DESCRIPTION OF BASIC MATERIALS - TM-55-1905-223-SDC0117

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Pipe patch

TM-55-1905-223-SDC Shipboard Damage Control Manual for Landing Craft Utility (LCU) NSN 1905-01-154-1191

QUANTITY OF MATERIAL REQUIRED

TM 55-1905-223-SDC

8-16. DESCRIPTION OF BASIC MATERIALS. The basic materials used in patching are described in the

following paragraphs:

Resins and hardeners. The liquid and paste resins are of the epoxy type. The liquid and paste

hardeners are chemical compounds used to harden the resins. These ingredients are packaged in prescribed

amounts. When the hardeners and resins are mixed, a chemical reaction occurs which causes the mixture to

harden. The liquid mixture sets in approximately 12 minutes, the paste mixture in approximately 17 minutes.

WARNING

Do not mix hardener with resin until all preparations have been

completed and do not intermix liquid resin and paste hardener, or paste

resin and liquid hardener. Do not mix resin or hardener from any other

source with those supplied in this kit. Improper use may cause violent

chemical reactions which can cause serious personal injury.

Void cover. This is resin-treated glass cloth that can be cut and formed to cover and support the

patching materials over a damaged area.

Woven roving cloth. This substance is made of a short staple, glass fiber woven into a thick

fluffy cloth. During the application of a plastic patch, this cloth is coated with the resin hardener mixture and

wrapped around or placed over the damaged section. This cloth provides the principal strength of the patch

and provides a method of applying the resin hardener mixture.

d. Film (PVC). The film is a thin, transparent, polyvinyl chloride material used as a separating film for

a flat patch to prevent the patch from adhering to the backup plate or supports. In pipe patching, it is used to

cover the entire patch and retain the activated resin around the patch. In this application, it is described as a

retaining cover. Kraft wrapping paper or Mylar can be substituted as retaining covers.

8-17. PATCH APPLICATION SEQUENCE. During the several steps in the application of the different

patching materials, the area covered gets progressively larger. FIGURE 8-9 illustrates the position of

patching materials relative to each other.

Sequence of Applied Patch Materials.

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