The compound shall consist of coal-tar pitch and coal-tar solvents, suitably
blended to produce a liquid which is smooth and uniform in consistency
and which complies with the following detail requirements:
I
I,... -
.. .. .... . . _
- . .-
... - ..
-. .
< . . .
..... .
.. .. . . .: . .
a. Distillate to 440' F, percent, by weight, 25 to 35
b. Softening point of distillation residue, ' F 140 to 160
ce Water, percent, by weight, maximum 0.5 .
d. Shall be suitable for spray application at temperatures above 60' F
e, When applied at a coverage rate of 300 square feet per gallon on a
clean, smooth steel surface and allowed to dry insa ventilated 70' F,
50-percent relative-humidity atmosphere, the compound shall dry
to a firm, dry film in 24 hours.