US Additive Jacket, M1
Bore wear reducing additive jacket M1 is used with increment No. 3 when firing M86 series propelling charges at full charge. It consists of two cloth backed sheets of additive mixture stitched together. The additive mixture is composed of 47 percent titanium dioxide and 53 percent wax. The cloth backing, which is bonded to and overlaps the sheets of additive mixture, is stitched to an unbonded tough plastic film casing which serves as a jacket liner. When compressed along the seams, the jacket arches to form a cylinder with a diameter of approximately 7 1/2 inches.
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