Asphalt 75/35 is an oxidized bitumen made by oxidizing petroleum asphalts without adding the catalyst. The Oxidized Bitumen 75/35 from Chemical Mine World has a high flash point, high softening point, and excellent melting stability. In order to produce Asphalt 75/35, penetration grade bitumen is air-blown. The process involves high temperatures, resulting in a much more penetration friendly material.
Oxidized Bitumen 75/35 manufactured by Chemical Mine World is made from petroleum bitumen, which is blown very hot with really hot air to produce bitumen 60/70. A 75/35 bitumen is specified as the value at the middle of the softening point acceptance criteria.
Blowing Asphalt is a solid or semi-solid material that becomes liquid when heated. A blown or oxidized bitumen grade is produced by passing air through soft bitumen under controlled temperature conditions. This process gives the bitumen more rubbery properties than penetration or hard grade bitumen's and a variety of uses in industrial applications.
Oxidized Bitumen 75/35 is produced by either Continuous or Staggered Blowing Process. Heated Penetration Grade Bitumen under controlled environment is blown with air which controls the Oil Content in the Bitumen while it oxidized. The different grades for suited applications produced are designated by two numbers to indicate the mid-points of their softening point and penetration ranges. Oxidized Bitumen 75/35 is based on petroleum bitumen which is made by blowing bitumen 60/70 by very hot air. In addition, the numbers relate to the midpoint of the material’s softening point and penetration respectively. The softening point value measured by Ring and Ball method as determined by ASTM D36. Also, the penetration value is in 1/10 mm as determined by IP 49 or ASTM- D5.
Oxidized Bitumen 75/35 Uses
- Blown asphalt 75/35 uses in the chemical, fuel, paints, lacquers, varnishes, paper-pulp-board, textile processing, road construction, pavement ,crack seal and repairmen, civil works, roofing, construction industries.
- Most of people use oxidized bitumen 75/35 in sealing and insulating buildings, adhesive, construction materials additive, dust-binding, coating, insulating and impregnating agent, make rubber and plastic products. The blown asphalt 75/35 products are for paving, roofing.
- Also used in asphalt based paints for corrosion protection of metals, in lining public works structures, adhesives in electrical laminates, base for synthetic turf. Typical uses for blown asphalt 75/35 include roofing, pipe coating, portland cement pavement, hydraulic applications, paint manufacturing
Application of Blown Asphalt 75/35
Blown Asphalt 75/35 grades are produced by passing air through soft bitumen under controlled temperature conditions. This process gives the bitumen more rubbery properties than penetration or hard grade bitumen and enables the product to serve a variety of uses in industrial applications. These grades are suitable for sealing saw cuts and joints where there is expected to be the minimum amount of moving in the joint. Their wide temperature range prevents bleeding in high-temperature applications. They can also be used for industrial applications such as pipe coating, roofing, waterproofing, flooring, mastics, sound damping, carpet backing, adhesive and electrical applications. Hard bitumen under controlled temperature conditions is widely used as an anti-slip layer compound in the piling industry, for the manufacture of roofing felts, the roofing and waterproofing industries, for sound dampening felts and under carriage sealant in the automotive industry, electric cable joint protection, joint filling compound, sealant compound, and many others. Also used in sealing saw cuts and joints where expected movements are minimum.
Technical Advantages of Blown Asphalt 75/35
- Durability
- Flexibility
- Water Resistant
- Chemical Stability
Compared to paving grade bitumen:
- Reduced temperature susceptibility
- Exhibits a more ‘solid’ nature at ambient temperatures
- High penetration index
Specifications of oxidized bitumen 75/35
| Bitumen 75/35 | Test method | Unit | Specification |
|---|---|---|---|
| Specific gravity @25/25 C | ASTM D70 | (Kg/m3) | 1.05 approx. |
| Penetration @ 25°c | ASTM D5 | mm/10 | 30/40 |
| Softening point °C | ASTM D36 | °C | 70/80 |
| Loss on heating(wt) % | ASTM D6 | Wt. % | 0.2 max |
| Flash point °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 |
Data sheet of oxidized bitumen 75/35