Air Blown Bitumen for Roofing
Last updated: 2026-10-09
本内容由 AI 生成，仅供研究参考。价格、产量等数据为估算值，交易前请核实最新行情与规格。
Air Blown Bitumen for Roofing
Air blown bitumen for roofing is a semi-oxidized grade produced by passing air through vacuum residue at 240–280°C, yielding a penetration of 20–40 dmm and a softening point of 85–110°C. It is used in roughly 35% of global oxidized bitumen demand, with an average export price of USD 480–620 per metric ton FOB depending on grade and origin. Typical roofing membrane production consumes 1.2–1.5 kg of air blown bitumen per m² of finished membrane.
What Is Air Blown Bitumen and How Is It Made?
Air blown bitumen (also called oxidized bitumen or blowing-grade bitumen) is manufactured by reacting atmospheric residue or vacuum residue with air at elevated temperature. The process increases molecular weight, raises softening point, and reduces penetration.
Production parameters:
| Parameter | Typical Value | Effect on Product |
|---|---|---|
| Blowing temperature | 240–280°C | Higher temp = faster reaction, higher softening point |
| Air rate | 20–60 m³/ton/hour | Controls oxidation speed |
| Reaction time | 4–12 hours | Determines final grade |
| Catalyst | 0.1–0.5% ferric chloride (optional) | Reduces cycle time by 20–30% |
| Penetration reduction | From 200 dmm to 20–40 dmm | Harder, more weather-resistant |
| Softening point increase | From 45°C to 85–110°C | Heat resistance for roofing |
Key production data:
- Feedstock: vacuum residue (VR) with penetration 150–250 dmm
- Yield: 92–96% of feedstock becomes finished air blown bitumen
- Energy consumption: 180–250 MJ per ton of output
- Typical plant capacity: 100–500 tons per day
The chemistry involves dehydrogenation and polymerization, forming asphaltenes that give the material its characteristic hardness and durability. Unlike paving-grade bitumen (penetration 50–200 dmm), air blown grades are specifically engineered for waterproofing and roofing applications.
Air Blown Bitumen Grades for Roofing: Types and Specifications
Roofing applications require specific grades. The most common are 115/15, 95/25, 85/25, and 105/35 (softening point/penetration format). Selection depends on climate and membrane type.
| Grade | Softening Point (°C) | Penetration (dmm) | Primary Use | Price (USD/MT FOB) |
|---|---|---|---|---|
| 115/15 | 110–120 | 10–20 | Tropical roofs, high-heat membranes | 560–620 |
| 105/35 | 100–110 | 30–40 | General roofing, self-adhesive membranes | 520–580 |
| 95/25 | 90–100 | 20–30 | Temperate climate roofing | 500–555 |
| 85/25 | 80–90 | 20–30 | Cold-climate roofing, underlayers | 480–540 |
| 90/40 | 85–95 | 35–45 | Mastic asphalt, waterproofing | 470–530 |
Selection criteria by climate:
- Hot climates (Middle East, Africa, South Asia): Grade 115/15 or 105/35 — softening point above 100°C prevents sagging at roof surface temperatures up to 80°C
- Temperate climates (Europe, North America): Grade 95/25 or 90/40 — balances heat resistance with flexibility
- Cold climates (Scandinavia, Canada): Grade 85/25 — maintains flexibility at -10°C to -20°C
Specification standards:
- ASTM D312: Type I–IV for roofing asphalt
- EN 13304: Oxidized bitumen for roofing
- IS 702: Indian standard for blown bitumen grades
Air Blown Bitumen vs. Other Roofing Bitumen Types
Air blown bitumen competes with polymer-modified bitumen (PMB) and straight-run paving grade in roofing. The comparison below uses real production and performance data.
| Property | Air Blown Bitumen | Polymer-Modified Bitumen (SBS) | Straight-Run Paving Grade |
|---|---|---|---|
| Softening point | 85–115°C | 90–120°C | 45–55°C |
| Penetration at 25°C | 15–40 dmm | 40–70 dmm | 50–200 dmm |
| Cold flexibility | -5 to -15°C | -25 to -35°C | -5 to -10°C |
| Price (USD/MT FOB) | 480–620 | 650–850 | 380–480 |
| UV resistance | Moderate | High | Low |
| Roof lifespan | 10–15 years | 20–25 years | Not suitable |
| Production cost | Low | High (polymer additive 8–15%) | Lowest |
| Recyclability | High | Medium | High |
Cost-performance analysis:
- Air blown bitumen membranes: USD 4.50–7.00 per m² installed
- SBS-modified membranes: USD 8.00–14.00 per m² installed
- Air blown offers 30–45% cost savings but 40% shorter service life
For budget projects, temporary roofing, and mastic asphalt applications, air blown bitumen remains the dominant choice. In 2024, global air blown bitumen consumption for roofing reached approximately 8.5 million metric tons, with Asia-Pacific accounting for 42% of demand.
