Sodium Carbonate (Fixation Alkali for Reactive Dye)
CAS Number: 497-19-8
Dense soda ash (sodium carbonate, Na2CO3) is the standard fixation alkali used in reactive dye exhaust and pad dyeing of cotton. It raises the dyebath pH to 10.5–11.5, activating the hydroxyl groups on cellulose fiber for covalent bonding with reactive dye groups. Widely used in both exhaustion (adding at 50°C+) and continuous pad-steam (pre-padded) processes.
Technical Specifications
| Fe (ppm) | ≤10 |
| NaCl (%) | ≤0.10 |
| Na2CO3 (%) | ≥99.2 |
| NaHCO3 (%) | ≤0.5 |
| appearance | White powder or granules |
| active content (%) | ≥99.2 |
Applications
- Fixation alkali in reactive dye exhaust dyeing of cotton
- Pad-steam continuous reactive dyeing fixation
- Cold pad-batch (CPB) fixation alkali for reactive dyes
- Reactive printing paste alkali for cotton screen printing
- Alkaline scouring and pre-treatment of cotton and viscose
Key Features
- Industry standard alkali for reactive dye fixation globally
- Milder than NaOH, reducing risk of fiber damage in sensitive processes
- Dense grade reduces dusting and improves handling safety
- Reliable global supply with consistent quality and competitive pricing
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CAS Number
497-19-8
Category
Textile Dyeing AuxiliariesAvailability
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