Ammonium Sulfate (pH Buffer for Reactive Dyeing)
CAS Number: 7783-20-2
Technical-grade ammonium sulfate is used in reactive dye exhaust dyeing as a mild pH buffer and slow-release alkali source, providing controlled dye exhaustion and fixation. When heated, it hydrolyzes to release ammonia and sulfuric acid, gradually lowering bath pH to promote reactive dye fixation in a more controlled manner than direct alkali addition. Also used as a diluent and anti-migration agent in disperse dye printing.
Technical Specifications
| appearance | White crystalline powder |
| moisture (%) | ≤0.5 |
| N content (%) | ≥21.0 |
| Fe content (ppm) | ≤10 |
| pH (10% solution) | 4.5–5.5 |
| active content (%) | ≥99.0 |
Applications
- pH control in reactive dye exhaust dyeing of cotton
- Acid dye dyeing of wool and nylon for pH buffering
- Slow-release fixation buffer in pad-dry-cure reactive processes
- Diluent and anti-migration additive in disperse dye printing pastes
- pH adjustment in dyeing processes requiring gradual acidification
Key Features
- Provides controlled pH reduction for reproducible dyeing results
- Low cost commodity chemical with reliable supply chain
- Prevents sudden pH shock that can cause unlevel dyeing
- Dual function as pH buffer and leveling agent in acid dye processes
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CAS Number
7783-20-2
Category
Textile Dyeing AuxiliariesAvailability
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