Sodium Formaldehyde Sulfoxylate C Lumps/Powder


Basic Information

Other Names: SFS; Rongalite C; Sodium Formaldehyde Sulfoxylate                   

Molecular Formula: NaHSO2.CH2O.2H2O      

Molecular Weight: 154.12

CAS NO.: 6035-47-8

EINECS NO.: 205-739-4

H.S. CODE NO.: 28311020

Standard: HG/T2281-2006

Purity: 98% min.

Physicochemical Properties

1.Appearence: White lumps or powder

2.Melting Point: 64℃

3.Melting Heat: 54.84 KJ/mol (13.2KCal/mol)

4.Density: 1.8 g/cm3

5.Hygroscopic Point: Relative Humidity 60%

6.Stable Point: <50℃

7.Water Solubility: 500-600 g/l at 20 ℃ ± 0.5℃ (DECD 105)

Technical Specifications

SpecificationTesting Results
NaHSO2·CH2O Content%98% min.99.12%
State of Solution

Be soluble in water and appear

in clarification or microturbidity

Complete soluble

SulphideNot in darkNot in dark
Alkalinity as sodium carbonate3.0% max.1.5%
Cu & Mn5ppm max.3ppm

Packaging Types

                 50kg iron drum; 25kg bag or as per customers' requirement


Mainly used as a discharging agent, color-discharging agent, reductant in printing a dyeing industry.

Also used as an activating agent for production styrene-butadise rubber and synthetic resin.

Also used to decolourize and bleach some organic matters, for example: as a bleaching agent in synthetic rubber, sugar-making, and food industry.

Substituted for Sodium Hydrosulfite in some special cases.

Storage Information

Stored in a dry, cool and dark place. Protected from moisture and avoided exposure to direct sunshine. Don’t to let it be rained on. Be sure not to store it together with oxidant and acid, no presence of acidic vapour in storage.