This specification covers 14 grades of road tar as follows: RT-1, RT-2, RT-3, RT-4, RT-5, RT-6, RT-7, RT-8, RT-9, RT-10, RT-11, RT-12, RT.C.B.-5, and RT.C.B.-6. The tar shall conform to the requirements prescribed for (1) water content, (2) specific gravity, (3) specific viscosity, (4) distillate content, (5) softening point of residue from distillation, and (6) total bitumen soluble in carbon disulfide. The properties enumerated shall be determined by the specified test methods including Engler and float tests, distillation test, and ring-and-ball test.
| ASTM International | |
|---|---|
| Product Category | Standards and Technical Documents |
| Product Number | ASTM D490-92(2016) |
| Product Name | Standard Specification for Road Tar (Withdrawn 2023) |
