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ASTM D490-92(1997)
- Standard Specification for Road Tar
- standard by ASTM International, 01/01/1997
- Publisher: ASTM
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1.1 This specification covers 14 grades of 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.