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ASTM D 7194 Document Information:
Title
Standard Specification for Aerospace Parts Machined from Polychlorotrifluoroethylene (PCTFE)
ASTM International
Publication Date:
Jul 1, 2005
Scope:
This specification is intended to be a means of calling out finished
machined parts ready for
aerospace use. Such parts may also find use in selected commercial
applications where there are
clear benefits derived from the use of parts with known or controlled
crystallinity, high molecular
weight, good molecular weight retention, dimensional stability in the
finished part, and tightly
controlled engineering tolerances.
This specification establishes requirements for parts machined from
virgin, unplasticized, 100 %
polychlorotrifluoroethylene (PCTFE) homopolymers.
This specification does not cover parts machined PCTFE copolymers,
PCTFE film or tape less than
0.25-mm [0.010-in.] thick, or modified PCTFE (containing pigments or
plasticizers).
This specification does not allow parts containing recycled material.
This specification classifies parts into three classes based upon
intended uses and exposures:
oxygen-containing media, reactive media, and inert gases.
Application
- PCTFE components covered by this specification are virgin, 100 %
PCTFE resin, free of
plasticizers and other additives. The components are combustion
resistant in oxygen, dimensionally
stable, and meet other specific physical characteristics appropriate
for their end use. They are
used in valves, regulators, and other devices in oxygen, air, helium,
nitrogen, hydrogen, ammonia,
and other aerospace media systems. The components typically are used
as valve seats, o-rings,
seals, and gaskets. They are removed and replaced during normal
maintenance procedures. The
components provide reliable sealing surfaces resulting in proper
closure of valves and related
devices and no leakage from the system into the environment. They will
experience static mechanical
loading, cyclic mechanical loading, temperatures ranging from
cryogenic to 71°C [160°F],
and pressures up to 46.2 MPa [6700 psi].
The values stated in SI units are to be regarded as standard. The
values in brackets are for
information only.
The following precautionary caveat pertains only to the test methods
portion, Section 12, of this
specification: This standard does not purport to address all of the
safety concerns, if any,
associated with its use. It is the responsibility of the user of this
standard to establish
appropriate safety and health practices and to determine the
applicability of regulatory
limitations prior to use.
NOTE 1 - There is no equivalent ISO standard.
Keywords:
- annealing
- dimensional stability
- finished parts
- PCTFE
- polychlorotrifluoroethylene
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