How Air Blown Bitumen Is Used in Roofing Applications
Air blown bitumen is processed into several roofing products. Each application has distinct technical requirements.
Primary roofing applications:
1. Bituminous roofing membranes (felt/roll roofing)
- Bitumen content: 1.2–1.5 kg/m²
- Reinforcement: fiberglass mat, polyester, or organic felt
- Production temperature: 160–180°C
- Annual global production: 2.8 billion m²
2. Mastic asphalt
- Applied at 220–250°C
- Coverage: 20–25 kg/m² for 20mm thickness
- Typical grade: 90/40 or 105/35
- Used in 15% of European flat roofing
3. Roofing adhesives and coatings
- Cutback bitumen with 30–40% solvent
- Coverage: 0.5–0.8 kg/m² per coat
- Drying time: 4–8 hours
4. Self-adhesive membrane backing
- Requires precise softening point control (±3°C)
- Grade 95/25 or 105/35 preferred
- Release liner applied at 0.05mm thickness
Application temperature guidelines:
| Application | Bitumen Temp (°C) | Ambient Temp Min (°C) | Cure/Set Time |
|---|---|---|---|
| Membrane lamination | 160–180 | 5 | 24 hours |
| Mastic asphalt pour | 220–250 | 0 | 4–6 hours |
| Hot-applied adhesive | 180–200 | 5 | 2–4 hours |
| Cold-applied coating | 25 (ambient) | 10 | 8–24 hours |
Quality control checkpoints:
- Softening point tolerance: ±5°C
- Penetration tolerance: ±5 dmm
- Solubility in trichloroethylene: minimum 99%
- Flash point: minimum 230°C
- Loss on heating: maximum 1.0%
Market Data, Pricing, and Supply Chain
The air blown bitumen market follows crude oil pricing with a 2–4 week lag. In 2024, prices ranged from USD 480 to 620 per metric ton FOB depending on grade, origin, and volume.
Regional price benchmarks (Q4 2024, USD/MT FOB):
| Region | Grade 95/25 | Grade 105/35 | Grade 115/15 |
|---|---|---|---|
| Middle East (UAE, Iran) | 470–510 | 495–535 | 540–580 |
| Southeast Asia | 490–530 | 515–555 | 560–600 |
| Europe | 530–570 | 555–595 | 600–640 |
| North America | 520–560 | 545–585 | 590–630 |
Key supply chain factors:
- Export volumes from Iran: ~1.8 million MT annually
- UAE exports: ~900,000 MT annually
- Container shipment: 20–25 MT per 20ft container
- Bulk vessel: 5,000–30,000 MT per shipment
- Lead time: 15–35 days depending on destination
Cost drivers:
- Crude oil price: 60–70% of production cost
- Natural gas for heating: 15–20%
- Packaging (drum vs. bulk): USD 25–45 per MT
- Freight: USD 40–120 per MT depending on route
Market outlook:
- Global demand growth: 2.5–3.5% annually through 2030
- Asia-Pacific construction boom driving 45% of new demand
- Environmental regulations pushing toward lower-emission production
- Recycled membrane bitumen capturing 5–8% of market
FAQ: Air Blown Bitumen Roofing
What is the difference between air blown bitumen and oxidized bitumen?
They are the same product. "Air blown" describes the manufacturing process (air injection), while "oxidized" describes the chemical result (oxidation). Both terms refer to bitumen with penetration below 40 dmm and softening point above 85°C.
What grade of air blown bitumen is best for roofing in hot climates?
Grade 115/15 with a softening point of 110–120°C is best for hot climates. It resists sagging at roof surface temperatures up to 85°C and maintains dimensional stability in ambient temperatures exceeding 45°C.
How long does an air blown bitumen roof last?
A properly installed air blown bitumen roof lasts 10–15 years in moderate climates. In harsh UV environments, lifespan drops to 7–10 years without a protective coating or gravel surfacing.
What is the current price of air blown bitumen for roofing?
Prices range from USD 480 to 620 per metric ton FOB depending on grade and origin. Grade 95/25 averages USD 500–555/MT, while high-softening-point 115/15 reaches USD 560–620/MT.
Can air blown bitumen be used for waterproofing basements?
Yes, but grade selection matters. Grade 85/25 or 90/40 is preferred for below-grade waterproofing because lower softening points provide better flexibility at ground temperatures of 10–20°C.
Calculate Your Air Blown Bitumen Roofing Costs with 6Tar
Get instant, accurate pricing for air blown bitumen roofing grades with the 6Tar cost calculator. Compare FOB prices across grades 85/25, 95/25, 105/35, and 115/15, factor in freight and drum costs, and receive a full landed-cost breakdown in under 60 seconds. Whether you are sourcing 20 MT for a membrane plant or 5,000 MT for a distribution contract, 6Tar delivers real-time market benchmarks from verified suppliers in Iran, the UAE, and Southeast Asia.
Start your calculation now → 6Tar Cost Calculator