OC-2. ROAD OIL FOR COLD APPLICATION. 
The road oil shall be homogeneous and free from water. General. 
It shall meet the following requirements : 
1. Specific gravity 25°/25°C. (77°/77°F.)____ 0.935 to 0.970^.^;^^ 
2. Fash point not more than 50°C. (122°F.) erties. 
3. Specific viscosity at 25°C. (77°F.) SO to' 120 
4. Loss at 163°C. (325°F.), 5 hours not more than 30% 
a. Float test of residue at 50° C. (122° F.), 
not less than 90 sec. 
5. Total bitumen (soluble in carbon disulphide), 
not less than 99.5% 
6. Per cent of total bitumen insoluble in 86 °B. naphtha, 
not less than 6.0% 
Tests of the physical and chemical properties of the road oil Methods of test- 
ing. 
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 (loss at 163°C), 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. 
6. 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 cold surface treatment of macadam or shell roads to form 
a thin wearing mat or carpet which may be maintained or built 
up by subsequent treatments of either the same type of material 
or a heavier product (specification OH-1). The specification is 
intended to cover certain types of crude or topped petroleums 
and cut-back oil asphalts. 
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 
roads should be permitted to consolidate under traffic before 
the oil is applied. The oil may be applied without heating, and 
the initial applications should be made by means of a pressure 
distributer at the rate of from one-third to one-half a gallon per 
square yard. It should be covered with a uniform layer of dust- 
less broken stone, all of which will pass a one-half or three- 
