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MSDS 
:
 Selenium(iv) oxide, 99.999%
CAS 
:
 7446-08-4
SYNONYMS 
:
 Selenious Anhydride, Selenium Oxide, Selenium (IV) Dioxide
**** SECTION 2 - COMPOSITION, INFORMATION ON INGREDIENTS ****

+----------------+--------------------------------------+----------+-----------+
| CAS# | Chemical Name | % | EINECS# |
|----------------|--------------------------------------|----------|-----------|
| 7446-08-4 |SELENIUM(IV) OXIDE | 99.999 | 231-194-7 |
+----------------+--------------------------------------+----------+-----------+
Hazard Symbols: T
Risk Phrases: 23/25 33

**** SECTION 3 - HAZARDS IDENTIFICATION ****

EMERGENCY OVERVIEW
Toxic by inhalation and if swallowed. Danger of cumulative
effects.Corrosive.Toxic.

Potential Health Effects
Eye:
Causes severe eye burns. May result in corneal injury. May cause
pink, puffy eyelids due to an allergic reaction.
Skin:
Causes skin burns. May cause skin sensitization, an allergic
reaction, which becomes evident upon re-exposure to this material.
Causes redness and pain.
Ingestion:
Harmful if swallowed. May cause severe gastrointestinal tract
irritation with nausea, vomiting and possible burns. May cause liver
and kidney damage. May cause effects similar to those of acute
inhalation.
Inhalation:
Inhalation of high concentrations may cause central nervous system
effects characterized by nausea, headache, dizziness, unconsciousness
and coma. Causes respiratory tract irritation. Inhalation of fumes
may cause metal fume fever, which is characterized by flu-like
symptoms with metallic taste, fever, chills, cough, weakness, chest
pain, muscle pain and increased white blood cell count. May cause
spleen and liver damage.
Chronic:
May cause liver and kidney damage. May cause anemia and other blood
cell abnormalities. Repeated exposure may cause damage to the
spleen. Chronic exposure to selenium may cause central nervous
system effects, digestive tract disturbances, pallor, garlic breath,
Chronic exposure to selenium may cause pallor, garlic breath,
metallic taste, anemia, liver and spleen damage.

**** SECTION 4 - FIRST AID MEASURES ****

Eyes:
Flush eyes with plenty of water for at least 15 minutes,
occasionally lifting the upper and lower eyelids. Get medical aid
immediately. Do NOT allow victim to rub or keep eyes closed.
Skin:
Get medical aid immediately. Flush skin with plenty of soap and
water for at least 15 minutes while removing contaminated clothing
and shoes. Wash clothing before reuse. Discard contaminated clothing
in a manner which limits further exposure.
Ingestion:
If victim is conscious and alert, give 2-4 cupfuls of milk or water.
Never give anything by mouth to an unconscious person. Get medical
aid immediately.
Inhalation:
Get medical aid immediately. Remove from exposure to fresh air
immediately. If not breathing, give artificial respiration. If
breathing is difficult, give oxygen.
Notes to Physician:

**** SECTION 5 - FIRE FIGHTING MEASURES ****

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. Reacts with water to
form corrosive acids.
Extinguishing Media:
Substance is noncombustible; use agent most appropriate to
extinguish surrounding fire.

**** SECTION 6 - ACCIDENTAL RELEASE MEASURES ****

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. Clean up spills immediately, observing precautions in the
Protective Equipment section. Avoid generating dusty conditions.
Provide ventilation.

**** SECTION 7 - HANDLING and STORAGE ****

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. Keep container tightly closed. Do not ingest or inhale.
Storage:
Store in a tightly closed container. Store in a cool, dry,
well-ventilated area away from incompatible substances. Keep
containers tightly closed. Do not get water inside containers.

**** SECTION 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION ****

Engineering Controls:
Use adequate ventilation to keep airborne concentrations low.
Personal Protective Equipment

Eyes:
Wear appropriate protective eyeglasses or chemical
safety goggles as described by OSHA's eye and face
protection regulations in 29 CFR 1910.133 or European
Standard EN166.
Skin:
Wear appropriate protective gloves to prevent skin
exposure.
Clothing:
Wear appropriate protective clothing to prevent skin
exposure.
Respirators:
Follow the OSHA respirator regulations found in 29CFR
1910.134 or European Standard EN 149. Always use a
NIOSH or European Standard EN 149 approved respirator
when necessary.

