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