Key Properties of Cutback Bitumen MC-70
| Property | Value |
|---|---|
| Kinematic Viscosity at 60°C | 70–140 cSt |
| Curing Type | Medium Curing (MC) |
| Solvent / Diluent | Kerosene (~38% by volume) |
| Base Bitumen | Penetration Grade 80/100 |
| Flash Point (Tag Open Cup) | 38°C minimum |
| Standard | ASTM D2028-97 (Rev. 2004) |
| HS Code | 2713.20.00 |
| Curing Time | 48–72 hours (ambient 20–30°C) |
ASTM D2028 Specification — Cutback Bitumen MC-70
| Property | Min | Max | Test Method |
|---|---|---|---|
| Kinematic viscosity at 60°C, cSt | 70 | 140 | ASTM D2170 |
| Flash point (tag open cup), °C | 38 | — | ASTM D3143 |
| Distillation — volume % of total distillate to 360°C | |||
| To 225°C | — | 20 | ASTM D402 |
| To 260°C | 20 | 60 | ASTM D402 |
| To 316°C | 65 | 90 | ASTM D402 |
| Residue from distillation to 360°C, vol% | 67 | — | ASTM D402 |
| Tests on Residue from Distillation | |||
| Viscosity at 60°C, cSt | 30 | 120 | ASTM D2170 |
| Penetration at 25°C, dmm | 120 | 300 | ASTM D5 |
| Ductility at 25°C, cm | 100 | — | ASTM D113 |
| Solubility in trichloroethylene, % | 99 | — | ASTM D2042 |
| Water, vol% | — | 0.2 | ASTM D95 |
MC-70 vs Other MC Grades — Comparison
| Grade | Viscosity at 60°C (cSt) | Curing Time | Primary Use |
|---|---|---|---|
| MC-30 | 30–60 | 24–48 hrs | Prime coat, dust control |
| MC-70 ✓ | 70–140 | 48–72 hrs | Prime coat, tack coat, surface dressing |
| MC-250 | 250–500 | 3–5 days | Cold mix, patching |
| MC-800 | 800–1600 | 5–7 days | Cold mix paving |
| MC-3000 | 3000–6000 | 7–14 days | Dense-graded cold mix |
FOB Price — Cutback Bitumen MC-70
Applications of Cutback Bitumen MC-70
Cutback Bitumen MC-70 is widely used across road construction and maintenance projects in Africa, the Middle East, and Asia where ambient temperatures allow effective kerosene evaporation. Its viscosity range of 70–140 cSt at 60°C makes it suitable for a broader range of applications than MC-30, particularly where slightly longer working time is needed.
| Application | Details |
|---|---|
| Prime Coat | Applied to granular base courses before asphalt overlay. Rate: 0.6–1.0 L/m² |
| Tack Coat | Bonding agent between existing pavement and new asphalt layer |
| Surface Dressing | Sprayed and covered with aggregate for protective wearing course |
| Dust Suppression | Binding loose surface particles on unpaved roads |
| Road Repair | Pothole patching and crack sealing in moderate-traffic roads |
| Waterproofing | Flat roof waterproofing membrane and adhesive layer |
Packaging & Shipping
| Packing Type | Capacity | Net Weight |
|---|---|---|
| New Steel Drum | 203 litres | 185 ± 5 kg |
| Reconditioned Steel Drum | 203 litres | 185 ± 5 kg |
| IBC Tank | 1,000 litres | ~900 kg |
| Flexi Tank / Bulk | 20,000–24,000 litres | On request |
Export Destinations
Zumrut International Kimya supplies Cutback Bitumen MC-70 to customers in East Africa (Kenya, Tanzania, Ethiopia, Uganda, Mozambique), West Africa (Nigeria, Ghana, Senegal, Ivory Coast), the Middle East (Iraq, Yemen, Jordan, Oman), South Asia (Bangladesh, Sri Lanka, Pakistan), and Southeast Asia (Indonesia, Vietnam, Philippines). Shipments depart from Iskenderun Port (Turkey) and Jebel Ali Port (UAE) with a typical lead time of 14–30 days.
Frequently Asked Questions — Cutback Bitumen MC-70
What is the difference between MC-30 and MC-70 cutback bitumen?
MC-70 has a higher kinematic viscosity (70–140 cSt at 60°C) compared to MC-30 (30–60 cSt at 60°C). This means MC-70 is slightly thicker and takes longer to cure (48–72 hours vs 24–48 hours). MC-70 is preferred when stronger film thickness is needed on the surface, such as in surface dressing, while MC-30 is preferred for prime coat on highly porous bases where deep penetration is required.
At what temperature should MC-70 be applied?
MC-70 is pumpable at ambient temperatures above 15°C without heating. For spray applications, moderate warming to 50–70°C improves atomisation and ensures even coverage. In climates below 10°C, heating to 60–70°C is recommended to achieve proper viscosity for spray distribution.
What solvent is used in Cutback Bitumen MC-70?
Kerosene is the diluent solvent used in MC-70, comprising approximately 38% of the blend by volume. After application, the kerosene evaporates over 48–72 hours, leaving the residual bitumen binder to bond with the surface. This distinguishes MC-70 from Rapid Curing grades (which use naphtha) and Slow Curing grades (which use fuel oil or diesel).
How long does MC-70 take to cure?
Under normal conditions (20–30°C ambient temperature and moderate wind), MC-70 reaches surface-dry condition in approximately 48–72 hours. Traffic should be kept off primed or dressed surfaces until kerosene has fully evaporated. Higher temperatures and air circulation accelerate the curing process.
Can MC-70 be used as a tack coat?
Yes, MC-70 is commonly used as a tack coat at diluted application rates of 0.2–0.4 L/m² to promote bonding between an existing asphalt or concrete surface and a new asphalt overlay. It performs well in this role due to its moderate viscosity and good adhesion to both old and new surfaces.
What is the prime coat application rate for MC-70?
The standard prime coat application rate for MC-70 is 0.6–1.0 litres per square metre, depending on the porosity and texture of the granular base. Denser or well-compacted bases may require lower rates, while highly porous or open-graded bases may require higher rates to achieve adequate penetration.
Related Products
Cutback Bitumen MC-30 |
Cutback Bitumen MC-250 |
Cutback Bitumen MC-800 |
Cutback Bitumen Hub |
Medium Curing Cutback Bitumen |
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