Class 1. Substances freely soluble in carbon bisulphide and in U.S.P. petroleum ether (75% or more).
This class includes paraffin base petroleum residues, Ozokerite, Montan Wax and Paraffin..

Class 2. Substances freely soluble in carbon bisulphide and largely soluble in petroleum ether (40-75%).
This class includes all commercial asphalts such as asphaltic base petroleum residuals, Trinidad asphalt,
Bermudez asphalt, Gilsonite, Cuban asphalt, Tabbyite, air blown asphalt and pressure tars.

Class 3. Substances freely soluble in carbon bisulphide and slightly soluble in petroleum ether under
40%. This class includes the usual binders and pitches such as coal tar pitch, Grahamite, Glance pitch and
Manjak.

Class 4. Substances slightly soluble in carbon bisulphide. This class includes Albertite, Wurtzilite, Ela-
terite, Impsonite.
Class 5. Substances practically insoluble in carbon bisulphide. This class includes coals and carbonifer-
ous shales such as peat, lighnite, bituminous coal, cannel coal, anthracite coal, bituminous or oil shales.
References: Ladoo, Bureau of Mines Report No. 2121. Abraham, Asphalts and Allied Substances.

Viscosity S. U. at 210° F-100-150 (must be under 100 if for cold

application).

Viscosity Furol at 104° F-100-500 (must be under 199 if for cold

application).

Illinois State Highway Specification for Road Oil.

SPECIFICATION S1.

(Heavy Oil, Hot Application.)

HEAVY OIL FOR SURFACE TREATMENT OF BITUMINOUS OR WATERBOUND MACADAM ROADS. The road oil shall be homogeneous, free from water and shall not foam when heated to 150°C (302°F). It shall conform to the following requirements: Specific gravity 25°C/25°C (77°F/77°F), not less than 0.980. Flash point, not less than 150°C (302°F).

Specific viscosity at 100°C (212°F), 30.0 to 70.0.

Float test at 50°C (122°F), 100 seconds to 200 seconds.

Loss at 163°C (325°F) 5 hours, not over 5.0%.

Float test of residue at 50°C (122°F), 120 seconds to 240 seconds. Total bitumen, not less than 99.5%.

Per cent of total bitumen insoluble in 86° Be' naphtha, 10 to 25%. Fixed carbon, 7 to 15%.

SPECIFICATION S2.

(Medium Oil, Hot Application.)

MEDIUM OIL FOR SURFACE TREATMENT OF BITUMINOUS OR WATERBOUND MACADAM ROADS. The road oil shall be homogeneous, free from water and shall not foam when heated to 100°C (212°F). It shall conform to the following specifications: Specific gravity 25°C/25°C (77°F/77°F), 0.960 to 1,010.

Flash point, not less than 100°C (212°F).

Specific viscosity at 100°C (212°F), 5.0 to 15.0.

Float test at 32°C (90°F), 30 seconds to 90 seconds.

Loss at 163°C (325°F) 5 hours,. not over 15.0%.

Float test of residue at 50°C (122°F), 90 seconds to 180 seconds.
Total bitumen, not less than 99.5%.

% total bitumen insoluble in 86° Be' naphtha, 7.0% to 20.0%.
Fixed carbon, 5.0% to 10.0%.

SPECIFICATION S3.

(Light Oil, Cold Application.)

LIGHT OIL FOR SURFACE TREATMENT OF BITUMINOUS OR WATERBOUND MACADAM OR OF GRAVEL ROADS: The road oil shall be homogeneous and free from water. It shall conform to the following requirements:

Specific gravity 25°C/25°C (77°F/77°F), 0.920 to 0.970.

Specific viscosity at 25°C (77°F), 30.0 to 70.0.

Loss at 163°C (325°F) 5 hours, 20.0% to 30.0%.

Total bitumen, not less than 99.5%.

% total bitumen insoluble in 86° Be' naphtha, 5.0% to 20.0%. Fixed carbon, 4.0% to 10.0%.