OH-1. ROAD OIL FOR HOT APPLICATION. 



The road oil shall be homogenous, free from water, and shall General. 



not foam when heated to 120° C. (248° F.) 



It shall meet the following requirements: Physical and 



„ , „ „ , „ chemical prop- 



1. Specific gravity 25°/25° C. (77°/77° F.), erties. 



not less than 0.980 



2. Flash point not less than 80° C. (176° F.) 



3. Specific viscosity 100° C. (212° F.) not more than 60 



4. Float test at 32° C. (89.6° F.) not less than 60 sec. 



5. Loss at 163° C. (325° F.), 5 hours not more than 15% 



a. Float test of residue 50° C. (122° F.), 



not less than 110 sec. 



6. Total bitumen (soluble in carbon disulphide), 



not less than 99.5% 



7. Per cent of total bitumen insoluble in 86° B. naptha, 



not less than 6.0% 

 Tests of the physical and chemical properties of the road oil Methods of test- 

 shall be made in accordance with the following methods : 



1. Specific gravity, U. S. Department of Agriculture Bulletin 



314, p. 5. 



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. Float test, U. S. Department of Agriculture Bulletin 314, 



p. 9. 



5. Volatilization test, U. S. Department of Agriculture Bulle- 



tin 314, p. 19. 



6. Total bitumen, U. S. Department of Agriculture Bulletin 



314, p. 25. 



7. Bitumen insoluble in naphtha, U. S. Department of Agri- 



culture Bulletin 314, p. 28. 



This specification provides primarily for a material to be used 

 in the hot surface treatment of macadam, gravel, or shell roads, 

 to form a wearing mat or carpet. The specification is intended to 

 cover residual asphaltic petroleums, cut-back oil asphalts, and 

 some crude asphaltic petroleums. 



A successful treatment requires that the road surface shall be 

 in a good state of repair, well consolidated, free from holes or 

 depressions, and thoroughly swept for the removal of dust and 

 detritus before the application is made. Newly constructed or 

 resurfaced roads should be permitted to consolidate under traffic 

 before the oil is applied. The oil should be heated to a tempera- 

 ture of 200° F to 250° F. before applying, and the application 

 should be made by means of a pressure distributor at the rate of 