**** SECTION 9 - PHYSICAL AND CHEMICAL PROPERTIES ****

Physical State: Solid
Appearance: off-white
Odor: pungent sour
pH: Not available.
Vapor Pressure: 12.5 mm Hg @70c
Viscosity: Not available.
Boiling Point: Not available.
Freezing/Melting Point: 340 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: Soluble in water.
Specific Gravity/Density: 3.954
Molecular Formula: SeO2
Molecular Weight: 110.9588

**** SECTION 10 - STABILITY AND REACTIVITY ****

Chemical Stability:
Stable under normal temperatures and pressures.
Conditions to Avoid:
Incompatible materials, contact with water.
Incompatibilities with Other Materials:
Strong oxidizing agents.
Hazardous Decomposition Products:
Selenium/selenium oxides, selenious acid.
Hazardous Polymerization: Will not occur.

**** SECTION 11 - TOXICOLOGICAL INFORMATION ****

RTECS#:
CAS# 7446-08-4: VS8575000
LD50/LC50:
CAS# 7446-08-4: Oral, mouse: LD50 = 23300 ug/kg; Oral, rat: LD50 =
68100 ug/kg.
Carcinogenicity:
SELENIUM(IV) OXIDE -
IARC: Group 3 carcinogen (listed as ** undefined **).
Other:
See actual entry in RTECS for complete information.

**** SECTION 12 - ECOLOGICAL INFORMATION ****



**** SECTION 13 - DISPOSAL CONSIDERATIONS ****

Dispose of in a manner consistent with federal, state, and local regulations.

**** SECTION 14 - TRANSPORT INFORMATION ****

IATA
Shipping Name: SELENIUM COMPOUND, N.O.S.
Hazard Class: 6.1
UN Number: 3283
Packing Group: III
IMO
Shipping Name: SELENIUM COMPOUND, N.O.S.
Hazard Class: 6.1
UN Number: 3283
Packing Group: III
RID/ADR
Shipping Name: SELENIUM COMPOUND, N.O.S.
Dangerous Goods Code: 6.1(55C)
UN Number: 3283

**** SECTION 15 - REGULATORY INFORMATION ****

European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: T
Risk Phrases:
R 23/25 Toxic by inhalation and if swallowed.
R 33 Danger of cumulative effects.
Safety Phrases:
S 7/8 Keep container tightly closed and dry.
S 20/21 When using do not eat, drink or smoke.
S 24/25 Avoid contact with skin and eyes.
S 28 After contact with skin, wash immediately
with...
S 28A After contact with skin, wash immediately with
plenty of water.
S 43 In case of fire, use ... (indicate in the space
the precise type of fire-fighting equipment. If water
increases the risk, add - never use water).
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# 7446-08-4: 2
United Kingdom Occupational Exposure Limits
CAS# 7446-08-4: OES-United Kingdom, TWA (listed as ** undefined
**): as Se: 0.1 mg/m3 TWA; (does not include hydrogen selenide)

Canada
CAS# 7446-08-4 is listed on Canada's DSL List.
CAS# 7446-08-4 is listed on Canada's Ingredient Disclosure List.
Exposure Limits
CAS# 7446-08-4: OEL-ARAB Republic of Egypt:TWA 0.2 mg(Se)/m3
OEL-AUSTRALIA:TWA 0.2 mg(Se)/m3
OEL-BELGIUM:TWA 0.2 mg(Se)/m3
OEL-DENMARK:TWA 0.1 mg(Se)/m3
OEL-FINLAND:TWA 0.1 mg(Se)/m3;STEL 0.3 mg(Se)/m3
OEL-GERMANY:TWA 0.1 mg(Se)/m3
OEL-HUNGARY:STEL 0.1 mg(Se)/m3
OEL-THE NETHERLANDS:TWA 0.2 mg(Se)/m3
OEL-THE PHILIPPINES:TWA 0.2 mg(Se)/m3
OEL-POLAND:TWA 0.1 mg(Se)/m3
OEL-SWEDEN:TWA 0.1 mg(Se)/m3
OEL-SWITZERLAND:TWA 0.1 mg(Se)/m3
OEL-TURKEY:TWA 0.2 mg(Se)/m3
OEL-UNITED KINGDOM:TWA 0.1 mg(Se)/m3
OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA check ACGIH TLV
OEL IN NEW ZEALAND, SINGAPORE, VIETNAM check ACGI TLV
US FEDERAL
TSCA
CAS# 7446-08-4 is listed on the TSCA inventory.

**** SECTION 16 - ADDITIONAL INFORMATION ****

MSDS Creation Date: 9/30/1998 Revision #1 Date: 8/02/2000

The information above is believed to be accurate and represents the best
information currently available to us. However, we make no warranty of
merchantability or any other warranty, express or implied, with respect to
such information, and we assume no liability resulting from its use. Users
should make their own investigations to determine the suitability of the
information for their particular purposes. In no way shall the company be
liable for any claims, losses, or damages of any third party or for lost
profits or any special, indirect, incidental, consequential or exemplary
damages, howsoever arising, even if the company has been advised of
the possibility of such damages.
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Selenium(iv) oxide, 99.999% 7446-08-4

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