MC-70 Cutback Bitumen — High-Viscosity Rapid Prime & Tack Coat Binder

Our MC 70 bitumen is a rapid-curing cutback with very high viscosity, formulated to deliver exceptional adhesion, thick binder films, and long-lasting performance in spray sealing and high-stress road maintenance works.

Get a Quote

What Is Cutback MC 70?

Cutback MC 70 is a medium-curing cutback bitumen made by blending penetration-grade bitumen with moderately volatile solvents, giving it a kinematic viscosity of 70–140 mm²/s at 60°C. This controlled curing rate allows steady solvent evaporation and gradual binder set.

Its residue shows a penetration of 120–260 (0.1mm) and minimum ductility of 100cm at 25°C, giving it strong flexibility and adhesion once cured. A negative spot test confirms consistent, homogeneous quality.

MC 70 is commonly used for prime coats on granular bases, surface treatments, and road maintenance work. Compared to MC 30, it offers higher viscosity and slower curing, resulting in improved binder retention and stronger surface bonding.

Black Rock MC 70 CutBack Bitumen

Essential Details

Description

  • Type
  • Cut Back Bitumen
  • Other Name
  • MC 70 Prime Coat, MC 70 Asphalt
  • Feed Stock
  • Penetration Bitumen and Petroleum Solvent
  • HS Code
  • 27150090
  • Inspection
  • Included
  • Delivery Term
  • FOB-CFR-CIF
  • Production and Loading Period
  • Approximately 1 Month
  • Payment Term
  • TT Method FOB Delivery: 30% advance and balance against customs documents CFR/CIF Delivery: 30% advance and balance against B/L daft
  • Marking
  • Marking can be customised based on customer requests
  • Supply Capacity
  • 1000 MT/Month
  • Packing
  • New Steel Drum

MC 70 Specification

MC 70 CutBack Bitumen Specifications

Essential Details

Test Method

Unit

Min.

Max.

  • Kinematic Viscosity at 60 °C (140 °F)
  • ASTM D2170
  • mm²/s
  • 70
  • 140
  • Flash Point (Tag Open-Cup)
  • ASTM D3143
  • °C
  • 38
  • -
  • Distillation – Total Distillate to 190 °C (374 °F)
  • ASTM D402
  • vol.%
  • -
  • 20
  • Distillation – Total Distillate to 260 °C (500 °F)
  • ASTM D402
  • vol.%
  • 20
  • 80
  • Distillation – Total Distillate to 316 °C (600 °F)
  • ASTM D402
  • vol.%
  • 65
  • 80
  • Residue from Distillation to 360 °C (680 °F)
  • ASTM D402
  • vol.%
  • 65
  • -
  • Penetration of Residue at 25 °C
  • ASTM D402
  • 0.1 mm
  • 120
  • 260
  • Ductility of Residue at 25 °C (77 °F)
  • ASTM D5
  • cm
  • 100
  • –
  • Spot Test
  • ASTM D2042
  • Negative

MC 70 MSDS

pdf

MC 70 Safety Data Sheet

Download
Looking for Reliable Bitumen Supply?

Ready to Secure Your Next Bitumen Shipment?

Get a Quote

Our Packaging

We deliver bitumen in versatile, secure options: economical Jumbo Bags, robust steel Drums, or high-volume Bulk Containers (Bitutainers/Bituboxes).

Terms of Payment

Payment Terms for Smooth Transactions

TT Method

The buyer pays 30% advance, with the balance against B/L draft (CFR) or customs docs (FOB).

LC at Sight

100% irrevocable, non-transferable, confirmed LC at sight, subject to bank approval by Black Rock Bitumen.

Get in Touch for Bitumen Orders & Inquiries

    0

    Tons Supplied

    0

    Client Retention Rate

    0

    Specialized Bitumen Grades

    0

    Successful Shipments

    Our faqs

    Frequently Asked Questions.

    Our MC-70 bitumen is a medium-curing cutback grade engineered for controlled curing and strong bonding in prime and surface treatment applications.

    RC-70 is a rapid-curing cutback bitumen made by blending penetration-grade bitumen with volatile petroleum solvents, formulated to achieve medium viscosity and fast curing for road construction use.

    What is RC-70 used for?

     RC-70 is widely used for surface dressing and spray seals, tack coats, road maintenance works, and medium-traffic pavement applications.

    Per ASTM D2170, RC-70 has a kinematic viscosity at 60°C of 70–140 mm²/s, higher than RC-30, giving it a thicker binder film and stronger surface bonding.

    RC-70 has higher viscosity and a slower evaporation rate than RC-30, which improves binder retention and delivers stronger adhesion for spray sealing and surface treatment work.

    The penetration of RC-70's residue at 25°C ranges from 80 to 120 (in 0.1 mm units), tested per ASTM D402, indicating a durable yet workable binder after curing.

    Yes, RC-70 can be applied at ambient temperatures without heavy heating, making it efficient for fast-track road works and reducing energy costs on site.

     Black Rock Bitumen supplies RC-70 in new steel drums or jumbo bags, with a production capacity of approximately 1,000 MT per month and FOB, CFR, or CIF delivery terms.

    RC-70 should be stored in sealed containers away from heat and ignition sources, with proper ventilation maintained during handling due to its solvent content.