Difference Between 60/70 and 85/100 Bitumen in Asphalt Paving
Difference Between 60/70 and 85/100 Bitumen
Selecting the right bitumen grade is crucial for road durability and performance. In Iran and many global markets, 60/70 and 85/100 are two common penetration-grade bitumens — but they serve very different purposes. Confusing them can lead to premature road failure. This guide explains the key differences to help contractors, engineers, and buyers make the right choice.
What Is 60/70 Bitumen?
60/70 bitumen is a semi-hard grade that meets standards like ISIRI 2881 or ASTM D946. It has a penetration value of 60–70 dmm at 25°C and is ideal for:
- Highways, main roads, and high-traffic urban areas
- Hot and moderate climates (e.g., Tehran, Ahvaz, Shiraz)
- Projects requiring resistance to rutting under heavy loads
Its higher stiffness at elevated temperatures ensures long-term stability during summer months.
difference between 60/70 and 85/100
What Is 85/100 Bitumen?
85/100 bitumen is a softer grade with greater flexibility at low temperatures. It’s suitable for:
- Local streets and low-traffic roads
- Cold regions (e.g., Ardabil, mountainous zones)
- Winter-time paving projects
However, in warm weather, it may become too soft, leading to surface deformation and reduced pavement life.
Quick Comparison: 60/70 vs. 85/100 Bitumen
| Property | 60/70 Bitumen | 85/100 Bitumen |
|---|---|---|
| Hardness | Semi-hard | Softer |
| Optimal Temperature Range | 25–45°C (77–113°F) | 10–35°C (50–95°F) |
| Best For | Heavy traffic | Light to moderate traffic |
Which Bitumen Grade Is Best ?
Tehran’s climate — with hot summers and mild winters — makes 60/70 bitumen the standard choice for most paving projects. Municipal and highway authorities almost exclusively specify 60/70 grade due to its proven performance under heat and traffic stress.
85/100 bitumen is only recommended in Tehran if:
- The project is in cooler suburbs (e.g., Rudhen or Fasham), or
- Paving is scheduled during winter months.
Get Certified 60/70 Bitumen in Tehran
As a trusted supplier of standard 60/70 bitumen in Iran, we offer:
- Bitumen compliant with ISIRI 2881 and lab-tested
- Fast delivery across all districts of Tehran
- Official invoicing for corporate and government contracts
- Special pricing for contractors and asphalt plants
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Submit your request via our contact form.
