Fluoroplastic PTFE Free Flow

Get to Know Everflon™ PTFE Dispersion D60

Everflon™ PTFE D60 is a milky-white, water-based dispersion with a solids content of around 60% and the spherical hydrophobic polymer particles have an average size of around 210 nm. It is primarily used to coat glass cloth and other fabric structures. Due to its excellent wetting properties, multiple coatings are possible. It can even coat low energy substrates such as PTFE fabrics and other hard-to-wet substrates.

Everflon™ PTFE D60F is primarily used in glass cloth formulations and provides excellent non-stick properties. It is suitable for substrates such as glass and aramid fabrics that require good oil and grease resistance, such as for conveyor belts, baking foils, and architectural membranes.

Typical Applications

Coated woven fiberglass fabric used in architectural, industrial, food processing, and electronics applications;

Impregnated packing made from braided fibers for severe chemical and thermal service;

Cast film for capacitor dielectrics or chemical barriers;

Surface coatings for metallic or other high-temperature substrates;

Anti-drip additive for plastics;

Binder for battery anode or cathode materials;

Formulated surface non-stick coating;

Formulated primer not-stick coating

Processing Guide

Conventional dip or flow techniques can be used for coating or impregnating high temperature fabrics, fibers, and other products with Everflon™ PTFE D60. A continuous PTFE resin coating on woven fabrics made of fiberglass, aramid fiber, or other high temperature-resistant fibers can be made by dip coating. Multiple passes may be used to build the desired thickness to produce a smooth, crack-free coating.

Everflon™ PTFE D60 is formulated to provide good rewetting on each pass. Each coating layer is usually dried to remove water (typically at 120 °C [250 °F]), baked to remove the wetting agent (typically at 270 °C [518 °F]), sometimes calendered, and finally heated above the crystalline melting point of the resin particles (approximately 337 °C [639 °F]).

Products utilizing entrained PTFE resin particles only for their lubricating or hydrophobic properties are dried and baked, but not heated above the crystalline melting point of the particles. For example, rope-like products, such as shaft packings, can be made from braided yarn in a variety of cross sections. The dispersion wets internal surfaces and promotes penetration of the small PTFE particles. The unmelted particles are sheared and retained as an impregnant, even when compressed in service and exposed to steam or chemicals.

The details please visit www.everflon.com or refer Everflon™ Fluoropolymer Dispersions Application Guide.

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

Ammonium hydroxide is used by Everflon™ Dispersion to set the pH to 9.5–11.0 at the time of shipment. High ambient temperatures can deplete the ammonium hydroxide level and reduce pH.

Declining pH eventually favors bacterial growth, which causes odor and scum. The pH of opened containers should be measured and maintained between 9.5 and 11.0.

High-speed stirring, pumping, or any other violent agitation must be avoided to minimize sheared particles, coagulation, and foaming. Ideally, the dispersion should be conveyed by gravity from storage to processing stations.

Everflon™ PTFE D60 must be properly stored to maximize the stability of the dispersion. The PTFE particles will settle on prolonged standing and/or on prolonged heating— temperatures above 40 °C (104 °F) should be avoided.

The dispersion must be protected from freezing, which will cause irreversible settling. The optimum storage temperature range is 7–24 °C (45–75 °F). If dispersions are to be stored for extended periods, lower-temperature storage is desirable.

For optimal performance, Everflon™ PTFE D60 should be gently mixed or rolled monthly and prior to use.

Storage and handling areas should be clean.Keep dispersiondrums closed and clean to avoid both contamination and coagulation by drying at the liquid surface. High processing temperatures will cause even very small foreign particles to become visible and/or to make defects in finished products.Good housekeeping and careful handling are essential.

Item	Test Method	Unit	Typical Value
GENERAL
Particle Size	ASTM D4441	μm	0.28
Solids Content	ASTM D4441	%	60
pH of Dispersion	ASTM D4441		9
Brookfield Viscosity	ASTM D2196	Mpa.s	15~30
Melting Point	ASTM D2116	°C	260