MSDS Name:Sodium metasilicate pentahydrate
Synonym:Disodium metasilicate pentahydrate; Disodium trioxosilicate pentahydrate

EMERGENCY OVERVIEW
Harmful if swallowed. Causes burns. Irritating to respiratory system.
Potential Health Effects
Eye:
Contact with eyes may cause severe irritation, and possible eye burns.
Skin:
Contact with skin causes irritation and possible burns, especially if the skin is wet or moist.
Ingestion:
May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns. May be harmful if swallowed.
Inhalation:
May cause severe irritation of the upper respiratory tract with pain, burns, and inflammation.
Chronic:
Chronic inhalation may cause effects similar to those of acute inhalation.

Eyes: In case of contact, immediately flush eyes with plenty of water for at least 15 minutes. Get medical aid immediately.
Skin:
In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.
Get medical aid immediately. Wash clothing before reuse.
Ingestion:
If swallowed, do NOT induce vomiting. Get medical aid immediately.
If victim is fully conscious, give a cupful of water. Never give anything by mouth to an unconscious person.
Inhalation:
If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician:

General Information:
As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Substance is noncombustible.
Extinguishing Media:
Use extinguishing media most appropriate for the surrounding fire.

General Information: Use proper personal protective equipment as indicated in Section 8.
Spills/Leaks:
Vacuum or sweep up material and place into a suitable disposal container. Avoid generating dusty conditions. Provide ventilation.

Handling:
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Do not get in eyes, on skin, or on clothing. Avoid ingestion and inhalation.
Storage:
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Engineering Controls:
Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower. Use adequate ventilation to keep airborne concentrations low.
Exposure Limits CAS# 6834-92-0: CAS# 10213-79-3: Personal Protective Equipment Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHAs eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166.
Skin:
Wear appropriate gloves to prevent skin exposure.
Clothing:
Wear appropriate protective clothing to prevent skin exposure.
Respirators:
Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.

Physical State: Solid
Color: white
Odor: Not available.
pH: 12.6 (1% soln)
Vapor Pressure: Not available.
Viscosity: Not available.
Boiling Point: Not available.
Freezing/Melting Point: 72 deg C
Autoignition Temperature: Not applicable.
Flash Point: Not applicable.
Explosion Limits, lower: Not available.
Explosion Limits, upper: Not available.
Decomposition Temperature: Not available.
Solubility in water: Very soluble in water
Specific Gravity/Density: 1.75
Molecular Formula: Na2SiO3.5H2O
Molecular Weight: 212.74

Chemical Stability:
Stable.
Conditions to Avoid:
Dust generation.
Incompatibilities with Other Materials:
Acids, fluorine, Flammable hydrogen gas may be produced on prolonged contact with materials such as aluminum, tin, lead, and zinc..
Hazardous Decomposition Products:
Toxic fumes of sodium oxide.
Hazardous Polymerization: Has not been reported.

RTECS#:
CAS# 6834-92-0: VV9275000 CAS# 10213-79-3: VV9287500 LD50/LC50:
CAS# 6834-92-0: Draize test, rabbit, skin: 250 mg/24H Severe; Oral, mouse: LD50 = 770 mg/kg; Oral, rat: LD50 = 1153 mg/kg.
CAS# 10213-79-3: Oral, rat: LD50 = 847 mg/kg.
Carcinogenicity:
Sodium metasilicate anhydrous - Not listed by ACGIH, IARC, or NTP.
Sodium metasilicate pentahydrate - Not listed by ACGIH, IARC, or NTP.
Other:
See actual entry in RTECS for complete information.

Products which are considered hazardous for supply are classified as Special Waste and the disposal of such chemicals is covered by regulations which may vary according to location. Contact a specialist disposal company or the local waste regulator for advice. Empty containers must be decontaminated before returning for recycling.

IATA
Shipping Name: DISODIUM TRIOXOSILICATE
Hazard Class: 8
UN Number: 3253
Packing Group: III
IMO
Shipping Name: DISODIUM TRIOXOSILICATE
Hazard Class: 8
UN Number: 3253
Packing Group: III
RID/ADR
Shipping Name: DISODIUM TRIOXOSILICATE
Hazard Class: 8
UN Number: 3253
Packing group: III

European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: C
Risk Phrases:
R 22 Harmful if swallowed.
R 34 Causes burns.
R 37 Irritating to respiratory system.
Safety Phrases:
S 13 Keep away from food, drink and animal feeding
stuffs.
S 24/25 Avoid contact with skin and eyes.
S 36/37/39 Wear suitable protective clothing, gloves
and eye/face protection.
S 45 In case of accident or if you feel unwell, seek
medical advice immediately (show the label where
possible).
WGK (Water Danger/Protection)
CAS# 6834-92-0: 1
CAS# 10213-79-3: 1
Canada
CAS# 6834-92-0 is listed on Canadas DSL List.
CAS# 6834-92-0 is listed on Canadas Ingredient Disclosure List.
CAS# 10213-79-3 is not listed on Canadas Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 6834-92-0 is listed on the TSCA inventory.
CAS# 10213-79-3 is not on the TSCA Inventory because it is a hydrate.
It is considered to be listed if the CAS number for the anhydrous form
is on the inventory (40CFR720.3(u)(2)).