Fluoroplastic PTFE Granular

Get to Know PTFE Granular G

Everflon™ PTFE G is a free-flowing white powder composed of relatively large particles and ideal for isostatic molding. Its most unique features are improved moldability at lower pressure and im-proved surface smoothness of finished parts.

It offers an excellent combination of properties that are characteristic of Ever-flon™ fluoroplastic resins:

• Chemical inertness

• Exceptional dielectric properties

• Heat resistance

• Toughness and flexibility

• Low coefficient of friction

• Non-stick characteristics

• Negligible water absorption

• Excellent weather resistance

Everflon™ PTFE G is often preferred for molding thick sheets and is sometimes used for ram extrusion of rod and tubing with thicker cross-sections. Properly processed products made from neat Everflon™ PTFE G provide the superior properties typical of fluoroplastic resins.

Typical Applications

Valves

Lab ware

Expansion bellows

Ball valve seats

Ducting

Tubing Linings

Disc

Mechanical seals

Piston rings

Processing Guide

Everflon™ PTFE G usually is processed in two steps: preforming and sintering. The powder is first compacted into a preformed shape approximating that of the desired molding.

A precise heating (sintering) and cooling cycle is then used to consolidate the molding at temperatures above the crystalline melting point of the neat powder. The properties of a finished molding are dependent on perform pressure, sintering time and temperature, and cooling rate. Everflon™ PTFE G is used to make relatively large objects in molds that can be filled manually. Small particle resins do not flow properly in automatic feeding systems.

Precaution

Equipment used to process at melt temperatures should be provided with local exhaust ventilation (LEV) to completely 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 processing any fluoroplastics, read the Material Safety Data Sheet.

Data List

Property	Test Method	Unit	Typical Value
Particle Size	ASTM D4895	μm	500
Tensile Strength	ASTM D4895	Mpa	> 40
Elongation	ASTM D4895	%	> 330
Melting Point	ASTM D4895	°C	327

Handing & Package

Preforming is easiest when the resin is uniformly between 21–27 °C (70–80 °F). As temperatures decline below this range, the resin will be increasingly difficult to mold without cracks and problems with condensed moisture. Higher temperatures inhibit flow and promote lumping. Storage conditions should be set accordingly. Cleanli-ness is a critical\ requirement for successful use of Everflon™ PTFE G. The white resin and high sintering tempera-tures cause even small foreign particles to become visible in finished moldings. Keep resin drums closed and clean. Good housekeeping and careful handling are essential.

Everflon™ PTFE G is packaged in 25-kg drums. Each drum has a bag liner made of polyethylene resin. For ship-ping convenience, orders of 200-kg (8 drums/pallet) are recommended.

Academic Center

Thinking for You