Viscosity Grade Bitumen

Viscosity Grade Bitumen (Asphalt) is a standard grade Bitumen usually used as a Paving Grade Bitumen suitable for road construction and for the production of asphalt pavements with superior properties. This grade of Bitumen is mainly used in the manufacture of hot mix asphalt for bases and wearing courses, and possesses characteristics and qualities unique sand quite different from other agents. They achieve very flexible and tenacious connections with other materials due mainly to viscoelastic response of bitumen, which behavior depends on how fast charges are applied.

Viscosity grade bitumen have a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature/ viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability and application temperatures of bitumen. In the Viscosity Graded Bitumen specifications further special emphasizes is placed on the Bitumen ductility.

Viscosity Grade Bitumen
VG 40 VG 30 VG 20 VG 10 Test Method
Absolute Viscosity at 60°C, Poises Min.3200 Min.2400 Min.1600 Min.800 IS 1206 (Part 2)
Kinematic Viscosity at 135°C, cSt Min.400 Min.350 Min.300 Min.250 IS 1206 (Part 3)
Flash Point (Cleveland Open Cup,) °C Min.220 Min.220 Min.220 Min.220 IS 1209
Solubility in trichloroethylene, % Min.99 Min.99 Min.99 Min.99 IS 1206
Softening Point.(R&B), °C Min.50 Min.47 Min.45 Min.40 IS 1205
Penetration @ 25°C, 0.1 mm 100 gm, 5 sec 40-60 50-70 60-80 80-100 IS 1203
Testson residue from thin film oven tests/RTFOT
i) Viscosity ratio at 60°C Max.4 Max.4 Max.4 Max.4 IS 1206 (Part 2)
ii) Ductility at 25°C, cm, after thinfilm oven test Min.25 Min.40 Min.50 Min.75 IS 1208
Specific Gravity @ 27/27 °C Min.0.99 Min.0.99 Min.0.99 Min.0.99 IS 1202
Conforms to BIS (IS 73:2006) Specifications


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