Name:
Selenium(IV) oxide
Synonym:
Selenious acid anhydride; Selenium oxide; Selenium(IV) oxide; Selenium dioxide
CAS:
7446-08-4
Section 1 - Chemical Product
MSDS Name:Selenium(IV) oxide
Synonym:Selenious acid anhydride; Selenium oxide; Selenium(IV) oxide; Selenium dioxide
Synonym:Selenious acid anhydride; Selenium oxide; Selenium(IV) oxide; Selenium dioxide
Section 2 - COMPOSITION, INFORMATION ON INGREDIENTS
| CAS# | Chemical Name | emsds | EINECS# |
| 7446-08-4 | Selenium dioxide | 99 | 231-194-7 |
| Hazard Symbols: T N Risk Phrases: 23/25 33 50/53 |
Section 3 - HAZARDS IDENTIFICATION
EMERGENCY OVERVIEW
Toxic by inhalation and if swallowed. Danger of cumulative effects.
Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.Hygroscopic (absorbs moisture from the air).
Potential Health Effects
Eye:
May result in corneal injury. May cause pink, puffy eyelids due to an allergic reaction. Vapors may cause eye injury.
Skin:
Causes skin burns. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material.
Causes redness and pain. May be harmful if absorbed through the skin.
Ingestion:
Harmful if swallowed.
Inhalation:
Harmful if inhaled. Causes respiratory tract irritation. Irritation may lead to chemical pneumonitis and pulmonary edema.
Chronic:
Adverse reproductive effects have been reported in animals. Symptoms demonstrated by humans suffering from chronic selenium intoxication, selenosis, include depression, languor, nervousness, dermatitis, gastrointestinal disturbances, giddiness, garlic odor of the breath and sweat, moderate emotional instability, excess dental caries, and in extreme cases, loss of fingernails and partial alopecia (hair loss).
Toxic by inhalation and if swallowed. Danger of cumulative effects.
Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.Hygroscopic (absorbs moisture from the air).
Potential Health Effects
Eye:
May result in corneal injury. May cause pink, puffy eyelids due to an allergic reaction. Vapors may cause eye injury.
Skin:
Causes skin burns. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material.
Causes redness and pain. May be harmful if absorbed through the skin.
Ingestion:
Harmful if swallowed.
Inhalation:
Harmful if inhaled. Causes respiratory tract irritation. Irritation may lead to chemical pneumonitis and pulmonary edema.
Chronic:
Adverse reproductive effects have been reported in animals. Symptoms demonstrated by humans suffering from chronic selenium intoxication, selenosis, include depression, languor, nervousness, dermatitis, gastrointestinal disturbances, giddiness, garlic odor of the breath and sweat, moderate emotional instability, excess dental caries, and in extreme cases, loss of fingernails and partial alopecia (hair loss).
Section 4 - FIRST AID MEASURES
Eyes: In case of contact, immediately flush eyes with plenty of water for at least 15 minutes. Get medical aid immediately.
Skin:
Get medical aid immediately. In case of contact, immediately wipe away excess material with a dry cloth while removing contaminated clothing and shoes. Under safety shower, wash affected areas thoroughly with large amounts of water, and soap if available, for at least 15 minutes. Discard or decontaminate clothing and shoes.
Ingestion:
If swallowed, do not induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an unconscious person. Get medical aid.
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:
Skin:
Get medical aid immediately. In case of contact, immediately wipe away excess material with a dry cloth while removing contaminated clothing and shoes. Under safety shower, wash affected areas thoroughly with large amounts of water, and soap if available, for at least 15 minutes. Discard or decontaminate clothing and shoes.
Ingestion:
If swallowed, do not induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an unconscious person. Get medical aid.
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:
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. Reacts with water to form corrosive acids. Approach fire from upwind to avoid hazardous vapors and toxic decomposition products.
Extinguishing Media:
Substance is noncombustible; use agent most appropriate to extinguish surrounding fire.
As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Reacts with water to form corrosive acids. Approach fire from upwind to avoid hazardous vapors and toxic decomposition products.
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.
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.
Inform laundry personnel of contaminants hazards.
Storage:
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed. Store protected from moisture.
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.
Inform laundry personnel of contaminants hazards.
Storage:
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed. Store protected from moisture.
Section 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION
Engineering Controls:
Use process enclosure, local exhaust ventilation, or other engineering controls to control airborne levels below recommended exposure limits. Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower.
