Cutback RC 70 — Rapid-Curing Bitumen for Spray Sealing & Surface Treatment

Formulated with improved binder strength and faster curing, RC-70 is engineered for spray sealing and surface treatment applications that demand quick turnaround and durable performance.

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What Is Cutback RC-70 Bitumen?

Cutback RC-70 is a rapid-curing bitumen made by blending penetration-grade bitumen with a volatile petroleum solvent, giving it a medium viscosity that sits just above the RC-30 grade. This slightly slower evaporation rate improves binder retention while still curing quickly enough for time-sensitive surface work.

A kinematic viscosity of 70–140 mm²/s at 60°C allows RC-70 to be sprayed or applied at ambient temperatures while still bonding strongly to aggregates. Once the solvent evaporates, the residual bitumen forms a firm, durable film suited to surface dressing and tack coat work.

RC-70 is typically supplied to ASTM D2170 standards, with residue penetration between 80–120 and a negative spot test confirming solvent compatibility. This makes it a common choice for surface treatments, tack coats, and medium-traffic pavement maintenance where stronger adhesion is needed than RC-30 provides.

Black Rock RC 70 CutBack Bitumen

Essential Details

Description

  • Type
  • Cut Back Bitumen
  • Feed Stock
  • Penetration Bitumen and Petroleum Solvent
  • HS Code
  • 27150090
  • Spot Test
  • Negative
  • 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 customized based on customer request
  • Supply Capacity
  • 1000 MT/Month
  • Packing
  • -New Steel Drum -Jumbo Bag

RC-70 Specification

RC 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
  • -
  • -
  • Distillation – Total Distillate to 190 °C (374 °F)
  • ASTM D402
  • °C
  • 10
  • -
  • Distillation – Total Distillate to 260 °C (500 °F)
  • ASTM D402
  • vol.%
  • 50
  • –
  • Distillation – Total Distillate to 316 °C (600 °F)
  • ASTM D402
  • vol.%
  • 70
  • -
  • Residue from Distillation to 360 °C (680 °F)
  • ASTM D402
  • vol.%
  • 65
  • -
  • Penetration of Residue at 25 °C
  • ASTM D402
  • 0.1 mm
  • 80
  • 120
  • Ductility of Residue at 25 °C (77 °F)
  • ASTM D5
  • cm
  • 100
  • –
  • Spot Test
  • ASHTO T102
  • Negative

RC 70 MSDS

pdf

RC 70 Safety Data Sheet

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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.

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    Our faqs

    Frequently Asked Questions.

    Our RC-70 bitumen is a rapid-curing cutback grade designed for quick setting and strong adhesion in surface treatments and road maintenance works.

     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.