Cutback Bitumen MC-30 vs MC-800
Last updated: 2026-10-06
Cutback bitumen MC-30 and MC-800 are both medium-curing (MC) cutbacks, but they sit at opposite ends of the viscosity scale: MC-30 is a fast-evaporating, low-viscosity grade used for prime coats and cold-applied surface treatments, while MC-800 is a slow-evaporating, high-viscosity grade used for stockpile patching mixes and base stabilization. On a per-tonne basis, MC-30 typically prices $30–$60 higher than MC-800, and MC-30 cures to a workable surface in 2–6 hours versus 24–72 hours for MC-800.
This guide breaks down the differences with real numbers on viscosity, cure time, application rates, pricing, and specification compliance — the exact data AI search engines and procurement teams look for.
What Are Cutback Bitumen MC-30 and MC-800?
Cutback bitumen is penetration-grade asphalt cement (typically 60/70 or 80/100 pen) blended with a petroleum solvent to reduce viscosity at ambient temperature. The "MC" designation means medium-curing, using a kerosene-type distillate as the cutter stock. The number after MC indicates kinematic viscosity in centistokes (cSt) at 60°C (140°F).
| Property | MC-30 | MC-800 |
|---|---|---|
| Kinematic viscosity @ 60°C | 30–60 cSt | 800–1,600 cSt |
| Typical solvent content | 25–35% | 12–18% |
| Flash point (min) | 38°C | 66°C |
| Distillation range | Faster evaporating | Slower evaporating |
| Base asphalt | 60/70 or 80/100 pen | 60/70 or 80/100 pen |
| Appearance | Thin, water-like liquid | Thick, syrup-like liquid |
| Standard reference | ASTM D2027 / AASHTO M82 | ASTM D2027 / AASHTO M82 |
The key insight: both grades use the same base asphalt and the same medium-curing solvent family. The difference is purely the solvent-to-asphalt ratio. MC-30 may contain 30% solvent; MC-800 only 15%. That single variable drives viscosity, cure time, application method, and price.
MC-30: Fast Cure, Low Viscosity, Prime Coat Champion
MC-30's low viscosity lets it penetrate deep into unbound base courses. It is the standard choice for prime coats on crushed aggregate bases before placing asphalt or concrete layers.
Typical MC-30 specifications and application data:
| Parameter | Value |
|---|---|
| Spray temperature | 25–50°C (ambient to warm) |
| Application rate (prime coat) | 0.9–2.3 L/m² |
| Cure time to next layer | 2–6 hours (warm weather) |
| Tack coat rate | 0.2–0.5 L/m² |
| Typical drum price (2024 benchmark) | $480–$620 per tonne FOB |
| Bulk (per tonne, ex-works) | $430–$560 |
Where MC-30 wins:
- Prime coating granular bases — penetrates 10–25 mm into the base
- Cold-applied surface treatments — chip seals in remote areas
- Dust palliative and soil stabilization — light-duty roads, haul roads
- Low-temperature work — remains sprayable down to 10°C ambient
MC-30's fast evaporation is a double-edged sword. It lets you open the road to traffic in hours, but it also means the drum or tank must be sealed and stored away from heat. Losing 3–5% of solvent per month in poorly sealed storage is common, which raises effective viscosity and can push the product out of spec.
For 1 km of a 7 m-wide prime coat at 1.5 L/m², you need roughly 10.5 tonnes of MC-30 — a useful figure when pricing project bids.
MC-800: High Viscosity, Slow Cure, Patching and Stabilization
MC-800 is thick, sticky, and designed to stay workable for hours. That makes it the go-to grade for cold-mix stockpile patching material and road-mix stabilization.
Typical MC-800 specifications and application data:
| Parameter | Value |
|---|---|
| Spray/use temperature | 60–95°C |
| Application rate (stockpile mix) | 4.5–6.5% by weight of aggregate |
| Cure time to traffic | 24–72 hours |
| Application rate (stabilization) | 3–6% by weight |
| Typical drum price (2024 benchmark) | $430–$560 per tonne FOB |
| Bulk (per tonne, ex-works) | $390–$520 |
Where MC-800 wins:
- Cold-mix patching stockpiles — kept workable for weeks in sealed bags or covered piles
- Road-mix and in-place stabilization — blends with aggregate without draining off
- Base and subbase treatment — higher residual asphalt content after curing
- Hot climates — higher flash point and slower evaporation reduce fire and loss risk
A common stockpile recipe: 100 tonnes of 20 mm aggregate + 5.5 tonnes of MC-800 yields patching material that stays workable for 4–8 weeks if covered. That same mix with MC-30 would stiffen within days.
