This specification covers a virgin, unfilled
polytetrafluoroethylene (PTFE) in the form of extruded and sintered
rods, tubes, and profiles.
These products have been used typically for parts, such as
bushings, and insulators, requiring chemical inertness up to 500 °F
(260 °C) and better mechanical and/or electrical properties than
AMS3656, but usage is not limited to such applications. When
improved dimensional stability is required, it is recommended that
stress relieved product in accordance with AMS3659 be specified.
For parts such as seals, back-up rings and bearings that do not
require dielectric properties and radiographic inspection it is
recommended to use AMS3678/1 Grade B.
Safety - Hazardous Materials
While the materials, methods, applications, and processes
described or referenced in this specification may involve the use
of hazardous materials, this specification does not address the
hazards which may be involved in such use. It is the sole
responsibility of the user to ensure familiarity with the safe and
proper use of any hazardous materials and to take necessary
precautionary measures to ensure the health and safety of all
Types 1 and 2, which were defined in previous revisions of this
specification, have been combined. For documentation which
specifies Type 1 or Type 2 of this specification, all of the
requirements of this specification now apply.
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