TM 1-1500-204-23-11
Table 3-2.
Material Temperature Capabilities -- Continued
Application
Material
Maximum Temperature 1
Polyester
<400 F
Nylon
<400 F
Flashbreaker Tape
Coated Fiberglass
<550 F
Polyimide
<800 F
1 Maximum temperature values relect industry averages for each material type and are listed for reference
purposes only. Use only vendor supplied material data when selecting materials for a given cure
temperature.
2 Sealant tapes are made from a wide variety of materials and blends of materials. For simplicity, they
are listed by temperature application rather than speciic chemical makeup.
6 Fasteners. Composite fasteners are
2.
Large footprint - the
speciically designed to ensure the structural integrity
backside needs a large
of a composite repair. Use fasteners that are elec-
shop head or footprint to
trochemically compatible with the composite structure
prevent pulling through.
being repaired. For example, in carbon/epoxy, gal-
3.
Limited torque - over-
vanic corrosion of the fasteners can be avoided by
torqueing
fasteners
using fasteners made of titanium (preferred), monel or
damages composites.
Corrosion Resistant Steel (CRES). Cadmium plated
4.
For sandwich panels,
or aluminum, fasteners are not compatible. Refer to
limited or adjustable
TM 1-1500-204-23-10, Chapter 7 for additional infor-
clamp-up force; this pre-
mation on conventional fastening systems or consult
vents the core crushing.
system speciic technical manuals for information not
covered in this technical manual.
(2) Selection. There are few rules
of thumb that can be applied to fastener selection
a Background. Engineers
consider
for composite parts.
many different factors when selecting fasteners for
1.
Consult the system spe-
a particular application.
These factors must be
ciic technical manual. If
addressed for all the materials the fastener goes
information is not given
through. These factors include, but are not limited
in the technical manual,
to, the following:
request an engineering
Strength - lap/shear/tension/bearing
disposition.
Compos-
ite fasteners are specif-
Corrosion potential
ically designed for this
application to insure the
Removable or permanent
structural integrity of the
repair.
Access for fastener installation and/or removal
2.
Use fasteners that are
electrochemically com-
(1) Features. Features common to
patible with the com-
most fasteners used in composites include:
posite structure being
repaired.
For exam-
1.
Nonhole illing fas-
ple, in carbon/epoxy,
teners traditionally used
galvanic corrosion of
for metal repairs that
the fasteners can be
expand to ill the hole
avoided by using fas-
will damage composite
teners made of tita-
parts.
nium (preferred), monel
3-14