Fluoroplastic PTFE Granular

Get to Know Everflon™ PTFE Granular M

Everflon™ PTFE M40/M90 is a white powder with a small particle size. Its small particle size helps to minimize voids, even at relatively low molding pressures. High bulk density increases the size of moldings possible from a given mold or press opening.

Everflon™ PTFE M40/M90 is preferred for large moldings requiring optimum mechani-cal and electrical properties.

Typical Applications

Chemical linings;
Electrical insulators;
Expansion bellows;
Diaphragms;
Bridge or pipeline bearing pads;
Gaskets;
Mechanical seals;
Piston rings

Processing Guide

Everflon™ PTFE M40/M90 usually is processed in two steps: preforming and sintering. The powder is first com-pacted 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 M40/M90 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.

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 M40/M90. The white resin and high sintering temperatures cause even small foreign particles to become visible in finished moldings. Keep resin drums closed and clean. Good housekeeping and careful handling are essential.

Property	Test Method	Unit	Typical Value
Particle Size	ASTM D4895	μm	40
Tensile Strength	ASTM D4895	Mpa	> 40
Elongation	ASTM D4895	%	> 370
Melting Point	ASTM D4895	°C	327