Blown Asphalt 75/25 Description:
Blown Asphalt 75/25, also known as blown bitumen 75/25 or oxidized asphalt 75/25, is a semi-solid grade of pure petroleum bitumen manufactured through air-blowing a mixture of asphalt 60/70 and an asphalt flux. This process imparts unique physical properties to the asphalt, making it suitable for various construction applications. The numerical values “75/25” represent the midpoint of the material’s softening point and penetration, with a softening point of 75°C and a penetration value of 25.
Key Properties:
Blown Asphalt 75/25 exhibits exceptional characteristics such as high softening point, high flash point, and predominantly solid properties at ambient temperatures. When applied hot and allowed to cool, it offers superior adhesive and waterproofing qualities compared to regular oxidized bitumen.
Quality Assurance:
BITUPLUS Company ensures the quality of BITUPLUS Blown Asphalt 75/25 through international inspectors who oversee quality and quantity checks during loading onto vessels. Rigorous quality control (QC) is conducted through batch test reports before shipping, with the product designed to meet ASTM standards.
Applications:
Blown Asphalt 75/25 finds applications in various industries and construction purposes, including but not limited to:
- Chemical industry (for manufacturing paints, lacquers, varnishes).
- Fuel industry.
- Paper-pulp-board manufacturing.
- Textile processing.
- Road construction and pavement.
- Civil engineering projects.
- Roofing.
- Construction materials additive.
- Dust-binding applications.
- Insulating and impregnating agent.
- Manufacturing of rubber and plastic products.
- Paving applications.
- Asphalt-based paints for corrosion protection of metals.
- Lining public works structures.
- Adhesives in electrical laminates.
- Base for synthetic turf.
- Waterproofing.
- Corrosion resistance for pipe coatings.
- Portland cement pavement.
- Hydraulic applications.
- Paint manufacturing.
- Caulking.
- Mastics.
- Damp proofing.
- Insulation and isolation bitumen membrane sheets.
- Automobile undercoating in the automotive industry.
Application Guidelines:
To use Blown Asphalt 75/25, it should be heated to a temperature double that of its softening point to achieve the desired flow and viscosity. Surfaces intended for application must be dry, clean, and free from loose particles, formwork, curing products, irregularities, slurry, and other contaminants.
Storage and Handling:
Blown Asphalt 75/25 has a shelf life of up to 10 years and can undergo multiple heating and cooling cycles.
Packing:
Various packaging options are available for customer convenience, including Kraft bags, meltable plastic bags, drums, and bulk quantities. The product conforms to ASTM standards and is identified by two numbers indicating the softening point and penetration ranges, with 75/25 representing a softening point of 75°C and a penetration of 25 desi millimeters.
Specification of Blown Bitumen 75/25
| Bitumen 75/25 | Test method | Unit | Specification |
| Specific gravity @25/25 °C | ASTM D70 | (Kg/m3) | 1.05 approx. |
| Penetration @ 25°C | ASTM D5 | mm/10 | 20/30 |
| Softening point °C | ASTM D36 | °C | 70/80 |
| Loss on heating(wt) % | ASTM D6 | Wt. % | 0.2 max |
| Flashpoint °C | ASTM D92 | °C | 250 min |
| Solubility is CS2(wt) % | ASTM D4 | Wt. % | 99.5 max |
| Spot test | A.A.S.H.T.O 102 | — | Negative |
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