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Kel-F® (PolyChloroTriFluoroEthylene) is a fluorocarbon based polymer and is frequently abbreviated as PCTFE. PCTFE combines physical and mechanical properties, non-flammability, chemical resistance, near zero moisture absorption and excellent electrical properties not found in any other thermoplastic fluropolymer.
Kel-F® also known as PCTFE or CTFE has many of the properties similar to other fluoropolymers such as PTFE, FEP, or PFA, but is mechanically superior in rigidity and has very low gas permeability.
Kel-F® maintains an outstanding electrical-insulating capability through thermal cycling and in high humidity environments. This material's high compressive strength and dimensional stability make it a good choice for structural material, while its low outgassing rate and permeability make PCTFE a great choice for laboratory, aerospace, flight applications, and instrumentation.
Please Note: The Kel-F® brand belongs to 3M, but their production was discontinued in 1995. The only remaining resin is made by Daikin Industries of Japan and called Neoflon®.
PCTFE is a homopolymer of chlorotrifluoroethylene. PCTFE is melt processible and can be extruded or molded. PCTFE has a number of unique properties. In addition to excellent thermal and chemical stability, it has very low moisture absorption and permeation. It also is highly resistant to cold flow, is very rigid, is tough, has excellent dimensional stability and extremely good low temperature properties. It is especially applicable as a valve component material in cryogenic fluid service.PCTFE Main Advantage:
- Especially suitable for cryogenic applications
- Excellent resistance to creep
- Dimensionally stable over a wide temperature range
- Extremely low gas permeability
- FDA approval
- Transparent and coloured compounds
- Working temperature from -240°C to +180˚C
- PCTFE - Poly (chloro trifluoro ethylene) TYPICAL PROPERTIES
PCTFE - Poly (chloro trifluoro ethylene) TYPICAL PROPERTIES
Property Value Units Method MECHANICAL PROPERTIES Tensile Strength 4860 - 5710
34 - 39psi
MPaD 638 Elongation 100 - 250 % D 638 Flexural Strength, 73°F 9570 - 10300
66 - 71psi
MPaFlex Modulus 200 - 243 x 103
1.4 - 1.7psi
MPaImpact Strength, Izod, 23 deg C 2.5 - 3.5 ft-lb/in D 256 Compressive Stress at 1% deformation, 1570 - 1860
11 - 13psi
MPaD 695 Density 2.10 to 2.17 gm/cu.cm THERMAL PROPERTIES Coefficient of Linear Expansion 7 x 10-5 K-1 Melting Point 410 -414
210 - 212deg F
deg CThermal Conductivity 1.45
0.84Btu·in/h·ft2·°F
W/m·KASTM C 177 Specific Heat 0.22
0.92Btu/lb/deg F
kJ/Kg/deg KHeat Distortion Temperature, 66 lb/sq.in (0.455 MPa) 259
126deg F
deg CD 648 Processing Temperature 620
327deg F
deg CELECTRICAL PROPERTIES Dielectric Strength, short time, 0.004" 3000 Volt/mil D 149 Arc-Resistance 360 sec D 495 Volume Resistivity, @ 50% RH 2 x 1017 ohm-cm D 257 Surface Resistivity, @ 100% RH 1 x 1015 Ohm sq-1 D 257 Dielectric Constant, 1 kHz 2.6 ε D150-81 Dissipation Factor, @ 1 kHz 0.02 D150-81 OTHER PROPERTIES Water Absorption 0.00 % increase in weight D570-81 Flame Rating+ Non-flammable D 635 Coefficient of friction D 1894 Specific Gravity 2.10 to 2.17 D792 Moisture Permeability Constant 0.2 g/m, 24 hours O2 Permeability 1.5 x 10-10 Cc, cm/sq.cm, sec, atm N2 Permeability 0.18 x 10-10 Cc, cm/sq.cm, sec, atm CO2 Permeability 2.9 x 10-10 Cc, cm/sq.cm, sec, atm H2 Permeability 56.4 x 10-10 Cc, cm/sq.cm, sec, atm + Numerical rating for flame spread is not intended to reflect hazards presented by this or any other material under actual fire conditions
| Material | Brand | Size (Rod) | Services | Application |
| PCTFE | MBH | Dia. 4 /5/6/7/8/9/10/13/16/18/22/ 25/26/40/45/50/55/ | sheet/rod extrusion and machining and plastic modified services | medical, pharmaceutical, and semi-conductor, Aerospace, Auto etc. |
