PATCH REPAIRS IN BUTYL MATERIAL

TM 10-8415-210-13&P 5-8. STITCHES, SEAMS AND STITCHING. (CONT) (2) Thread Ends. All thread ends shall be trimmed to a length of not more than Y4 inch. (3) Bartacking. Bartacking shall be 3/8 ± 1/16 inch in length and 1/8 ± 1/32 inch in width and shall contain 28 stitches. Bartacking shall be free from thread breaks or loose or tight stitching. 5-9. PATCH REPAIRS IN BUTYL MATERIAL. This task covers: a. General Repair Instructions b. Repair Punctures Less than % inch Diameter c. Repair Tears up to 3 inches Long d. Repair Tears over 3 inches Long and Holes Greater than ¼ inch in Diameter e. Patching Instructions INITIAL SETUP Tools: Maintenance Kit (Appendix B, Section III, Item 2) Roller, Hand (Appendix B, Section III, Item 3) Materials/Parts: Adhesive, Carboline (Appendix F, Item 3) Alcohol, Isopropyl (Appendix F, Item 4) Cloth, Nylon, Butyl Rubber Coated Talc, Tech (Appendix F, Item 21) a. General Repair Instructions. Component areas containing holes or tears may be repaired by the application of two superimposed patches of similar material to both sides of the item. Areas containing surface defects that do not extend through the material may be repaired by the application of a single patch to the outside of the item. All patches shall be made from serviceable material obtained from maintenance kit, bulk material, or salvaged items. A patch shall be smoothly and evenly adhered to the material so that when subjected to flexing action, will show no lifting at the edges, cracking, flaking or removal of the cement or patch. The repaired area shall show no stiffening or tackiness which would effect the serviceability of the component. In no case shall patches be applied to seams. Repair of fabric coating defects by methods other than patching is not authorized. b. Repair Punctures Less than 1/2 inch Diameter. Use of pre-cut patches obtained from maintenance kit is authorized. Patch shall be at least 1/2 � 1/4 inch in diameter. c. Repair Tears up to 3 inches Long. Tears up to 3 inches in length, but 1/2 inch or less in width may be repaired using patches cut at least 1 inch larger than the damaged area on all sides. d. Repair Tears over 3 inches Long and Holes Greater than 1/2 inch in Diameter. Repair of tears longer than 3 inches or holes greater than 1/2 inch diameter is not authorized. e. Patching Instructions. (1) Obtain a patch as required by paragraphs a., b., c. or d. above. 5-4