Fluoropolymers Dispersion

Get to Know PFA Dispersion

Everflon™ PFA D450 is an off-white aqueous perfluoroalkoxy (PFA) dispersion stabilized with a non-ionic surfactant. It is a general-purpose dispersion that can be used to impart some of the unique properties of PFA to end products that would be difficult to make using traditional melt extrusion processes. It can be used to coat or impregnate porous structures or to make thin films. It can be coated and melt bonded to polytetrafluoroethylene (PTFE) resin or used as a hot melt adhesive. The PFA resin in Everflon™ PFA D450 is a melt flowable thermoplastic, providing superior properties typical of fluoroplastic resins: retention of properties after service at 260 °C (500 °F) and useful properties at –240 °C (–400 °).

Typical Applications

•Heat-sealable top coatings for PTFE-coated fabrics for belting, circuit boards, architectural fabrics, and electrical insulation

•Cast film for capacitor dielectrics or chemical barriers

•Hot melt adhesive for PTFE, PFA, and FEP parts

•Metal coatings

Processing Guide

Conventional coating techniques, such as dip, spray, spin, or roller coating, can be used for coating or impregnating high temperature materials with Everflon™ PFA D450. Thin coats, usually less than 5 μm (0.2 mil), are applied to prevent mud cracking as the coating dries. The water is normally removed at 120 °C [250 °F], followed by heating to remove the wetting agent (typically at 250–270 °C [482–518 °F]). Final consolidation is done above the 305 °C (581 °F) melt point. If the Everflon™ PFA D450 is being used as a top coat over a PTFE coated fabric or other parts, the coating must be heated to melt the PTFE (approximately 337 °C [639 °F]) to maximize adhesion. Prolonged heating above 370 °C (698 °F) should be avoided, as this could lead to thermal degradation of the Everflon™ PFA D450 polymer.

Other solid or liquid ingredients can be added to Everflon™ PFA D450 to provide specific processing or finished product behavior.

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.

Property	Test Method	Unit	Typical Value
Particle Size	ASTM D4441	μm	0.25
Solids Content	ASTM D4441	%	50
PH	ASTM D4441		9
Brookfield Viscosity	ASTM D2196	Mpa.s	15~30
Melt Flow Rate	ASTM D3307	g/10 min 5kg	8~12
Melting Point	ASTM D3307	°C	310