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Lined valves and accessories use fluorocarbons such as PFA, PVDF, PTFE, PFA-AS (antistatic), as per customer request.

Fluorinated Ethylene Propylene (FEP) is a resin coating that has a very high chemical and temperature resistance. FEP is highly inert and will withstand exposure to most chemicals and solvents such as Acetic acid, Acetone, Alcohols, Ammonia, Aromatic solvents, Beer, Chlorine, Citric acid, Detergents, Diesel, Fluorinated refrigerants, Fruit juices, Glycols, Hydrogen Peroxide, Hydrochloric acid, Nitric acid, Petrol, Gasoline, Kerosene and Sulphuric acid.

FEP has a high melting point and can be used in environments as high as 200°C (392°F).

FEP is often specified for liquid level measurements applications such landfill leachate monintoring, fuel tank level and chemical storage tanks.

PerFluoroAlkoxy (PFA) offers similar properties to FEP, but is considered more of a premium resin. PFA is preferred when extended service is required in hostile environments involving chemical, thermal, and mechanical stress. PFA offers high melt strength, stability at high processing temperatures, excellent crack and stress resistance, a low coefficient of friction, and more than 10 times the Flex life of FEP.

It has high resistance to creep and retention of properties after service at 500°F (260°C), with useful properties at -320°F (95°C). PFA also meets FDA 21CFR.177.1550.

PFA is used in the same types of applications as those listed above for FEP.

PRODUCT FEATURE

  • Easy Maintanance
  • Very aggressive and corrosive media are safely shut-off and controlled
  • seals tightly at full differential pressure even with very high switching cycles and varying temperatures
  • Excellent bubble-tightness
  • Economic and easy assembly of all actuator types

TECHNICAL DESCRIPTION

Because of its molecular structure, traditional PTFE cannot be processed by melting, but must be compressed into shapes and heated under pressure (sintered). In contrast, FEP and PFA are melt-processable by conventional thermoplastic processing methods, including injection, transfer, blow, and compression molding and by extrusion.

FEP DESCRIPTION

TetraFluorEthylene-Perfluorpropylene (FEP) is produced by copolymerization of tetrafluoroethylene and hexafluoropropylene. It is a relatively soft thermoplastic with lower tensile strength, wear resistance, and creep resistance than many other engineering plastics. However, it is chemically inert and has a low dielectric constant over a wide frequency range. FEP possesses a very high degree of stress crack resistance, a low coefficient of friction, exceptional dielectric properties, heat resistance, retention of properties after service at 400°F (204°C) with useful properties at -454°F (-270°C), and meets FDA 21CFR.177.1550.

FEP has high transparency (with good transmittance of UltraViolet and visible wavelengths.) It has long term weather ability and excellent resistance to ozone, sunlight and weather. FEP offers the lowest refractive index of all thermoplastics with low light reflection (the same as water.)

Important applications are linings for pipe and chemical processing equipment, and numerous wire and cable applications.

PFA DESCRIPTION

PerFluoroAlkoxy (PFA) offers similar properties to FEP, but is considered more of a premium resin. PFA is preferred when extended service is required in hostile environments involving chemical, thermal, and mechanical stress. PFA offers high melt strength, stability at high processing temperatures, excellent crack and stress resistance, a low coefficient of friction, and more than 10 times the Flex life of FEP.

It has high resistance to creep and retention of properties after service at 500°F (260°C), with useful properties at -320°F (95°C). PFA also meets FDA 21CFR.177.1550.

PFA is used in the same types of applications as those listed above for FEP.

TYPICAL PROPERTIES OF SELECTED FLUOROPOLYMERS
ASTM or UL test Property PTFE
(unfilled)
FEP PFA
PHYSICAL
D792 Density (lb/in3)
(g/cm3)
0.078
2.16
0.078
2.15
0.078
2.15
D570 Water Absorption, 24 hrs (%) < 0.01 < 0.01 < 0.03
MECHANICAL
D638 Tensile Strength (psi) 3,900 3,400 3,600
D638 Tensile Elongation at Break (%) 300 325 300
D790 Flexural Strength (psi) No break No break No break
D2176 Folding Endurance (cycles) > 106 5-80 x 103 50-500 x 103
D790 Flexural Modulus (psi) 72,000 85,000 85,000
D785 Hardness, Shore D D50 D56 D60
D256 IZOD Notched Impact (ft-lb/in) 3.5 - -
THERMAL
D3418 Melting Temp (°F / °C) 635 / 335 500 / 260 582 / 305
- Max Operating Temp (°F / °C) 500 / 260 400 / 204 500 / 260
UL94 Flammability Rating V-0 V-0 V-0
ELECTRICAL
D150 Dielectric Constant at 1 MHz 2.1 2.1 2.1
D150 Dissipation Factor at 1 MHz < 0.0002 0.0007 0.0001
D495 Arc Resistance (sec) < 300 < 300 < 180
D257 Volume Resistivity (ohm-cm)at 50% RH > 1018 > 1018 > 1018
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