SPECIFICATIONS. 
OC-l. PETROLEUM PRODUCT FOR DUST PALLIATIVE. 
General. The petroleum product shall be homogeneous and free from 
water. 
Physical and It shall meet the following requirements: 
SS. Cal Pr ° P " 1. Specific gravity 25°/25° C. ( 77°/77° F. ) _not more than 0.940 
2. Flash point not less than 100° C. (212° F.) 
3. Specific viscosity at 25° C. (77° F.) not more than 10 
4. Loss at 163° C. (325° F.), 5 hours not more than 15% 
a. Float test of residue at 32^ C. (89.6° F.) liquid 
5. Total bitumen (soluble in carbon disulphide), 
not less than 99.8% 
Methods of test- Tests of the physical and chemical properties of the petroleum 
product shall be made in accordance with the following methods i 
1. Specific gravity, U, S. Department of Agriculture Bulletin 
314, p. 4. 
2. Flash point (open cup), U. S. Department of Agriculture 
Bulletin 314, p. 17. 
3. Specific viscosity (on first 50 c. c), U. S. Department of 
Agriculture Bulletin 314, p. 7. 
4. Volatilization test, U. S. Department of Agriculture Bulletin 
314, p. 19. 
a. Float test, U. S. Department of Agriculture Bulletin 
314, p. 9. 
5. Total bitumen, U. S. Department of Agriculture Bulletin 314, 
p. 25. 
This specification provides primarily for a material to be used 
as a dust palliative on macadam, shell, gravel, or well compacted 
earth or sand-clay roads. It is not expected to build up a bitu- 
minous mat on the road surface, as materials meeting this speci- 
fication are deficient in binding value. The specification is in- 
tended to cover some crude petroleums, heavy petroleum dis- 
tillates, and light fluid residual petroleums. 
To obtain the best results the road surface should be free of 
any great excess of dust when the application is made. The oil 
may be applied without heating and the application should prefer- 
ably be made by means of a pressure distributor at the rate of 
from one-eighth to one-fourth of a gallon per square yard. No 
cover of earth, sand, gravel, or stone chips should be necessary. 
The number of applications required to lay the dust successfully 
throughout an entire season will depend upon traffic and climatic 
conditions; one may prove sufficient, but three or four may be 
required. 
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