Cutback Bitumen SC-70

General Definition of Cutback Bitumen SC-70

Cutback bitumen is bitumen that is mixed with petroleum solvents. The solvents are usually called diluents or distillate. A more volatile solvent used will increase the rate of curing of the bitumen as they evaporate faster. The curing rate of a cutback bitumen is the basis of their classification: rapid curing, medium curing and slow curing. Slow curing cutback bitumen uses low volatility solvents generally in the heavy distillate range.  Additionally, the amount of solvent used determines the viscosity of the cutback bitumen. 

Cutback Bitumen SC-70 is a slow curing cutback bitumen consisting of penetration grade bitumen blended with heavy solvent. They are often called road oils and are used primarily in road-mixing and dust-laying applications. Slow curing cutback bitumens are also used for stockpile patching mixes, plant-mixed with graded aggregates and occasionally for priming.

Our SC-70 Cutback Bitumen complies with the ASTM D2028-97 standards for construction and treatment of pavements. 

Uses of Cutback Bitumen SC-70

Common use of a slow curing cutback bitumens are for stockpile patching mixes. Cutback bitumen used in mixing with aggregare will usually contain an adhesion agent to assist in the coating of the aggregate surface. Another common use is as a prime coat and cold-applied as it don’t require any thinning and heating, thus saves time. Other than that SC-70 Cutback Bitumen is also applied to waterproof a surface, to plug voids and to coat and bond loose mineral particles.

Packing of Cutback Bitumen SC-70

Our packing options depends on our client’s needs. It can come in bulk (in tanker) or in new thick steel drums on pallet.

Specification of Cutback Bitumen SC-70
PropertiesSpecification limit Test method
MinMax
Kinematic viscosity at 60°C (140°F), mm²/s70140ASTM D2170
Flashpoint (Cleveland open cup), °C 60 —ASTM D92
Distillate test
Total distillate to 360°C (680°F), volume %—35ASTM D402
Solubility, %95— ASTM D2024
Kinematic viscosity on distillation residue at 60°C (140°F), mm²/s200 7000ASTM D2170
Asphalt residue
Residue of 100 penetration, %40— ASTM D243
Ductility of 100 penetration residue at 25°C (77°F), cm50— ASTM D113
Water, %—0.5 ASTM D95