Based on viscosity BIS revised IS-73-1992 specifications (Viscosity at 60oC) there are four grades VG-10, VG-20, VG-30 & VG-40. A few qualification tests like specific gravity, water content, ductility, loss on heating & Farass breaking point were removed from IS:73-1992 as these tests do not have any relationship with the performance of the product.
Viscosity Grade Bitumen is widely used in spraying applications such as surface-dressing and paving in very cold climate. It is also used to manufacture Bitumen emulsion and Modified Bitumen products.
SPECIFICATION FOR VISCOSITY GRADE BITUMEN
| PROPERTY | RANGE | |||
| VG-10 | VG-20 | VG-30 | VG -40 | |
| ABSOLUTE VISCOSITY 60°C POISE MIN | 800 | 1000 | 2400 | 3200 |
| KINEYATIC VISCOSITY 135°C CST MIN | 250 | 100 | 350 | 400 |
| FLASH POINT MIN°C | 220 | 220 | 220 | 220 |
| SOFTENING POINT MIN °C | 40 | 45 | 47 | 50 |
| PENETRATION 0.1 MIN. 25 °C | 80-100 | 60-80 | 50-70 | 40-60 |
| DVCTILITY ON MIN .25°C | 75 | 50 | 40 | 25 |
| VICOSITY RATIO 60°C MAX | 4 | 4 | 4 | 4 |
| SOLURILITY IN TCE MIN | 99 | 99 | 99 | 99 |
