40/50 Penetration Bitumen Specification
Last updated: 2026-10-03
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40/50 Penetration Bitumen Specification
40/50 penetration bitumen is a standard-grade paving bitumen with a penetration value of 40–50 dmm (0.1 mm) at 25°C, a softening point of 50–58°C, and a typical viscosity of 300–500 Pa·s at 135°C. It is widely specified in hot climates, heavy-traffic highways, and industrial applications where higher stiffness and rutting resistance are required than softer grades such as 60/70 or 80/100.
What Is 40/50 Penetration Bitumen?
40/50 penetration bitumen is classified under the penetration grading system (ASTM D946 / EN 12591), where the number refers to the depth a standard needle penetrates the sample under defined conditions. The "40/50" designation indicates the penetration range in units of 0.1 mm at 25°C, making it a harder, more viscous grade than 60/70 penetration bitumen.
Key defining characteristics:
- Penetration (25°C, 100 g, 5 s): 40–50 dmm
- Softening point (Ring & Ball): 50–58°C
- Flash point: ≥ 250°C (minimum)
- Solubility in trichloroethylene: ≥ 99.0%
- Density at 25°C: approximately 1.01–1.06 g/cm³
- Viscosity at 135°C: 300–500 Pa·s
This grade is produced by vacuum distillation and, where required, air blowing of selected crude oils. It is commonly traded in bulk (bulk vessels, ISO tanks, flexitanks, and 150 kg–180 kg drums) from refineries in the Middle East, Asia, and Europe.
Typical bulk order parameters:
| Parameter | Typical Value |
|---|---|
| Minimum order quantity (bulk) | 500 MT |
| Standard drum weight | 150–182 kg |
| Flexitank capacity | 20–24 MT |
| ISO tank capacity | 20–24 MT |
| Vessel parcel size | 1,000–30,000 MT |
| Container load (drums) | 80–110 drums (approx. 15–20 MT) |
40/50 Penetration Bitumen Specification Table (ASTM D946 & EN 12591)
The following table consolidates the most commonly quoted specification limits for 40/50 penetration grade bitumen. Values may vary slightly by refinery and by the governing standard (ASTM vs. EN vs. IS).
| Property | Test Method | Unit | Specification Range |
|---|---|---|---|
| Penetration at 25°C | ASTM D5 / EN 1426 | 0.1 mm | 40–50 |
| Softening Point | ASTM D36 / EN 1427 | °C | 50–58 |
| Flash Point (Cleveland Open Cup) | ASTM D92 / EN 22592 | °C | ≥ 250 |
| Solubility | ASTM D2042 / EN 12592 | % wt | ≥ 99.0 |
| Density at 25°C | ASTM D70 / EN ISO 12185 | g/cm³ | 1.01–1.06 |
| Viscosity at 135°C | ASTM D4402 | Pa·s | 300–500 |
| Loss on Heating | ASTM D1754 / EN 12607 | % wt | ≤ 0.5 |
| Penetration after heating (retained) | ASTM D5 | % | ≥ 60 |
| Ductility at 25°C | ASTM D113 | cm | ≥ 100 |
| Paraffin Wax Content | EN 12606 | % wt | ≤ 2.2 |
| Asphaltene Content | ASTM D3271 | % wt | 15–25 |
| Specific Gravity | ASTM D70 | – | 1.01–1.06 |
Note: Exported cargoes frequently require a Certificate of Analysis (COA) per ASTM D946 or EN 12591, plus a third-party inspection certificate (SGS, Intertek, or Bureau Veritas) issued at the load port.
40/50 vs 60/70 vs 80/100: Penetration Grade Comparison
Choosing between penetration grades is mainly a function of climate, traffic loading, and pavement layer design. The table below compares the three most commonly traded grades.
| Property | 40/50 | 60/70 | 80/100 |
|---|---|---|---|
| Penetration at 25°C (dmm) | 40–50 | 60–70 | 80–100 |
| Softening Point (°C) | 50–58 | 46–54 | 42–50 |
| Viscosity at 135°C (Pa·s) | 300–500 | 200–350 | 120–250 |
| Relative Stiffness | High | Medium | Low |
| Best Suited Climate | Hot | Warm/Temperate | Cold/Mild |
| Rutting Resistance | Excellent | Good | Moderate |
| Low-Temperature Cracking Resistance | Lower | Moderate | Higher |
| Typical Application | Heavy-traffic highways, airport runways, hot regions | General road construction | Cold-region paving, spray seals |
| Typical FOB Price Range (USD/MT) | 380–520 | 370–500 | 360–480 |
Price ranges are indicative and vary with crude benchmarks, freight, packaging, and origin. Always confirm live pricing with your supplier.
When to choose 40/50:
- Ambient temperatures regularly exceed 35–40°C
- Heavy axle loads or high traffic volumes (e.g., container terminals, industrial haul roads)
- Airport runways and aprons
- Rutting is a known failure mode in the region
- Polymer modification is not available or not cost-effective
Global Standards and Grades: 40/50 Across ASTM, EN, and IS
While the penetration value stays consistent, different standards apply different naming and additional requirements. Understanding the cross-reference is critical for import/export documentation.
| Region / Standard | Designation | Key Differences |
|---|---|---|
| USA (ASTM D946) | 40–50 Penetration | Defines penetration, softening point, flash point, solubility, ductility |
| Europe (EN 12591) | 50/70 or 40/60 | Uses penetration grade bands (e.g., 50/70); includes wax content and RTFOT ageing |
| India (IS 73) | VG-30 / VG-40 (viscosity graded) | Shifted from penetration grading to viscosity grading; VG-40 ≈ 40/50 stiffness |
| China (GB/T 15180) | 50# / 70# / 90# | Number refers to penetration midpoint |
| UK (BS 3690) | 40/60 pen | Broader band; often used in surface dressing |
Practical implication: A buyer seeking "40/50 penetration" in a viscosity-graded market (e.g., India) may be offered VG-40, which is roughly equivalent in stiffness. Always verify the actual test results against your project specification rather than relying solely on the grade name.
