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Description
Catalogue Number	106505
Synonyms	Sodium hydrosulfite, Sodium hypodisulfite

Physicochemical Information
Density	2.5 g/cm3 (20 °C)
Flash point	>100 °C
Ignition temperature	>200 °C
Melting Point	100 °C (decomposition)
pH value	5.5 – 8.5 (50 g/l, H₂O, 20 °C)
Bulk density	1250 kg/m3
Solubility	250 g/l (slow decomposition)

Toxicological Information
LD 50 oral	LD50 Rat 2500 mg/kg

Safety Information according to GHS
Hazard Pictogram(s)
Hazard Statement(s)	H251: Self-heating: may catch fire. H302: Harmful if swallowed. H319: Causes serious eye irritation. EUH031: Contact with acids liberates toxic gas.
Precautionary Statement(s)	P235: Keep cool. P264: Wash skin thoroughly after handling. P280: Wear protective gloves/ protective clothing/ eye protection/ face protection/ hearing protection. P301 + P312: IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P337 + P313: If eye irritation persists: Get medical advice/ attention. P403 + P235: Store in a well-ventilated place. Keep cool.
Signal Word	Danger
Storage class	4.2 Pyrophoric and self-heating hazardous materials
WGK	WGK 1 slightly hazardous to water
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
Categories of danger	oxidizing, harmful

Storage and Shipping Information
Storage	Store at +2°C to +30°C.

Transport Information
Declaration (railroad and road) ADR, RID	UN 1384 , 4.2, II
Declaration (transport by air) IATA-DGR	UN 1384 , 4.2, II
Declaration (transport by sea) IMDG-Code	UN 1384 , 4.2, II

Merck 106505 1000 Sodium Dithionite Technical Grade1 KG.