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Sodium dithionite

1 - Product and Company Information

Product Name SODIUM HYDROSULFITE, TECH., CA. 85%
Product Number 157953
2 - Composition/Information on Ingredients

Product Name CAS # EC no Annex I
Index Number
SODIUM HYDROSULFITE 7775-14-6 231-890-0 016-028-00-1

Formula Na2O4S2
Molecular Weight 174.11 AMU
Synonyms SODIUM DITHIONITE

3 - Hazards Identification

SPECIAL INDICATION OF HAZARDS TO HUMANS AND THE ENVIRONMENT
May cause fire. Harmful if swallowed. Contact with acids liberates
toxic gas.

4 - First Aid Measures

AFTER INHALATION
If inhaled, remove to fresh air. If not breathing give
artificial respiration. If breathing is difficult, give oxygen.

AFTER SKIN CONTACT
In case of skin contact, flush with copious amounts of water for
at least 15 minutes. Remove contaminated clothing and shoes.
Call a physician.

AFTER EYE CONTACT
In case of contact with eyes, flush with copious amounts of
water for at least 15 minutes. Assure adequate flushing by
separating the eyelids with fingers. Call a physician.

AFTER INGESTION
If swallowed, wash out mouth with water provided person is
conscious. Call a physician.
5 - Fire Fighting Measures

EXPLOSION DATA
Dust Potential: This material, like most materials in powder
form, is capable of creating a dust explosion.

CONDITIONS OF FLAMMABILITY
Addition of small amounts of water or temperature's above 100??C
may cause self ignition.

EXTINGUISHING MEDIA
Suitable: Dry chemical powder.
Unsuitable: Do not use water.

SPECIAL RISKS
Specific Hazard(s): Flammable solid. Emits toxic fumes under
fire conditions.

SPECIAL PROTECTIVE EQUIPMENT FOR FIREFIGHTERS
Wear self-contained breathing apparatus and protective clothing
to prevent contact with skin and eyes.

6 - Accidental Release Measures

PERSONAL PRECAUTION PROCEDURES TO BE FOLLOWED IN CASE OF LEAK OR SPILL
Evacuate area. Shut off all sources of ignition. Use nonsparking
tools.

PROCEDURE(S) OF PERSONAL PRECAUTION(S)
Wear self-contained breathing apparatus, rubber boots, and heavy
rubber gloves.

METHODS FOR CLEANING UP
Cover with dry-lime, sand, or soda ash. Place in covered
containers using non-sparking tools and transport outdoors.
Ventilate area and wash spill site after material pickup is
complete.

7 - Handling and Storage

HANDLING
Directions for Safe Handling: Avoid contact with eyes, skin, and
clothing. Avoid breathing dust. Avoid prolonged or repeated
exposure.

STORAGE
Conditions of Storage: Keep container closed. Keep away from
heat, sparks, and open flame. Store in a cool dry place.
Incompatible Materials: Do not allow contact with water Avoid
contact with acid.

SPECIAL REQUIREMENTS: Air sensitive.

8 - Exposure Controls / Personal Protection

ENGINEERING CONTROLS
Safety shower and eye bath. Use nonsparking tools. Mechanical
exhaust required.

GENERAL HYGIENE MEASURES
Wash thoroughly after handling.

PERSONAL PROTECTIVE EQUIPMENT
Respiratory Protection: Government approved respirator.
Hand Protection: Compatible chemical-resistant gloves.
Eye Protection: Chemical safety goggles.

9 - Physical and Chemical Properties

Appearance Physical State: Solid

Property Value At Temperature or Pressure

pH N/A
BP/BP Range N/A
MP/MP Range 300 ??C
Flash Point N/A
Flammability N/A
Autoignition Temp N/A
Oxidizing Properties N/A
Explosive Properties N/A
Explosion Limits N/A
Vapor Pressure N/A
SG/Density N/A
Partition Coefficient N/A
Viscosity N/A
Vapor Density N/A
Saturated Vapor Conc. N/A
Evaporation Rate N/A
Bulk Density N/A
Decomposition Temp. N/A
Solvent Content N/A
Water Content N/A
Surface Tension N/A
Conductivity N/A
Miscellaneous Data N/A
Solubility N/A

10 - Stability and Reactivity

STABILITY
Stable: Stable.
Conditions to Avoid: Do not allow water to enter container because
of violent reaction. Air.
Materials to Avoid: Strong oxidizing agents, Acids.

HAZARDOUS DECOMPOSITION PRODUCTS
Hazardous Decomposition Products: Sulfur oxides, Sodium/sodium
oxides.

HAZARDOUS POLYMERIZATION
Hazardous Polymerization: Will not occur

11 - Toxicological Information

SIGNS AND SYMPTOMS OF EXPOSURE
To the best of our knowledge, the chemical, physical, and
toxicological properties have not been thoroughly investigated.

ROUTE OF EXPOSURE
Skin Contact: May cause skin irritation.
Skin Absorption: May be harmful if absorbed through the skin.
Eye Contact: May cause eye irritation.
Inhalation: May be harmful if inhaled. Material may be

irritating to mucous membranes and upper respiratory tract.
Ingestion: Harmful if swallowed.

12 - Ecological Information

ECOTOXICOLOGICAL EFFECTS

Test Type: LC50 Fish
Species: Leuciscus idus
Time: 96 h
Value: 10 - 100 mg/l

Test Type: EC50 Daphnia
Species: Daphnia magna
Time: 48 h
Value: 10 - 100 mg/l

Test Type: IC50 Algae
Time: 72 h
Value: > 100 mg/l

13 - Disposal Considerations

SUBSTANCE DISPOSAL
Contact a licensed professional waste disposal service to dispose
of this material. Burn in a chemical incinerator equipped with an
afterburner and scrubber but exert extra care in igniting as this
material is highly flammable. Observe all federal, state, and
local environmental regulations.

14 - Transport Information

RID/AD UN#: 1384
Class: 4.2
PG: II
Proper Shipping Name: Sodium dithionite (Sodium
hydrosulphite)

IMDG
UN#: 1384
Class: 4.2
PG: II
Proper Shipping Name: SODIUM DITHIONITE
Marine Pollutant: No
Severe Marine Pollutant: No

IATA
UN#: 1384
Class: 4.2
PG: II
Proper Shipping Name: SODIUM DITHIONITE
Inhalation Packing Group I: No

15 - Regulatory Information

CLASSIFICATION AND LABELING ACCORDING TO EU DIRECTIVES
ANNEX I INDEX NUMBER: 016-028-00-1
INDICATION OF DANGER: Xn
Harmful.
R-PHRASES: 7 22 31
May cause fire. Harmful if swallowed. Contact with acids

liberates toxic gas.
S-PHRASES: 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 soap-suds. In case of fire, use dry powder. Never use water.

COUNTRY SPECIFIC INFORMATION

Germany
WGK: 1

SWITZERLAN SWISS POISON CLASS: 3

16 - Other Information

WARRANTY
The above information is believed to be correct but does not
purport to be all inclusive and shall be used only as a guide. The
information in this document is based on the present state of our
knowledge and is applicable to the product with regard to
appropriate safety precautions. It does not represent any
guarantee of the properties of the product. Sigma-Aldrich Inc.,
shall not be held liable for any damage resulting from handling or
from contact with the above product. See reverse side of invoice
or packing slip for additional terms and conditions of sale.
Copyright 2005 Sigma-Aldrich Co. License granted to make unlimited
paper copies for internal use only.

DISCLAIME For R&D use only. Not for drug, household or other uses.

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