CHAPTER 17 the materials listed in Table 17.1 has not been tested for the charring effect, although Ref. 14 concluded from tests made with several cotton and woolen fabrics that resistance to destruction was increased by flame-retardant treatment only for the woolen fabrics. Some criteria are based on Ref. 13. To estimate the effect of thermal radiation on wooden ship decks, use is made of data given in Ref. 2 for charring of white pine, with and without a protective coating. Although ship decks are of a hard wood, and white pine is a soft wood, it is estimated that the effects on coated pine, which will char to a depth of 1 mm with exposure of 40 cal/cem@ from a 1-KT weapon and 71 cal/em® from a 100-KT weapon, are probably respresentative for charring of ships' decks. Table 17-1. o™ Material Canvas Tarpaulin Approximate thermal criteria for destruction of some topside combustibles, Color Weight (oz/ya=) Olive Drab 12 12 4s 10 KT 1100 xT (cal/eme) 1 MT 10 15 23 6 10 13 Kraft Board, W6C (corrugated ) Tan Kraft Board, V3C Tan 13 11-13 Fibreboard, V3S ~- 4g -- Wool Serge Navy Blue 16 17 17 17 25 Melton (Wool) Navy Blue 16 13 13 13 20 12 20 30 (corrugated) 4.75 1 KT 12-13 -- 11-13 -- 17-20 35 Wash Cotton Trousers Knaki 8 15 Wash Cotton Shirt Khaki 3 5 8.5 {12.5 15 Denim Trousers Blue g 9 8.5 9 16 Chambray Shirt Blue 3-5 9-10 6-8 17-1) 10-12 13-18