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DuPont™ Teflon® PTFE 602A
fluoropolymer resin
Fine Powder Lubricated Extrusion Resin
Brand
Teflon® is a registered trademark of DuPont for its brand of fluoropolymer resins, which can only be licensed by DuPont for use in approved applica-tions. Customers who wish to use the Teflon® trademark in connection with DuPont Fine Powder products under license from DuPont should contact (86) 13662986968. Without a license, customers may not identify their product as containing Teflon®, but may refer to the resin as PTFE 602A.
Description
DuPont™ Teflon® PTFE 602A (formerly TE-3661) is manufactured in North America. Teflon® PTFE 602N and Teflon® PTFE 602J are equivalent prod-ucts manufactured in the Netherlands and Japan,
respectively. All product specifications are identi-cal for the different regions.
Teflon® PTFE 602A is a white powder composed of agglomerated particles of polytetrafluoroethylene (PTFE). It can be blended with solvent and ram extruded by a process called paste extrusion. The
coherent extrudate obtains its structural integrity from the propensity of fine powder to fibrillate and form a fibrous matrix.
Teflon® PTFE 602A can be stretched significantly with no break. It can be extruded with excellent green strength even at low reduction ratios.
Properly processed products made from neat Teflon® PTFE 602A provide the superior properties typical of PTFE resins:
• retention of properties after service at 260°C (500°F)
• useful properties down to –240°C (–400°F)
• chemical inertness to nearly all chemicals and solvents
• low friction and antistick surfaces
• outstanding dielectric properties
Teflon® PTFE 602A is ASTM D4895, Type I, Grade I, Class A.
Processing
Teflon® PTFE 602A is prepared for extrusion by mixing with a liquid extrusion aid. The damp pow-der is compressed into a cylindrical preform slug and placed in the cylinder of a ram-type extruder. Under high pressure, the billet is forced through a finishing die with a large cross section selected for making beading or other special profiles.
Reduction ratio (RR) is the ratio of cross section of preform to that of extrudate; it is an extruder option also affecting the selection of resin grade.
Table 1
Typical Property Data for DuPont™ Teflon® PTFE 602A Fluoropolymer Resin
Property | ASTM Test Method |
Unit | Nominal Value |
Average Particle Diameter | D4895 | µm | 560 |
Standard Specific Gravity | D618 | - | 2.16 |
Rheometer Pressure* | D4895 | MPa(psi) | 9.8(1,420) |
Second Melt Point | D1458 | ℃(℉) | 327 (621) |
Typical properties are not suitable for specification purposes. *Reduction Ratio 100:1 |
Safety Precautions
WARNING!
VAPORS CAN BE LIBERATED THAT MAY BE HAZARDOUS IF INHALED.
Before using Teflon® PTFE 602A, read the Material Safety Data Sheet and the detailed information in the “Guide to the Safe Handling of Fluoropolymer Resins, Latest Edition," published by the Fluoro-polymers Division of The Society of the Plastics Industry—available from DuPont.
Open and use containers only in well-ventilated areas using local exhaust ventilation (LEV). Vapors and fumes liberated during hot processing, or from smoking tobacco or cigarettes contaminated with Teflon® PTFE 602A, may cause flu-like symptoms (chills, fever, sore throat) that may not occur until several hours after exposure and pass within about 24 hr. Vapors and fumes liberated during hot pro-cessing should be exhausted completely from the work area; contamination of tobacco with polymers should be avoided. Mixtures with some finely di-vided metals, such as magnesium or aluminum, can be flammable or explosive under some conditions.
Flammable solvents mixed with the resin can cause fires in ovens and mixing areas. Obtain manufactur-ers’ recommendations before using.
Storage and Handling
Fine powder can be shear damaged because of its propensity to fibrillate. Shear damaged resin will not process properly and may result in an inferior product. Fine powder can withstand significantly more abuse when it is in the below room tempera-ture transition state. Teflon® PTFE 602A fluoro-polymer resin will remain in this cold transition state until it is warmed above 19°C (66°F). If this resin is allowed to go above 19°C (66°F) at any time, it must be cooled below about 10°C (50°F) to bring it back to the cold state. Consequently, it is preferable to transport and blend in the cold state.
To prevent moisture contamination, the drum must not be opened where the ambient dew point is above the temperature of the resin. Otherwise, immediate condensation on the resin will occur and proper processing may be severely affected.
Storage and handling (blender, etc.) facilities should be kept clean and dry. Fine powder resin will rapidly attract dust and airborne contamination. Particles of Teflon® resin left in processing equip-ment will easily shear damage, resulting in product defects. It is preferred that the resin be poured from one container to another. Scooping can cause severe shear damage.
Packaging
Teflon PTFE® 602A is packaged in 27.2-kg (60-lb) containers.
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