Sodium Thiocyanate Set Time Accelerator
CAS Number: 540-72-7
Sodium thiocyanate is a highly effective chloride-free accelerator for Portland cement concrete, accelerating hydration and improving early compressive strength, particularly in cold-weather conditions. It is commonly used as a component in multi-component non-chloride accelerator systems and can achieve comparable performance to calcium chloride without the associated corrosion risks. Typical dosage is 0.5–2% by cement weight.
Technical Specifications
| pH | 5.5-7.0 |
| appearance | White crystalline powder |
| purity (%) | 98±1 |
| iron content (ppm) | ≤10 |
| moisture content (%) | ≤0.5 |
Applications
- Cold-weather concrete as non-chloride alternative to CaCl2
- Multi-component admixture formulations for early strength
- Reinforced concrete requiring chloride-free acceleration
- Shotcrete in underground construction
- Oil-well cementing slurries requiring controlled acceleration
Key Features
- Non-chloride formula eliminates reinforcement corrosion risk
- High effectiveness comparable to chloride-based accelerators
- Excellent compatibility in multi-component admixture blends
- Stable performance over a wide temperature range
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