Bitumen Emulsion SS-1 and CRS-1 Comparison
Last updated: 2026-10-03
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Bitumen emulsion SS-1 (anionic slow-setting) and CRS-1 (cationic rapid-setting) are two different products for two different jobs. SS-1 costs $280–$420 per tonne FOB and is used for tack coats, fog seals, and slurry seal bases where slow curing and high dilution (up to 1:1 with water) are needed. CRS-1 costs $380–$520 per tonne FOB, cures in 15–45 minutes, and is designed for chip seals, surface dressings, and cold micro-surfacing where you need a fast bond to aggregate within the same shift.
What Is the Difference Between SS-1 and CRS-1 Bitumen Emulsion?
The core difference is setting speed and electrical charge. SS-1 is anionic and slow-setting; CRS-1 is cationic and rapid-setting. This single factor drives every other specification — storage, dilution, application window, and cost.
| Property | SS-1 (Anionic Slow-Setting) | CRS-1 (Cationic Rapid-Setting) |
|---|---|---|
| Emulsifier charge | Anionic (negative) | Cationic (positive) |
| Setting speed | Slow (4–24 hours to full cure) | Rapid (15–45 minutes) |
| Residual bitumen content | 57–62% | 60–65% |
| Typical dilution | Up to 1:1 with water | Usually 0–30% water only |
| Compatible aggregate | Limestone, dolomite, most siliceous | Siliceous (granite, quartz), crushed gravel |
| pH | 9–12 (alkaline) | 2–5 (acidic) |
| Storage stability | 3–6 months in sealed tanks | 2–4 months; sensitive to shear and pH drift |
| Price range (FOB) | $280–$420/t | $380–$520/t |
Key takeaway: SS-1 tolerates dilution and delays; CRS-1 demands precision and speed. If you mix them up, you either get a coating that never breaks (CRS-1 diluted and left too long) or a tack coat that fails to develop early strength before paving (SS-1 applied where rapid cure is required).
SS-1 Bitumen Emulsion: Applications, Specs, and Pricing
SS-1 (and its close relatives SS-1h, with harder base bitumen) is the workhorse of slow-setting, low-cost surface treatments. Its anionic chemistry means it mixes readily with water and mineral fillers, which makes it ideal for slurries and fog seals.
Typical applications:
- Tack coats — diluted 1:1 with water, applied at 0.2–0.4 L/m²
- Fog seals — neat or 30% dilution, 0.3–0.6 L/m²
- Slurry seal base binder — blended with aggregate and fillers
- Dust palliative and soil stabilization — high dilution (2:1 to 4:1)
- Prime coat substitute on stabilized bases
Specifications (ASTM D977 / D2397 equivalents):
| Parameter | SS-1 Requirement |
|---|---|
| Residue by distillation | ≥ 57% |
| Sieve test (retained on 850 µm) | ≤ 0.1% |
| Saybolt Furol viscosity @ 25°C | 20–100 s |
| Penetration of residue (25°C) | 100–200 dmm |
| Ductility of residue (25°C) | ≥ 40 cm |
| Storage stability, 24 h | ≤ 1% |
Pricing realities in 2024–2025: SS-1 trades $60–$110/tonne cheaper than CRS-1 because anionic emulsifiers (tall oil, rosin-based soaps) cost less than cationic surfactants (amine-based). Freight matters more than grade for most buyers — a 20-tonne ISO tank from a Gulf Coast refinery to West Africa runs $45–$75/tonne, which can exceed the grade price difference entirely.
Where SS-1 wins: budget-sensitive tack and fog work, contractors without heated storage, and projects using limestone aggregate (which bonds better with anionic emulsion).
CRS-1 Bitumen Emulsion: Applications, Specs, and Pricing
CRS-1 is engineered for speed and adhesion. The positive charge bonds electrostatically to negatively charged siliceous aggregates — the dominant aggregate type in granite-bearing regions. It breaks in 15–45 minutes under normal conditions (25°C, 50% RH), letting you open a chip seal to traffic the same day.
Typical applications:
- Chip seals / surface dressings — 1.1–1.6 kg/m² binder
- Micro-surfacing — as the binder phase
- Cold mix patching — rapid-turnaround pothole repair
- Prime coats on granular bases — where penetration and quick cure matter
- Rapid tack coats on milled surfaces
Specifications (ASTM D2397 / AASHTO M208):
| Parameter | CRS-1 Requirement |
|---|---|
| Residue by distillation | ≥ 60% |
| Sieve test | ≤ 0.1% |
| Saybolt Furol viscosity @ 50°C | 20–100 s |
| Penetration of residue (25°C) | 100–200 dmm |
| Ductility of residue (25°C) | ≥ 40 cm |
| Particle charge | Positive |
| Cement mixing test | ≤ 2% |
Pricing realities: CRS-1 sits at $380–$520/tonne FOB, driven by amine emulsifier costs (often $3–$6/kg versus $1.50–$3/kg for anionic systems) and tighter production tolerances. In tight-supply markets — think Q3 construction peaks — CRS-1 can spike 15–25% above its baseline while SS-1 stays flat.
