Viscosity Grade Bitumen
Viscosity Grade VG-30
A higher-viscosity paving binder designed for demanding hot-mix asphalt and road applications where VG-30 is specified by the project authority.
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Viscosity Grade Bitumen
Viscosity Grade VG-10
A lower-viscosity paving bitumen graded by viscosity at 60°C and 135°C, suitable for applications that require easier pumping, spraying and mixing.
- Grade
- VG-10
- Specification Basis
- IS 73:2013 — Paving Bitumen, viscosity grading system
- Product Group
- Viscosity Grade Bitumen
Technical Product Data
Product Information
Viscosity Grade VG-10 is a paving bitumen classified primarily by absolute viscosity at 60°C and kinematic viscosity at 135°C under the Indian viscosity-grading system. Compared with VG-30, VG-10 is softer and less viscous, which can improve workability and sprayability where a lower-viscosity binder is specified.
The VG designation belongs to the IS 73 system. It should not be presented as automatically equivalent to ASTM AC viscosity grades or penetration grades. Project engineers should select the grade according to the governing road authority specification, climate, aggregate system and pavement design.
Applications
- Surface treatments and spray applications where VG-10 is specified
- Hot-mix asphalt requiring lower binder viscosity
- Paving in cooler service conditions, subject to local design requirements
- Bituminous mixes where easier pumping and coating are beneficial
URMEX viscosity-grade range: VG-10 and VG-30. VG-10 is the softer/lower-viscosity option; VG-30 provides higher viscosity for heavier-duty paving conditions.
| Property | Test Method | Unit | Requirement | Note |
|---|---|---|---|---|
| Penetration at 25°C, 100 g, 5 s | IS 1203 | 0.1 mm | Min. 80 | |
| Absolute Viscosity at 60°C | IS 1206 (Part 2) | Poise | 800–1,200 | Primary grading property |
| Kinematic Viscosity at 135°C | IS 1206 (Part 3) | cSt | Min. 250 | |
| Flash Point, Cleveland Open Cup | IS 1448 [P:69] | °C | Min. 220 | |
| Solubility in Trichloroethylene | IS 1216 | % | Min. 99.0 | |
| Softening Point (Ring & Ball) | IS 1205 | °C | Min. 40 | |
| Viscosity Ratio at 60°C after RTFO | IS 1206 (Part 2) | ratio | Max. 4.0 | |
| Ductility at 25°C after RTFO | IS 1208 | cm | Min. 75 |
Specification limits are editable and should be aligned with the buyer’s purchase specification and the shipment Certificate of Analysis.
The specification table follows IS 73:2013 requirements for VG-10. The grade is defined by viscosity limits and supporting properties including penetration, flash point, solubility, softening point and aging behavior.
Batch acceptance should be based on the agreed project specification and Certificate of Analysis. If a buyer requests ASTM test methods, the purchase specification should clearly state the conversion or alternative method rather than assuming direct equivalence.
Packaging & Supply
Supply can be arranged in heated bulk, steel drums or jumbo bags depending on order size, destination and discharge facilities. Packaging and loading details remain editable for each shipment.
Handling & Storage
Use closed, dry and heated transfer systems designed for paving bitumen. Avoid water contamination and overheating. Personnel should use thermal protective clothing, gloves and face/eye protection during hot handling.
Buyer Questions
Frequently Asked Questions
What is VG-10 bitumen?
VG-10 is a viscosity-graded paving bitumen defined under IS 73, with absolute viscosity at 60°C of 800–1,200 Poise and minimum kinematic viscosity at 135°C of 250 cSt.
Is VG-10 the same as penetration bitumen 80/100?
No. They use different grading systems. VG-10 is defined by viscosity under IS 73, while 80/100 is a penetration designation. Any equivalence must be established by the project specification and test results.
Where is VG-10 commonly used?
It is used where a lower-viscosity paving binder is specified, including certain surface treatments, spray applications and asphalt mixtures requiring easier workability.
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