Sodium formaldehyde sulfoxylate dihydrate
CAS 6035-47-8
EC 611-965-8
Formula CH4O3S.2H2O.Na
MW 176.1 g/mol
Salts & Minerals Textile, Leather & PaperPulp & Paper Bleaching & Whitening
Description
Sodium Formaldehyde Sulfoxylate Dihydrate (CAS 6035-47-8) is a sodium salt of formaldehyde and sulfurous acid, commercially known under the trade names Rongalit, Rongalite, and Rongalit C. It carries no assigned E-code and is registered under EC number 611-965-8. It is supplied as a white crystalline powder.
In textile processing, it functions as a reducing bleach, breaking chromophoric bonds in dyes and pigments to discharge colour from fabric without fibre degradation. In leather and pulp and paper production, it reduces oxidised compounds and removes residual colour from substrates by donating electrons under mildly alkaline conditions.
This product is available in technical grade and is subject to REACH registration requirements within the European Union. It is classified under HS code 28311000 for customs purposes. Packaging formats vary by supplier; procurement teams should confirm available pack sizes and SDS documentation prior to ordering.
In textile processing, it functions as a reducing bleach, breaking chromophoric bonds in dyes and pigments to discharge colour from fabric without fibre degradation. In leather and pulp and paper production, it reduces oxidised compounds and removes residual colour from substrates by donating electrons under mildly alkaline conditions.
This product is available in technical grade and is subject to REACH registration requirements within the European Union. It is classified under HS code 28311000 for customs purposes. Packaging formats vary by supplier; procurement teams should confirm available pack sizes and SDS documentation prior to ordering.
Physical Properties
| Melting Point | 64-68 °C(lit.) |
| Density | 1.8 g/cm3 (20℃) |
| Appearance | white crystalline powder |
| Color | White to Almost white |
| Form | powder to crystal |
| Water Solubility | H2O: 50mg/mL, clear, colorless |
| Vapor Pressure | 2.68 hPa (20 °C) |
| pH | 9.5-10.5 (100g/l, H2O, 20℃) |
Safety & Handling (Learn More)
Warning GHS08
H
H341H361
P
P203P280P318P405P501
Trade & Regulatory
| HS Code | 28311000 |
| WGK (Germany) | 3 |
Other Names
Sodium hydroxymethanesulfinate dihydrateSFSRONGALITRONGALITERongalit CRONGALITE CRONGALITE DIHYDRATEFORMALDEHYDE SODIUM SULFOXYLATEFORMALDEHYDE SULFOXYLATE SODIUM
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