In the early 1960s, an improved asphalt grading system was developed that incorporated a rational scientific viscosity test.
The testing bath temperature must be 60° ± 0,3 °C,(average road surface temperature during sunshine) and 135 °C (average temperature of bitumen when mixing asphalt).
In hot climates, bitumen with low penetration and high viscosity is used (eg VG40), so it will not flow (deform) with the high ambient temperature., and bitumen with high penetration and low viscosity is used in cooler regions. so it will not “crack” under freezing temperatures (eg VG10) .

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Test
Method
30-40
40-50
60-70
85-100
100-120
200-300
Specific gravity @25/25C ASTM D70 1/01-1/06 1/01-1/06 1/01-1/06 1/01-1/05 1/01-1/04 0.99-1/04
Penetration ,25°c,100g 5s,min ASTM D5 30-40 40-50 60-70 85-100 100-120 200-300
Softening point °C ASTM D-36 55-63 52-60 49-56 45-52 42-49 32min
Ductility ,25°c,5cm/min/cm ASTM D-113 100 min 100 min 100 min 100 min 100 min 100 min
Flash Point °C ASTM-D92 250 min 250 min 250 min 230 min 250 min 177min
Solubility in trichloroethylene (min %) ASTM-D2042 99.5 min 99.5 min 99.5 min 99.5 min 99.5 min 99.0min
Spot test A.A.S.H.T.T102 Negative Negative Negative Negative Negative Negative
Drop in penetration after heating% ASTM-D5&D6 20 max 20 max 20 max 20 max 20 max 37min
Loss on heating(%wt) ASTM-D6 0.2 max 0.2 max 0.2 max 0.5 max 0.2 max 1max
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