Where CRS-1 wins: any project where you cannot wait for cure. A chip seal job doing 5,000 m²/day with CRS-1 can double output versus SS-1 because you don't lose the day waiting for break.
Head-to-Head Comparison Table: Cost, Cure, and Use Case
| Factor | SS-1 | CRS-1 | Winner for Cost | Winner for Speed |
|---|---|---|---|---|
| Price (FOB, $/t) | 280–420 | 380–520 | SS-1 | — |
| Cure time | 4–24 h | 15–45 min | — | CRS-1 |
| Dilution tolerance | Up to 1:1 | 0–30% | SS-1 | — |
| Aggregate compatibility | Limestone, dolomite | Siliceous, granite | Depends on source | Depends on source |
| Storage life | 3–6 months | 2–4 months | SS-1 | — |
| Tack coat rate | 0.2–0.4 L/m² | 0.25–0.5 L/m² | SS-1 | CRS-1 |
| Chip seal binder rate | Not recommended | 1.1–1.6 kg/m² | — | CRS-1 |
| Crew size needed | 3–5 | 4–6 (faster cycle) | SS-1 | — |
| Fuel/heating needs | Lower (ambient storage OK) | Moderate (keep 15–40°C) | SS-1 | — |
| Best-fit project | Fog seal, tack, slurry | Chip seal, micro-surface | — | — |
Cost-per-square-meter reality check (tack coat example):
- SS-1 at 1:1 dilution, 0.3 L/m²: effective binder cost ≈ $0.05–$0.08/m²
- CRS-1 at 0.3 L/m² neat: ≈ $0.11–$0.16/m²
So SS-1 is roughly half the material cost for tack — but if CRS-1 lets your paving crew start 2 hours earlier, the labor and equipment savings can wipe out that gap on a 10,000 m² job.
How to Choose: Decision Framework for Export Buyers
Use this 4-question filter before you place a container or ISO tank order:
1. What aggregate are you bonding to?
- Limestone/dolomite → SS-1 works and saves money
- Granite/quartz/siliceous → CRS-1, non-negotiable in most specs
2. How fast must you open to traffic?
- Same shift, chip seal → CRS-1
- Overnight or next day, low-traffic → SS-1
3. What's your storage and handling setup?
- Ambient tanks, long storage, high heat → SS-1
- Heated/agitated tanks, tight turnaround → CRS-1
4. What does your spec say?
- Many DOT and municipal specs mandate cationic (CRS-1/CRS-2) for surface treatments. If your spec says "cationic," you cannot substitute SS-1 regardless of price.
Export logistics snapshot:
| Factor | SS-1 | CRS-1 |
|---|---|---|
| Typical shipment size | 20–24 t ISO tank / flexitank | 20–24 t ISO tank |
| Shelf life in transit (ambient) | 3–6 months | 2–4 months |
| HS code | 2715.00 | 2715.00 |
| Recommended min. order | 20 t | 20 t |
| Lead time (FOB Gulf/Asia) | 10–18 days | 12–20 days |
Pro tip: If you're buying both grades, never share pumps or lines without flushing. Anionic and cationic emulsions coagulate on contact. A contaminated line can turn a $9,000 ISO tank into a $9,000 disposal problem.
FAQ: Bitumen Emulsion SS-1 vs CRS-1
Q1: Can I use SS-1 instead of CRS-1 for a chip seal?
No — SS-1 will not develop adequate early bond strength for chip seal, and it performs poorly with siliceous aggregate. Chip seals require rapid-setting CRS-1 or CRS-2 to hold chips before traffic. Using SS-1 risks chip loss and rework within days.
Q2: How much cheaper is SS-1 than CRS-1 per tonne?
SS-1 typically runs $280–$420/tonne FOB versus $380–$520/tonne for CRS-1, a gap of roughly $60–$110/tonne or 15–25%. That gap can widen in peak season when cationic emulsifier supply tightens.
Q3: How long does CRS-1 take to cure?
CRS-1 breaks in 15–45 minutes at 25°C and 50% relative humidity, and reaches full cure in 1–2 hours. Cold or humid conditions can stretch break time to 90 minutes or more, so plan application windows accordingly.
Q4: Which grade is better for tack coats?
SS-1 is usually the better economic choice for tack coats, especially when diluted 1:1 with water and applied at 0.2–0.4 L/m². CRS-1 is preferred for rapid tack on milled surfaces where you need to pave within the hour.
Q5: What happens if SS-1 and CRS-1 get mixed?
They coagulate immediately on contact because of opposite electrical charges, forming unusable lumps that clog lines and spray bars. Always use separate pumps, hoses, and tanks, and flush with water between grades if sharing equipment.
Calculate Your Exact SS-1 vs CRS-1 Cost Before You Buy
Grade price is only half the story — freight, dilution, application rate, and cure time decide your real cost per square meter. Before you commit to a 20-tonne order, run the numbers.
Use the 6Tar cost calculator to model SS-1 and CRS-1 side by side: enter your project area, application rate, dilution ratio, FOB price, and freight to destination. You'll get a landed cost per tonne, cost per square meter, and a break-even point showing how much faster CRS-1 must cure to justify its premium. It takes two minutes and can save you thousands on your next emulsion shipment.