Discharge Agent Rongalit C (Sodium Formaldehyde Sulfoxylate)
CAS Number: 149-44-0
Sodium formaldehyde sulfoxylate (Rongalit C, SFS) is the principal discharge printing agent used to destroy azo dye chromophores in dyed cotton fabric during high-temperature steaming, creating white or illuminated color discharge effects. It is mixed into thickened print pastes with or without discharge-resist dyes to produce classic discharge printed textiles. Widely used in woven cotton, denim overprint, and home textile discharge effects.
Technical Specifications
| appearance | White to off-white crystalline powder |
| moisture (%) | ≤2 |
| SFS assay (%) | ≥98 |
| pH (1% solution) | 6.5–7.5 |
| active content (%) | ≥98 |
| reducing power (meq/g) | ≥9.5 |
Applications
- White discharge printing on reactive-dyed cotton fabric
- Color discharge printing with illuminating dyes on cotton
- Denim overprint discharge effects for fashion garments
- Discharge printing of cotton terry towels and bedlinen
- Resist discharge printing for complex multicolor designs
Key Features
- Strong reducing power for complete discharge of reactive azo dyes
- Compatible with illuminating discharge dyes for vibrant color effects
- Stable in alkaline print paste at room temperature before steaming
- Produces sharp discharge outlines with no halo effect
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CAS Number
149-44-0
Category
Textile Dyeing AuxiliariesAvailability
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