Penetration Grade Bitumen is a refined hydrocarbon binder derived from crude oil through fractional distillation and further air blowing or vacuum processing. It is classified based on its penetration value, which indicates the relative hardness or softness of the bitumen at 25°C, measured using a standardized needle penetration test (ASTM D5 / EN 1426).
The penetration value reflects the material’s rheological behavior, workability during mixing, and resistance to deformation under traffic loads. Lower penetration numbers indicate harder bitumen, while higher numbers indicate softer bitumen.
Common Penetration Grades
30/40 – Very hard, high load resistance
40/50 – Heavy traffic and high-temperature regions
60/70 – Most widely used general paving grade
80/100 – Moderate climates and low traffic roads
100/120 – Cold regions and light-duty applications
Manufacturing & Refining Process
Crude Oil Distillation
Crude oil is heated in a vacuum distillation column to separate lighter fractions (gasoline, diesel, fuel oil).
Residue Processing
The heavy vacuum residue is further refined to achieve desired penetration, viscosity, and temperature performance.
Quality Adjustment
* Controlled blending and air oxidation ensure:
* Stable penetration range
* Improved aging resistance
* High purity and solubility
Final Testing & Certification
Each batch is tested to comply with ASTM, EN, IS (IS 73:2013), or customer-specific specifications.
Key Characteristics
High Viscosity & Rheological Stability
* Provides excellent load distribution under heavy traffic.
* Ensures proper coating of aggregates during hot mix asphalt production.
Superior Water Resistance
* Hydrophobic nature prevents stripping and moisture damage.
* Enhances pavement durability in monsoon-prone regions.
Thermal Performance
* Maintains flexibility at service temperatures.
* Resists cracking at lower temperatures and rutting at higher temperatures.
Strong Aggregate Adhesion
* Forms durable bonds with both acidic and basic aggregates.
* Improves fatigue resistance of asphalt pavements.
Aging & Oxidation Resistance
* Low loss on heating ensures long-term performance.
* Retains elasticity and penetration characteristics over time.
Consistency & Purity
* High solubility (>99%) confirms absence of impurities.
* Uniform composition ensures consistent paving performance.
Typical Mechanical & Physical Properties
| Property | Typical Range |
|---|---|
| Penetration @ 25°C | 30–40 to 100–120 (grade dependent) |
| Softening Point (°C) | 45 – 55 |
| Ductility @ 25°C | >100 cm |
| Specific Gravity | 1.00 – 1.05 |
| Flash Point (°C) | ≥250 |
| Fire Point (°C) | ≥300 |
| Viscosity @ 135°C | Grade dependent |
| Loss on Heating | <1% |
| Solubility | >99% |
Climate & Traffic Suitability
| Grade | Recommended Use |
|---|---|
| 30/40 | High temperatures, heavy traffic, expressways |
| 40/50 | Warm climates, industrial roads |
| 60/70 | Moderate climates, highways, urban roads |
| 80/100 | Cooler regions, secondary roads |
| 100/120 | Cold climates, low-traffic applications |
Available Supply Forms & Logistics
Packaging Options
* Steel Drums (180–200 kg) – Ideal for export and controlled usage
* Bulk Tankers – Large-scale road projects and refineries
* Poly Bags / Jumbo Bags – Easy handling, minimal contamination
* Bitutainers – International shipping with temperature control
* Bulk Storage Supply – Direct plant-to-site delivery
Storage & Handling Guidelines
* Store between 120°C – 150°C for pumping.
* Avoid overheating to prevent oxidation and hardening.
* Use insulated tanks for long-term storage
Applications of Penetration Grade Bitumen
Road & Highway Construction
* Hot Mix Asphalt (HMA)
* Dense Bituminous Macadam (DBM)
* Bituminous Concrete (BC)
* Surface dressing & premix carpets
* Flexible pavement layers
Industrial Applications
* Roofing felts & membranes
* Bituminous paints and coatings
* Expansion joint fillers
* Vibration-damping compounds
Waterproofing & Protection
* Foundation damp proofing
* Basement waterproofing systems
* Concrete and steel corrosion protection
Specialized Uses
* Pipeline coating
* Crack sealing materials
* Industrial adhesive formulations
Advantages Over Other Bitumen Types
* Proven performance in traditional road construction
* Easier handling compared to polymer-modified bitumen
* Cost-effective for large infrastructure projects
* Wide availability across global markets