(a) The asphalt cement shall be prepared by the careful distillation of petroleum with steam agitation, at a temperature not exceeding 700 degrees Fahrenheit until its consistency is reduced to between 35 and 60, with a number 2 needle weighted to 100 grams. All shipments shall be marked with a lot number and 10 samples taken at random from each lot shall not vary more than 5 on a Dow machine, above or below the penetration established by the urban county engineer, nor more than 10 percent from the average of ductility.
(b) It shall be in addition thereto comply with the following practical and established tests:
(1) It shall be thoroughly homogeneous.
(2) The specific gravity at 77 degrees Fahrenheit shall be not less than unity nor more than 1.435.
(3) The melting point (B. & R. Method) shall not be less than 130 degrees Fahrenheit nor more than 150 degrees Fahrenheit.
(4) The flash point (Cleveland open cup) shall not be less than 460 degrees Fahrenheit.
(5) The penetration at 77 degrees Fahrenheit (100 grams, 5 seconds) shall not be less than 40 nor more than 60 M.
(6) The penetration at 32 degrees Fahrenheit (200 grams, 1 minute) shall not be less than 20 M.
(7) The penetration at 115 degrees Fahrenheit (50 grams, 5 seconds) shall not be more than 200 M.
(8) The loss upon heating a 50-gram sample of the material in a cylindrical dish 2 3/16inches in diameter, and 1
3/8
inches high for 5 hours at 325 degrees Fahrenheit shall not exceed 1 percent by weight and the reduction in penetration at 77 degrees Fahrenheit due to such heating shall not exceed 40 percent.
(9) The ductility at 77 degrees Fahrenheit (5 cm per min. Dow mold) shall not be less than 40 cm nor more than 85 cm.
(10) The fixed carbon content shall not exceed 15.5 percent.
(11) The asphaltic cement shall be soluble in carbon bisulfide and carbon tetrachloride to the extent of not less than 99.5 percent.