Fluoroplastic FEP Resin

Get to Know FEP 4608

Everflon™ FEP 4608 is a melt-processible copolymer of tetrafluoroethylene and hexafluoropropylene, without additives, that meets the requirements of ASTM D 2116 Type I.

It offers the excellent combination of prop-erties characteristic of Everflon™ fluoro-plastic resins: non-aging characteristics, chemical inertness, exceptional dielectric properties, low flammability, heat resis-tance, toughness and flexibility, low coeffi-cient of friction, non-stick characteristics, negligible moisture absorption, and excel-lent weather resistance.

As an intermediate molecular weight resin, Everflon™ FEP 4608 offers higher process-ing speeds than many FEP grades with sim-ilar high level of stress crack resistance.

Stress crack resistance is an important element in establishing end-use performance. Extensive testing of wire and cable constructions is required for definitive performance evaluation. Expe-rience shows that the MIT folding endurance or flex life test, performed on a thin film of resin, has established a good correlation with extensive cable testing. The higher the MIT flex life, the higher the stress-crack resistance of the resin. MIT test results should be viewed as a guide to comparative performance of the various grades of resin. We recommend that for applications involving repeated thermal and flex cycling, specific tests on the final cable always should be undertaken.

Typical Applications

Typical Applications for Everflon™ FEP T4608 is insulation and jacket for wire and cable in applications demand-ing a high degree of stress crack resistance. Tubes and piping for general and chemical process industry.

Processing Guide

Everflon™ FEP fluoroplastic resin can be processed by conventional melt extrusion, and by injection, compression, and blow molding processes.

For smooth feeding to extrusion equipment, it is supplied in 3 mm (0.12 in) pellets.

The extruders and molding machines used for Everflon™ FEP should be constructed of high nickel alloy corrosion-resistant materials and be capable of operating at temperatures up to 400 °C (750 °F)

Precaution

Equipment used to process at melt temperatures should be provided with local exhaust ventilation (LEV) to com-pletely remove all fumes and vapors from the processing area. In addition, care should be exercised to avoid the contamination of cigarettes and other forms of smoking tobacco when using fluoroplastic resins. Before process-ing any fluoroplastics, read the Material Safety Data Sheet.

Data List

Property	Test Method	Unit	Typical Value
GENERAL
Specific Gravity	ASTM D792		2.15
Critical Shear Rate, 372 °C (702 °F)		1/s	12
Guide DDR Range for Cable Extrusion			3–8
Guide DDR Range for Jacket Extrusion			20–120
MECHANICAL
Impact Strength, Notched Izod, 23 °C (73 °F)	ASTM D256	kJ/m²	No Break
MIT Folding Endurance (0.20 mm, 8 mil film)	ASTM D2176	Cycles	500,000
Hardness Durometer	ISO 868 / ASTM D2240		D56
ELECTRICAL
Dielectric Strength, Short Time, 0.25 mm (0.010 in)	IEC 243 / ASTM D149	kV/mm	> 100
Relative Permittivity, 1 kHz	IEC 250 / ASTM D150		2.03
Relative Permittivity, 1 GHz	IEC 250 / ASTM D150		2.03
Dissipation Factor, tg δ, 1 kHz	ISO 1325 / ASTM D150		0.00005
Dissipation Factor, tg δ, 1 GHz	ISO 1325 / ASTM D150		0.0007
OTHER
Water Absorption, 24 hr	ASTM D570	%	<0.01
Weather and Chemical Resistance			Excellent
Limiting Oxygen Index	ISO 4589 / ASTM D2863	%	> 95
Continuous Service Temperature		°C (°F)	205 (400)
Flammability Classification	UL 94		V-0

Handing & Package

Everflon™ FEP is packaged in 25-kg, single layer, plastic bags. For convenient shipment, orders of 1000-kg gallary are recommended.

The properties of Everflon™ FEP resin are not affected by storage time. Ambient storage conditions should be designed to avoid airborne contamination and water condensation on the resin when it is removed from contain-ers.

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