Applications and Performance Data
40/50 penetration bitumen delivers superior rutting resistance in high-temperature environments. The following application breakdown is based on typical field performance:
| Application | Typical Dosage / Layer | Performance Note |
|---|---|---|
| Asphalt binder (heavy traffic) | 4.5–6.5% by mix weight | High stability, low rutting at 60°C |
| Airport runways | Wearing and base courses | Withstands high static and dynamic loads |
| Industrial floors | 5–7% by mix weight | Resists deformation under forklift traffic |
| Mastic asphalt | 10–14% by weight | Used in roofing and waterproofing |
| Waterproofing membranes | 40–60% in formulation | High softening point aids thermal stability |
| Joint and crack filler | As-is or blended | Good adhesion in hot climates |
Performance benchmarks (typical):
- Marshall Stability: 8–12 kN (at optimal binder content)
- Rutting depth at 60°C (wheel tracking): 2–5 mm per 10,000 cycles
- Dynamic modulus at 40°C: 50–150 MPa (frequency-dependent)
For projects where rutting has historically occurred with 60/70 or 80/100, switching to 40/50 can extend pavement service life by 20–40% in hot-climate conditions, based on comparative field studies.
Pricing, Packaging, and Logistics
40/50 penetration bitumen pricing is driven by crude oil benchmarks (Brent/Dubai), refinery availability, freight rates, and packaging. The table below summarizes typical cost and logistics parameters.
| Cost Factor | Typical Value |
|---|---|
| FOB price (USD/MT, bulk) | 380–520 |
| Drum price premium | +40–80 USD/MT |
| Flexitank / ISO tank premium | +50–90 USD/MT |
| Ocean freight (Middle East → Asia) | 30–70 USD/MT |
| Ocean freight (Middle East → West Africa) | 80–150 USD/MT |
| Port handling & documentation | 5–15 USD/MT |
| Lead time (bulk vessel) | 10–25 days |
| Lead time (container/drum) | 15–35 days |
Packaging options and suitability:
- Bulk (vessel): 1,000–30,000 MT; lowest unit cost; requires receiving port infrastructure
- ISO tanks: 20–24 MT per tank; suitable for smaller buyers; easy intermodal handling
- Flexitanks: 20–24 MT in a standard 20 ft container; economical for 100–500 MT orders
- Drums: 150–182 kg; 80–110 drums per 20 ft container (15–20 MT); ideal for remote sites without bulk handling
Payment and documentation:
- Payment terms: Irrevocable L/C at sight, T/T with 30% advance, or CAD
- Key documents: Bill of Lading, Commercial Invoice, Packing List, Certificate of Origin, COA, MSDS, Insurance Certificate
- Inspection: SGS/Intertek/Bureau Veritas at load port (typically 0.3–0.8% of cargo value)
Quality Control and Testing Checklist
Before accepting a shipment of 40/50 penetration bitumen, verify the following:
- Penetration test: 40–50 dmm at 25°C, 100 g, 5 s (ASTM D5)
- Softening point: 50–58°C (ASTM D36)
- Flash point: ≥ 250°C (ASTM D92)
- Solubility: ≥ 99.0% (ASTM D2042)
- Loss on heating: ≤ 0.5% (ASTM D1754)
- Retained penetration after heating: ≥ 60% of original
- Ductility at 25°C: ≥ 100 cm (ASTM D113)
- Density: 1.01–1.06 g/cm³ (ASTM D70)
Sampling protocol:
- Bulk vessel: Composite sample from at least 3 tank depths per compartment
- Drums: Random sampling from 5% of drums (minimum 3 drums)
- ISO tanks/flexitanks: Top, middle, and bottom samples recommended
- Retention: Keep sealed samples for 6–12 months in case of dispute
FAQ: 40/50 Penetration Bitumen
What is the penetration value of 40/50 bitumen?
The penetration value of 40/50 bitumen is 40–50 dmm (0.1 mm) when tested at 25°C with a 100 g load for 5 seconds per ASTM D5. This makes it harder and more rut-resistant than 60/70 or 80/100 grades.
What is the softening point of 40/50 penetration bitumen?
The softening point typically ranges from 50°C to 58°C per ASTM D36 (Ring & Ball method). A higher softening point indicates better resistance to deformation at high pavement temperatures.
What is the difference between 40/50 and 60/70 bitumen?
40/50 bitumen is harder, with a penetration of 40–50 dmm and viscosity of 300–500 Pa·s at 135°C, while 60/70 has a penetration of 60–70 dmm. 40/50 is preferred in hot climates and heavy-traffic roads; 60/70 suits temperate conditions.
How much does 40/50 penetration bitumen cost per ton?
Indicative FOB prices range from USD 380 to USD 520 per metric ton in bulk, depending on crude benchmarks, origin, and freight. Drum or flexitank packaging adds approximately USD 40–90 per ton.
What is the minimum order quantity for 40/50 bitumen?
Minimum order quantities typically start at 500 MT for bulk vessel shipments, 20–24 MT for ISO tanks or flexitanks, and 15–20 MT (80–110 drums) for containerized drum shipments.
Calculate Your 40/50 Bitumen Costs Instantly
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