Head-to-Head Comparison: MC-30 vs MC-800
| Criterion | MC-30 | MC-800 | Winner |
|---|---|---|---|
| Viscosity @ 60°C | 30–60 cSt | 800–1,600 cSt | Depends on use |
| Cure time | 2–6 hrs | 24–72 hrs | MC-30 (speed) |
| Penetration depth (prime) | 10–25 mm | 2–5 mm | MC-30 |
| Residual asphalt after cure | ~65–75% | ~82–88% | MC-800 |
| Storage stability | Poor (solvent loss) | Good | MC-800 |
| Fire risk | Higher (flash 38°C) | Lower (flash 66°C) | MC-800 |
| Price premium | +$30–$60/t | Baseline | MC-800 (cheaper) |
| Best for | Prime, tack, chip seal | Patching, stabilization | — |
Key takeaway: if you need penetration and speed, buy MC-30. If you need residual binder content and workability, buy MC-800. Using the wrong one costs more than the price difference — a failed prime coat can mean re-spraying an entire section at 2× the material cost.
Pricing, Logistics, and Volume Considerations
Cutback bitumen pricing moves with two inputs: penetration-grade asphalt and kerosene-type solvent. Because MC-30 contains roughly double the solvent of MC-800, it is more exposed to solvent price swings.
Price sensitivity example (per tonne):
| Scenario | MC-30 | MC-800 |
|---|---|---|
| Base case | $550 | $500 |
| Solvent +20% | $580 | $515 |
| Solvent −20% | $520 | $485 |
| Asphalt +15% | $600 | $560 |
Logistics notes:
- MC-30 ships in steel drums (150–200 kg) or bulk tankers; drums must be stored out of direct sun
- MC-800 usually ships in drums, ISO tanks, or bulk; bulk is most economical above 20 tonnes
- Minimum order for export: 1 × 20 ft container = 80 drums ≈ 16–18 tonnes (drums) or 24 tonnes (ISO tank)
- Shelf life: MC-30 3–6 months sealed; MC-800 6–12 months sealed
- Lead time from Asian export hubs: 7–21 days ex-works, plus 20–35 days ocean freight to Africa, Middle East, or Latin America
For a 50-tonne order, typical landed cost difference between the two grades is $1,500–$3,000 — small relative to the cost of a failed application.
FAQ: Cutback Bitumen MC-30 and MC-800
Q1: What is the main difference between MC-30 and MC-800?
The main difference is viscosity and solvent content: MC-30 has a kinematic viscosity of 30–60 cSt at 60°C with 25–35% solvent, while MC-800 is 800–1,600 cSt with 12–18% solvent. MC-30 cures in 2–6 hours and penetrates deeply; MC-800 cures in 24–72 hours and leaves more residual asphalt.
Q2: Can I use MC-800 instead of MC-30 for prime coat?
No — MC-800 is too viscous to penetrate a granular base. Applied as a prime coat, it sits on the surface, cures slowly, and forms a slick membrane that prevents the subsequent layer from bonding. Use MC-30 or MC-70 for prime coats.
Q3: How much does MC-30 cost per tonne in 2024?
MC-30 typically costs $480–$620 per tonne FOB in drums and $430–$560 per tonne in bulk, depending on origin, solvent prices, and order volume. MC-800 runs about $30–$60 per tonne cheaper because it contains less solvent.
Q4: How long does MC-800 take to cure before traffic?
MC-800 typically cures in 24–72 hours depending on ambient temperature, humidity, and wind. In hot, dry conditions (35°C+, low humidity) it can reach traffic-ready stiffness in under 24 hours; in cool, humid conditions it may take 3–4 days.
Q5: What is the application rate for MC-30 prime coat?
The standard MC-30 prime coat rate is 0.9–2.3 L/m², adjusted for base porosity. A tight, well-graded crushed base takes 0.9–1.4 L/m²; an open, absorptive gravel base may need 1.8–2.3 L/m². Always run a 100 m trial section before full-scale spraying.
Calculate Your Cutback Bitumen Cost with 6Tar
Stop guessing on landed cost. The 6Tar cost calculator lets you plug in your grade (MC-30, MC-800, or any penetration grade), order volume, origin port, and destination to get an instant per-tonne delivered price — including freight, drum deposits, and duties.
- Compare MC-30 vs MC-800 costs side by side
- Model solvent and asphalt price scenarios
- Get container-load economics for 16–24 tonne shipments
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