Exposure Limits CAS# 7446-08-4: United Kingdom, WEL - TWA: (listed as selenium compounds): 0.1 mg TWA (except hydrogen selenide, as Se) United Kingdom, WEL - STEL: (listed as selenium compounds): 0.3 m STEL (except hydrogen selenide, as Se) United States OSHA: 0.2 mg/m3 TWA (as Se) (listed under Selenium compounds).
Belgium - TWA: (listed as selenium compounds): 0.2 mg/m3 VLE (as Japan: (listed as selenium compounds): 0.1 mg/m3 OEL (except SeH2 SeF6, as Se) Malaysia: (listed as selenium compounds): 0.2 mg/m3 TWA (as Se) Netherlands: (listed as selenium compounds): 0.1 mg/m3 MAC (as Se Russia: 0.1 mg/m3 TWA Spain: (listed as selenium compounds): 0.1 mg/m3 VLA-ED (except hydrogen selenide, as Se) 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 protective 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.
Use process enclosure, local exhaust ventilation, or other engineering controls to control airborne levels below recommended exposure limits. Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower.
Exposure Limits CAS# 7446-08-4: United Kingdom, WEL - TWA: (listed as selenium compounds): 0.1 mg TWA (except hydrogen selenide, as Se) United Kingdom, WEL - STEL: (listed as selenium compounds): 0.3 m STEL (except hydrogen selenide, as Se) United States OSHA: 0.2 mg/m3 TWA (as Se) (listed under Selenium compounds).
Belgium - TWA: (listed as selenium compounds): 0.2 mg/m3 VLE (as Japan: (listed as selenium compounds): 0.1 mg/m3 OEL (except SeH2 SeF6, as Se) Malaysia: (listed as selenium compounds): 0.2 mg/m3 TWA (as Se) Netherlands: (listed as selenium compounds): 0.1 mg/m3 MAC (as Se Russia: 0.1 mg/m3 TWA Spain: (listed as selenium compounds): 0.1 mg/m3 VLA-ED (except hydrogen selenide, as Se) 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 protective 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.
Section 9 - PHYSICAL AND CHEMICAL PROPERTIES
Physical State: Crystalline powder
Color: white to off-white to pink
Odor: pungent sour
pH: acidic in aq soln
Vapor Pressure: 12.5 mm Hg @ 70 deg C
Viscosity: Not available.
Boiling Point: 315 deg C (sublimes)
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.
Specific Gravity/Density: 3.954
Molecular Formula: SeO2
Molecular Weight: 110.96
Section 10 - STABILITY AND REACTIVITY
Chemical Stability:
Stable under normal temperatures and pressures.
Conditions to Avoid:
Dust generation, confined spaces, moisture, high humidity.
Incompatibilities with Other Materials:
Strong reducing agents, attacks metals in the presence of moisture.
Hazardous Decomposition Products:
Selenium/selenium oxides, selenious acid.
Hazardous Polymerization: Will not occur.
Stable under normal temperatures and pressures.
Conditions to Avoid:
Dust generation, confined spaces, moisture, high humidity.
Incompatibilities with Other Materials:
Strong reducing agents, attacks metals in the presence of moisture.
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.
Not available.
Carcinogenicity:
Selenium dioxide - Not listed by ACGIH, IARC, or NTP.
Other:
See actual entry in RTECS for complete information.
CAS# 7446-08-4: VS8575000 LD50/LC50:
CAS# 7446-08-4: Oral, mouse: LD50 = 23300 ug/kg; Oral, rat: LD50 = 68100 ug/kg.
Not available.
Carcinogenicity:
Selenium dioxide - Not listed by ACGIH, IARC, or NTP.
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.
Hazard Class: 6.1
UN Number: 3283
Packing group: III
USA RQ: CAS# 7446-08-4: 10 lb final RQ; 4.54 kg final RQ
Section 15 - REGULATORY INFORMATION
European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: T N
Risk Phrases:
R 23/25 Toxic by inhalation and if swallowed.
R 33 Danger of cumulative effects.
R 50/53 Very toxic to aquatic organisms, may cause
long-term adverse effects in the aquatic environment.
Safety Phrases:
S 20/21 When using do not eat, drink or smoke.
S 28A After contact with skin, wash immediately with
plenty of water.
S 45 In case of accident or if you feel unwell, seek
medical advice immediately (show the label where
possible).
S 60 This material and its container must be
disposed of as hazardous waste.
S 61 Avoid release to the environment. Refer to
special instructions/safety data sheets.
WGK (Water Danger/Protection)
CAS# 7446-08-4: 2
Canada
CAS# 7446-08-4 is listed on Canadas DSL List.
CAS# 7446-08-4 is listed on Canadas Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 7446-08-4 is listed on the TSCA inventory.
