Oxidized Bitumen
Blown / Oxidized Bitumen 90/15
A hard oxidized bitumen with a high softening point and low penetration, developed for waterproofing, coating, insulation and industrial compounding…
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Oxidized Bitumen
Blown / Oxidized Bitumen 85/25
A widely used oxidized bitumen grade combining high softening point with moderate penetration for waterproofing, roofing, coating and industrial formulations.
- Grade
- 85/25
- Specification Basis
- Oxidized-bitumen class specification / BS EN 13304 framework with ASTM physical test methods
- Product Group
- Oxidized Bitumen
Technical Product Data
Product Information
Blown / Oxidized Bitumen 85/25 is a controlled air-oxidized bitumen grade. Oxidation changes the binder structure, increasing softening point and reducing temperature susceptibility while retaining enough penetration for industrial processing and adhesion.
The 85/25 designation reflects the midpoint convention used for oxidized-bitumen grades: a softening-point range around 85°C and a penetration range around 25 dmm. Historical oxidized-bitumen specifications published by international technical bodies show the 85/25 class with a softening point of 80–90°C and penetration of 25±5 dmm.
Applications
- Roofing membranes and waterproofing compounds
- Pipe coatings and protective industrial coatings
- Mastics, joint fillers and sealants
- Adhesives and insulation compounds
- Industrial bituminous formulations requiring elevated softening point
URMEX oxidized-bitumen range: 85/25 and 90/15. 85/25 is softer and more penetrable than 90/15.
| Property | Test Method | Unit | Requirement | Note |
|---|---|---|---|---|
| Penetration at 25°C, 100 g, 5 s | ASTM D5 | dmm | 20–30 | 25 ± 5 dmm class range |
| Softening Point (Ring & Ball) | ASTM D36 | °C | 80–90 | 85°C nominal midpoint |
| Loss on Heating | ASTM D6 | % mass | Max. 0.2 | |
| Solubility | ASTM D2042 / equivalent contract method | % mass | Min. 99.5 | |
| Flash Point, Cleveland Open Cup | ASTM D92 | °C | Min. 250 | Common commercial minimum; buyer specification may require a higher value |
Specification limits are editable and should be aligned with the buyer’s purchase specification and the shipment Certificate of Analysis.
The core 85/25 penetration and softening-point ranges are consistent with published oxidized-bitumen class specifications. Additional properties such as flash point and solubility are commonly controlled by commercial TDS/contract requirements. All values are editable so the page can match the actual URMEX batch specification or buyer contract.
Packaging & Supply
Common export packing includes meltable/poly bags, kraft bags, cartons and steel drums. The optimal format depends on destination temperature, warehouse conditions and the customer’s melting/feeding equipment.
Handling & Storage
Use controlled, indirect heating and avoid temperatures above the safe handling limit defined by the SDS and plant procedure. Keep water away from hot bitumen and use thermal PPE with appropriate ventilation.
Buyer Questions
Frequently Asked Questions
What does 85/25 mean in oxidized bitumen?
The grade name follows the midpoint convention: softening point around 85°C and penetration around 25 dmm, normally represented by acceptance ranges of 80–90°C and 20–30 dmm.
What is Oxidized Bitumen 85/25 used for?
It is commonly used in roofing, waterproofing, pipe coating, mastics, sealants, insulation, adhesives and other industrial bituminous compounds.
Is 85/25 softer than 90/15?
Yes. 85/25 has a higher penetration range and a slightly lower softening-point range, making it less hard than 90/15.
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