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3. Bitumen

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  • Penetration Grade 30/40

  • Penetration Grade 40/50

  • Penetration Grade 60/70

  • Penetration Grade 80/100

  • Penetration Grade 85/100

  • Penetration Grade 180/200

  • Oxidized Grade R90/15

  • Oxidized Grade 90/40

  • Oxidized Grade 95/25

  • Oxidized Grade 115/15

Penetration grade bitumen is manufactured from fractional distillation of crude oil. The long residue taken from crude oil distillation process, a mixture of high molecular weight hydrocarbons, is further distilled at reduced pressure in a vacuum distillation column to produce short residue. The short residue is the feedstock used in the manufacture of over ten different grades of bitumen. The viscosity of the short residue is a function of both the origin of the crude oil and the temperature and pressure in the vacuum column during processing. Penetration grade bitumen is specified by the penetration and softening point test. Designation is by penetration range only.

The majority of penetration grade bitumen produced is used in road construction for building roads and pavements with superior properties. Bitumen 30/40 is used in specialized applications like airport runway construction as this grade is harder than 60/70 grade. 40/50 & 60/70 bitumen is used in the manufacture of hot mix asphalt for bases and wearing courses. 60/70 grade is harder in comparison to 80/100 and is used mainly in construction of national highways and state highways. 80/100, 85/100 grade is most widely used in road construction and 150/200 bitumen is used in spraying and chip applications.

Oxidized/Blown Bitumen (Industrial Grade) grades are blown or oxidized bitumen which 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, 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.

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