exposure components

  • Liquid oxygen and liquid nitrogen valve linings


This product meets ASTM D1430 Group 1 Class 1 Grade 3, AMS 3645 and 3650 requirements


PB23000-LC PB23000D-HC - Material Data Sheet

Spec. Summary
Property Test Method Units Typical Values
Color - - Translucent to White
Specific Gravity ASTM D792 - 2.100 - 2.150
Hardness Shore D ASTM D2240 - 76 - 86
Tensile Strength, min. ASTM D638 PSI [MPa] 5,000 [34.5]
Elongation at Break, min. ASTM D638 % 100
Tensile Modulus, min. ASTM D638 PSI [MPa] 171,000 [1179]
Service Temperature High - °F [°C] 356 [180]
Service Temperature Low - °F [°C] -427 [-255]
Second Melt Peak Temp. ASTM D3418 °F [°C] 413 [212]
Glass Transition Temp. ASTM D3418 °F [°C] 113 [45]

Spec. Compliance

AMS 3650
AMS 3645
ASTM D1430 G1 C1 G3


  • Wypych, George. Handbook of Polymers. 2nd Ed., ChemTec/Publishing, 2016.
  • Ebnesjjad, Sina. Fluoroplastics Vol1 & Vol2. 2nd Ed., Elsevier Inc., 2015.
  • Aerospace Materials Specifications for PTFE materials (AMS3678)
  • American Society for Testing and Materials (ASTM) Standards