DuPont™ Teflon® PTFE DISP 35
Fluoropolymer Resin
PTFE AQUEOUS DISPERSION

Product Information

1、Description
DuPont™ Teflon® PTFE DISP 35 is a milky white aqueous PTFE dispersion stabilized with an anionic dispersant. It is used for co-coagulation with various fillers to produce products with a range of strengths, porosities and colors required for the application. The use of reinforcing agents can offer such advantages as improved resistance to cut-through and abrasion, increased dimensional and form stability, higher rate of heat dissipation and greater resistance to wear. When properly processed, the PTFE resin in DISP 35 exhibits the superior properties typical of the fluoropolymer resin: retention of properties after service at 260℃(500℉), and useful properties at -240℃(-400℉).

DISP 35 aqueous dispersion provides:
•ability for co-coagulation
•inertness to nearly all industrial chemicals and solvents
•stability at high temperatures
•excellent dielectric properties
•lowest coefficient of friction of any solid material
•non-stick characteristics

2、Typical Applications
DISP 35 is used in the preparation of blends for coating of high performance bearings and seals. DISP 35 can also be co-coagulated with special ingredients to be formed into specific end-uses, such as fuel cell electrodes.

3、Processing
Compositions of DISP 35 resins are reinforced with inorganic particles, such as graphite and powdered metals, by using various co-coagulation processes. Co-coagulation is accomplished by chemical addition or mechanical agitation. The viscosity and wetting power of the dispersion can be increased by adding wetting agents, such as anionic or nonionic dispersants.

4、Storage and Handling
DISP 35 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℃(104℉)should be avoided. The dispersion must be protected from freezing, which will cause irreversible settling. The optimum storage temperature range is 7-24℃(45-75℉). If dispersions are to be stored for extended periods, lower-temperature storage is desirable. For optimal performance, DISP 35 should be gently mixed or rolled monthly and prior to use.

Ammonium hydroxide is used by DuPont 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 the 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 or coagulation and to minimize foaming. Ideally, the dispersion should be conveyed by gravity from storage to processing stations.

Storage and handling areas should be clean. Keep dispersion drums 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 or to make defects in finished products. Good housekeeping and careful handling are essential.

Packaging
DISP 35 is packaged in 30-L(8 gal)non-returnable drums and 1000-L(264-gal)recyclable containers. Contact the local DuPont sales office for package sizes available in your specific geographic area.

Typical Property Data for DuPont™ Teflon® PTFE DISP 35 Fluoropolymer Resin

Note:Teflon PTFE DISP 35 meets the requirements of ASTM D 4441-98, type I, grade 2, class A.
Typical properties are not suitable for specification purposes.