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LC5406 Sodium dithionite
technical grade


Order number Packaging Quantity Price €
AC32406 Metal can 1 kg Inquire
AC32406 Steel drum 50 kg Inquire


Product information
Synonyms Sodium hydrosulfite, Sodium hypodisulfite
Hill Formula Na2O4S2
Chemical formula Na2S2O4
HS Code 2831 10 00
EC number 231-890-0
Molar mass 174.11 g/mol
EC index number 016-028-00-1
CAS number 7775-14-6


Chemical and physical data
Ignition temperature >200 °C DIN 51794
Solubility ca.250 g/l (20 °C) (slow decomposition)
Melting point ca.100 °C (decomposition)
Molar mass 174.11 g/mol
Density 2.5 g/cm3 (20 °C)
Bulk density 1250 kg/m3
pH value 7 – 9 (50 g/l, H2O, 20 °C)
Flash point >100 °C DIN 51758


Safety information according to GHS
Hazard Statement(s) H251: Self-heating; may catch fire.
H302: Harmful if swallowed.
EUH031: Contact with acids liberates toxic gas.
Signal Word Danger
Hazard Pictogram(s)
Storage class Spontaneously Combustible Solids
WGK WGK 1 slightly water endangering
Disposal 6
Sulfides and sulfites as well as other reducing substances, inorganic cyanides and isonitriles: Stir into sodium hypochlorite solution (Cat. No. 105614) and, if necessary, leave to react for several days. Caution: some substances may show a violent reaction! Draw off any toxic or flammable gases that may be formed. Excess oxidant should be neutralized with sodium thiosulfate (Cat. No. 106513). Container D or E.


Safety information
R Phrase R 7-22-31
May cause fire.Harmful if swallowed.Contact with acids liberates toxic gas.
S Phrase S 7/8-26-28-43
Keep container tightly closed and dry.In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.After contact with skin, wash immediately with plenty of water.In case of fire, use sand. Never use water.
Categories of danger oxidizing, harmful
Hazard Symbol Harmful


Transport information
Declaration (transport by sea) IMDG-Code UN 1384 SODIUM DITHIONITE, 4.2, II
Declaration (transport by air) IATA-DGR UN 1384 SODIUM DITHIONITE, 4.2, II


Toxicological data
LD 50 oral LD50 rat 2500 mg/kg