SPECIFICATIONS. 



OC-l. PETROLEUM PRODUCT FOR DUST PALLIATIVE. 



GeneraL The petroleum product shall be homogeneous and free from 



v\'ater. 

 Physical and It shall meet the following requirements: 

 ertkl"*^ ^"^" 1. Specific gravity 25V25° C. (77V77° 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 

 Ing. 



product shall be made in accordance with the following methods : 



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, gi'avel, 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. 



