Bitumen MC‑30 – Kinematic viscosity ≈ 30 – 60 cSt @ 60 °C. Ultra‑fluid mix that penetrates deeply into untreated aggregate bases; the industry’s first choice for prime coat on low‑dust, low‑traffic roads and for preparing surfaces ahead of a single‑surface treatment.

Bitumen MC‑70 – Viscosity ≈ 70 – 140 cSt @ 60 °C. Still highly workable at ambient temperatures but forms a slightly thicker film than MC‑30; widely used as a tack coat between binder and wearing courses or as a light prime coat where a faster curing time is needed than MC‑30 can provide.

Bitumen MC‑250 – Viscosity ≈ 250 – 500 cSt @ 60 °C. Medium‑bodied grade that balances penetration and film build‑up, lending itself to cold‑mix patching and surface dressing jobs that demand more residual binder without excessive solvent flash‑off.

Bitumen MC‑800 – Viscosity ≈ 800 – 1600 cSt @ 60 °C. Produces a robust residual layer ideal for penetration macadam and stockpile cold mixes; cures more slowly, giving crews extra working time in warm climates or large‑area patch programs.

Bitumen MC‑3000 – Viscosity ≈ 3000 – 6000 cSt @ 60 °C. The heaviest MC grade; builds a thick, durable film for high‑stress seal coats, heavy‑traffic patching, and dust suppression where maximum binder content and long open time are critical.

Rule of thumb: As the grade number rises, viscosity and residual binder content increase, solvent percentage falls, and curing speed slows—giving engineers a spectrum of options to match ambient temperature, traffic loading, and construction schedule.