MC 70

MC 70

General information of cutback bitumen MC-70

Cutback Bitumen MC-70 is medium curing (MC) cut-back asphalt consisting of penetration grade asphalt cement and diluent or cutter of medium volatility. The diluent temporarily reduces the viscosity of the asphalt cement for ease of handling and application. After application, the diluent evaporates, leaving asphalt cement to perform its function. Cutback MC-70 use in Roofing – As a waterproofing membrane and as an adhesive to stick chippings onto a flat, horizontal roof to minimize the effects of weathering from the sun.
Cutback bitumen MC-70 is dissolved of bitumen in solvents of kerosene. In many countries, kerosene and other volatile petroleum-derived products are added as a cutter or cutback agent to bitumen to reduce (or cutback) the viscosity of the bitumen. The mixture obtained may be called cutback bitumen. The reduction in viscosity of the bitumen aids the construction of seal coats in road pavements as the softened mixture wets the chips more easily. The cutback agent evaporates from the seal coat, the cutback agent becoming a negligible component of the seal coat a few months after application. If significant amounts of the cutback agent remain in the seal coat an unwanted long-term softening effect may result.

About cutback bitumen MC-70

Our MC-70 Cutback Bitumen complies with cutback petroleum asphalts of the Medium-Curing type for use in the construction and treatment of pavements as per ASTM D2028-97 reapproved in 2004. Cutback Grade Bitumen is normally used in spraying and in some mixing applications.  Bitumen is penetration grade bitumen blended with a solvent such as kerosene, white spirit, gasoline, and naphtha, controlling the curing time.petroleum asphalts of the rapid curing type supplied by jey pasargad Co are petroleum grade bitumen manufactured from the fractional / vacuum distillation of crude oil blended with a solvent. perty which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature/ viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability, and application temperatures of bitumen.

Bitumen MC70 liquid solvent base

Bitumen MC70 products have been used many years in the maintenance and repair of road surfaces, and isolation but road surface is used much more widely than the other usage and named liquid asphalt MC70, commonly called “asphalt medium curing” or “tack oil” (which has carried the commercial designations: MC70)

Road surface by MC70

However, tack oil bitumen MC70 has many shortcomings making it less than an effective road surface repair product.In repairing pot holes or filling cracks in existing asphalt road surfaces, tack oil is strictly a “gluing” process or a “tacking” of new asphalt to the old. There is no homogeneous admixture of the new with the old asphalt.

How to use MC70 in roads.

Weather and climate conditions must be near “perfect” for application of tack oil, which at best allows for only a minimal time until replacement again is necessitated. Tack oil cannot be used in cold or wet weather or on wet surfaces. Also, tack oil repair of road surfaces requires a multiple highway crew to apply the asphalt and the use of expensive equipment. The bitumen MC70 must be pre-heated to 250 degrees F for 2-3 hours before application, then applied and the overlaying asphalt rolled or tamped in place to form a smooth surface.

MC70 bitumen using in Airport , Highway and helipads

Alternatively, a top dressing can be applied to provide a flexible, tough, abrasion resistant surface. The resultant surface functions as a wear course in which a further increase in the compressive and tensile strengths of the base course have been increased. Colors, such as green or black, may be added to the top dressing to yield an appearance which is aesthetically pleasing or functional. After curing of bitumen MC70, the dressing forms a surface suitable for moderate airport traffic or highway traffic, or helicopter touchdown areas.

Uses of cutback bitumen MC-70

Cutback agents are used to lower the viscosity of bitumen when it is applied as a primer to the surface of a road pavement aggregate base course or substrate. Kerosene is used as a bitumen cutback agent at different concentrations according to local conditions and requirements.
The cutback bitumen is ideal for prime coat and cold applied because of easy uses and no need to thinning and heating.
Cutback bitumen MC-70 consist of initial incorporation of asphalt into the surface of non-asphalt based course preparatory to any superimposed treatment of construction.
The cutback asphalt MC-70 applying to waterproofing of surfaces, plug capillary voids, coat and bond loose mineral particles.
Current common uses are in penetrating prime coats and in producing patching or stockpile mixtures. Cutback asphalt used in mixing with aggregate will usually contain an adhesion agent to assist in the coating of the aggregate surface.

Packing of cutback bitumen MC-70

This cutback bitumen bulk in the tanker and also in new steel and thick drum on the pallet to prevent all leak inside of the container.

Safety of cutback bitumen MC-70

Refer to Safety Data sheets before use.
Transport, use and store at the lowest temperature possible.
Eliminate all potential ignition sources during application.
Avoid breathing vapors. Avoid contact with skin.
Always wear appropriate PPE including heat protection when used hot.
DO NOT allow product or washings to enter stormwater or sewer systems.

Analysis and specification of bitumen MC70

property specification limit  Test method
Min Max
Kinematic viscosity at 60°C ,cST 70 140 ASTM D2170
Flashpoint(tag open cup), °C 38 —  ASTM D3143

Distillation test
Distillate, volume percent of total Distillate to 680°F (360°C)

to 437°F (225°C)
to 500°F (260°C)
to 600°F (316°C)
Residue from distillation to
680°F (360°C), percent volume by difference
 — 20


10 70
65 93
55 — 
Test on Residue from distillation test
Viscosity at 140°F (60°C) 30 120 ASTM D2170
Penetration 77°F (25°C) 100g,5s mm 120 300 ASTM D5
Ductility 77°F (25°C) 5cm/min cm 100 —  ASTM D113
Solubility in trichloroethylene % 99 —  ASTM D2042
Water, percent volume  — 0.2 ASTM D95

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