Sodium Silicate Powder Toxicology
By Edouard Bastarache
Identification
Cas Number : 1344-09-8
French Names :
Silicate de sodium
Silicate de sodium (ratio SiO2:Na2O
greater than 2,4:1)
English Names :
Sodium silicate
Silicic acid, sodium salt
Sodium sesquisilicate
Uses and Sources of
Emission :
Manufacture of soaps and detergents.
Fluxing of casting slips in
ceramics.
Physical and Chemical
Properties :
I-Appearance :
Powder.
II-Color :
White.
III-Odor :
Odorless or musty odor.
IV-pH :
Approximately 12.7
V-Bulk density :
Approximately 90 pounds/ft³
VI-Solubility in water :
Soluble in all proportions.
Stability and Reactivity
:
I-Stability :
This material is stable under all
conditions of use and storage.
II-Conditions to avoid :
None.
III-Materials to avoid :
Generates heat when mixed with acid. May
react with ammonium salt solutions resulting in evolution of
ammonia gas. Flammable hydrogen gas may be produced on contact
with aluminum, tin, lead, and zinc.
IV-Hazardous decomposition products
:
Sodium oxide.
Inflammability and
Explosiveness :
I-Inflammability :
This product is non flammable.
II- Fire-fighting equipment
:
The following protective equipment for
fire fighters is recommended when this material is present in the
area of a fire:
- chemical goggles,
- body-covering protective clothing,
- chemical resistant gloves,
- rubber boots.
III-Combustion Product :
Sodium Oxide.
IV-Materials to Avoid :
This product is incompatible with these
substances:
- acids,
- carbon dioxide.
When mixed with an acid it generates
heat. Can react with ammonium salt solutions and release gaseous
ammonia.
Flammable hydrogen gas can be produced
on contact with :
- aluminium,
- tin,
- lead,
- Zinc
Toxicology
I-Experimental Toxicology
:
DL50 :
Rat (Oral): 1 280 mg/kg.
Mouse (Oral): 2 400 mg/kg.
Rat (Oral): 1 600 mg/kg.
II-Absorption :
This product is absorbed by the
respiratory and the digestive tracts.
III-Acute Effects :
A-Ocular Contact :
Severe irritation or corrosion.
B-Skin Contact :
Severe irritation or corrosion.
C-Inhalation :
Severe irritation or corrosion.
D-Ingestion :
Severe irritation or corrosion.
Nausea, vomiting, diarrhoea, burns of
the mouth, oesophagus and stomach.
Death is possible.
Note : Sodium silicate is considered
corrosive when its ratio SiO2:Na2O is lower than
2.4 for the powdered product or lower
than 1.8 for solutions, otherwise it is considered
irritating.
IV-Chronic Effects :
Contact dermatitis.
Effects on Development
:
No data concerning an effect on
development was found in the consulted documentary sources.
Effects on Reproduction
:
No data concerning the effects on
reproduction was found in the consulted documentary
sources.
Data on Mother's milk
:
There is no data concerning its
excretion or detection in milk.
Cancerogenic Effects
:
No data concerning a cancerogenic effect
was found in the consulted documentary sources.
Mutagenic Effects :
No data concerning a mutagenic in vivo
or in vitro effect on cells of mammals was found in the consulted
documentary sources.
First Aid Measures
I-Eye :
In case of contact, immediately flush
eyes with plenty of water for at least 15 minutes. If easy to do,
remove contact lenses, if worn.
Get medical attention.
II-Skin :
In case of contact, immediately flush
skin with plenty of water. Remove contaminated clothing and shoes.
Get medical attention.
III-Inhalation :
Remove to fresh air. If not breathing,
give artificial respiration. If breathing is difficult, give
oxygen.
Get medical attention.
IV-Ingestion :
Do not induce vomiting. Seek medical
attention immediately. If the victim is conscious, give a cup of
water.
Never give anything by mouth to somebody
who is unconscious.
Accidental Release
Measures
I-Personal protection :
Wear chemical goggles, body-covering
protective clothing, chemical resistant gloves, and rubber boots,
an approved dust respirator where dust occurs.
II-Environmental Hazards
:
Sinks and mixes with water. High pH of
this material is harmful to aquatic life
III-Small spill cleanup :
Carefully shovel or sweep up spilled
material and place in suitable container. Avoid generating dust.
Use appropriate Personal Protective Equipment
IV-Large spill cleanup :
Keep unnecessary people away; isolate
hazard area and deny entry. Do not touch or walk through spilled
material. Carefully shovel or sweep up spilled material and place
in suitable container. Avoid generating dust.
Use appropriate Personal Protective
Equipment. In case of contact with water, prevent runoff from
entering into storm sewers and ditches which lead to natural
waterways. Neutralize contaminated area and flush with large
quantities of water.
Comply with applicable environmental
regulations.
Handling and
Storage
I-Handling :
Do not get in eyes. Avoid contact with
skin and clothing. Avoid breathing dust. Keep container closed.
Promptly clean up spills.
II-Storage :
Keep containers closed. Store in clean
steel or plastic containers. Separate from acids, reactive metals,
and ammonium salts. Do not store in aluminum, fiberglass, copper,
brass, zinc or galvanized containers. This product can absorb
water from the air. In case of high humidity or storage for
extended periods of time, use plastic bags to enclose product
containers to avoid caking.
Exposure
Controls/Personal Protection
I-Engineering controls :
Use only with adequate ventilation. Keep
containers closed. Safety shower and eyewash fountain should be
within direct access.
II-Respiratory protection
:
Use an approved dust respirator where
dust occurs.
III-Skin protection :
Wear body-covering protective clothing
and gloves.
IV-Eye protection :
Wear chemical goggles.
Environmental
Fate
This material is not persistent in
aquatic systems, but its high pH when undiluted or unneutralized
is acutely harmful to aquatic life. Diluted material rapidly
depolymerizes to yield dissolved silica in a form that is
indistinguishable from natural dissolved silica.
This material does not bioaccumulate
except in species that use silica as a structural material such as
diatoms and siliceous sponges.
Where abnormally low natural silica
concentrations exist (less than 0.1 ppm), dissolved silica may be
a limiting nutrient for diatoms and a few other aquatic algal
species.
However, the addition of excess
dissolved silica over the limiting concentration will not
stimulate the growth of diatom populations; their growth rate is
independent of silica concentration once the limiting
concentration is exceeded. Neither silica nor sodium will
appreciably bioconcentrate up the food chain.
Références :
1-Occupational Medicine,Carl Zenz,
dernière édition.
2-Clinical Environmental Health and
Toxic Exposures, Sullivan & Krieger; dernière
édition.
3-Sax's Dangerous Properties of
Industrial Materials, Lewis C., dernière
édition.
4-Toxicologie Industrielle et
Intoxications Professionnelles, Lauwerys R. dernière
édition.
5-Chemical Hazards of the Workplace,
Proctor & Hughes, 4e édition.
6-CSST-Québec, Service du
Répertoire Toxicologique, 2005
7- PQ Corporation, Sodium Silicate
Powder, MSDS, John G. Blumberg, 05/29/02
Edouard Bastarache M.D.
Occupational & Environmental Medicine
Author of "Substitutions for Raw Ceramic Materials"
Tracy, Québec, CANADA
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
Out Bound Links
In Bound Links
- (Materials - General)
Sodium Silicate - Na2SiO3 - Na2SiO3 Deflocculant, De-flocculant
Waterglass
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