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 TM 55-1915-200-SDC
understood that the patch is an emergency expedient and is not intended, or should it be considered, a substitute for a
permanent repair. The patch is relatively inert, being adversely affected only by excessive (200 F.) heat and
concentrated acids.
The success of a properly applied patch is dependent upon two factors, strength and adhesion, and with these two factors
present, the patch will be completely effective. In the process of curing, the patch will have the tendency to adhere well
to metal and other surfaces. The process of applying the plastic patch actually reinforces the activated resin with fibrous
glass material. The reinforcement of the resin greatly increases the strength when the patch is cured.
Should fibrous glass materials not be available, reinforcing can be accomplished by the use of cloth such as a blanket or
some other material which will absorb the resin. In most cases, reinforcing with such material will not provide the
equivalent strength obtained through the use of fibrous glass materials. Although substitute materials are highly
effective, they are to be used only when materials herein specified are unavailable.
8-16. TYPES OF PATCHES. Several types of patches are possible for repairing pipes and bulkheads in diverse
locations and with diverse uses. They are described in the following paragraphs:
a. Pipe patch. The components of the repair kit normally used for repairing a pipe in the piping system are the
liquid resin and liquid hardener mixture together with the prescribed fibrous glass material. This mixture is approved for
patching the following piping systems:
(1) Fresh water.
(2) Salt water.
(3) Fuel oil, 'lubricating oil, diesel oil.
(4) Gasoline.
(5) Refrigeration.
b. Flat patch. This patch is the metallic and nonmetallic surface repair patch. The flat patch utilizes the same
components as the pipe patch. The mixture is approved for patching the following metallic and nonmetallic surfaces:
(1) Metal bulkheads and decks.
(2) Tanks, voids, and cofferdams.
(3) Wood surfaces.
c. Paste patch. This patch also is a metallic and nonmetallic surface repair patch. The material normally used for
patching small holes, cracks, fillets, and so forth, is the paste resin and paste
8-22
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