Selenium Dioxide
- CAS Number
- 7446-08-4
- HSN Code
- 28112990
- Molecular Formula
- SeO2
- Catalogue Number
- AL3967
- Purity
- ≥ 98%
- Molecular Weight
- 110.96 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Selenium dioxide appears as a white or creamy-white volatile lustrous crystal or crystalline powder with a pungent sour smell. Melting point 340 deg C. Density 3.954 g / cm3.
Also known as Selenium(IV) oxide, Selenous anhydride.
- Catalogue No.
- AL3967
- CAS Number
- 7446-08-4
- Molecular Formula
- SeO2
- Molecular Weight
- 110.96 g/mol
- HSN Code
- 28112990
- Grade
- 98% (sublimed)
- Product Form
- Substance
Melting point: 340 °C under pressure; Boiling point: 315 °C at 760 mmHg (sublimes); Density: 3.954 at 15 °C/15 °C; Solubility: Soluble in concentrated sulfuric acid.
- Appearance
- Lustrous tetragonal needles; yellowish green vapor
- Shelf Life
- -
- Packaging
- Available in: 100 gm plastic bottle, 500 gm plastic bottle
- Storage
- Separated from food and feedstuffs. Dry.
1.1 — Product identifier
- Chemical Name
- Selenium Dioxide
- Catalogue No.
- AL3967
- Product form
- Substance
- CAS Number
- 7446-08-4
- EC Number
- 231-194-7
- Grade
- 98% (sublimed)
- EC Index Number
- SelO2
- Chemical Formula
- SeO2
- HSN Code
- 28112990
- Synonyms
- Selenium(IV) oxide, Selenous anhydride
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Oxidizing agent in organic synthesis
- Uses advised against
- Not specified
1.3 — Details of the supplier of the safety data sheet
- Company identification
- Address:- 102, B wing, Savgan Heights, RTO Lane,Andheri (W), Mumbai-400 053Maharashtra, India.
1.4 — Emergency Contact Details
- Phone / e-Mail
- Phone : +91 22 26317055 Mobile : +91 9820385757 e-mail : info@alphachemika.co.in
2.1 — Classification of the substance or mixture
- Classification according to Regulation (EC) No 1272/2008
- Acute Tox. 3; STOT RE 2; Aquatic Acute 1; Aquatic Chronic 1
- Classification source
- ECHA C&L Inventory via PubChem CID 24007 - hazard classes notified by at least 50% of companies; pictograms and signal word derived from those statements
2.2 — Label elements
- Hazard pictograms
- Acute Toxic, Health Hazard, Environmental Hazard
- Signal word
- Danger
- Hazard statements
- H301: Toxic if swallowed; H331: Toxic if inhaled; H373: May causes damage to organs through prolonged or repeated exposure; H400: Very toxic to aquatic life; H410: Very toxic to aquatic life with long lasting effects
2.3 — Other hazards
- Other hazards
- Highly toxic; may cause respiratory irritation and skin burns.
3.1 — Substance
- Name
- Selenium Dioxide
- CAS No.
- 7446-08-4
4.1 — Description of first aid measures
- First-aid measures after inhalation
- Remove victim to fresh air; give oxygen if needed.
- First-aid measures after skin contact
- Flush with water.
- First-aid measures after eye contact
- Flush immediately and thoroughly with water.
- First-aid measures after ingestion
- Induce vomiting; follow with gastric lavage and saline cathartics.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Symptoms of exposure may include coughing, shortness of breath, skin irritation, and eye damage.
4.3 — Indication of any immediate medical attention and special treatment needed
- General information
- Treat symptomatically. Show this safety data sheet to the treating physician.
5.1 — Extinguishing media
- Suitable extinguishing media
- Water spray, carbon dioxide, dry chemical powder, foam.
- Unsuitable extinguishing media
- Not specified
5.2 — Special hazards arising from the substance or mixture
- Special procedures
- Non-flammable, but may emit toxic fumes in a fire.
5.3 — Advice for firefighters
- Protection during firefighting
- Do not enter fire area without proper protective equipment, including respiratory protection.
6.1.1 — For non-emergency personnel
- Emergency procedures
- Evacuate area and ventilate. Wear appropriate protective equipment. Contain and collect spillage.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Evacuate danger area! Consult an expert! Sweep spilled substance into covered containers. Carefully collect remainder. Then store and dispose of according to local regulations. Personal protection: complete protective clothing including self-contained breathing apparatus.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Handle under a fume hood with appropriate PPE, including gloves and goggles. Avoid inhalation and skin contact.
- Hygiene measures
- Wash hands and other exposed areas with mild soap and water before eating, drinking or smoking and when leaving work.
7.2 — Conditions for safe storage, including any incompatibilities
- Storage conditions
- Separated from food and feedstuffs. Dry.
8.2 — Exposure controls
- Hand protection
- Protective gloves (e.g. nitrile rubber)
- Eye protection
- Chemical safety goggles or safety glasses
- Skin and body protection
- Wear suitable protective clothing
- Respiratory protection
- Use a NIOSH-approved respirator if exposure limits are exceeded.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White to pale gray
- Odour
- Vapor has a pungent sour smell
- Odour threshold
- Not specified
- pH value
- Not applicable
- Relative evaporation rate (butylacetate=1)
- Not applicable
- Melting point
- 340 °C under pressure
- Freezing point
- Not applicable
- Boiling point
- 315 °C at 760 mmHg (sublimes)
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- Not specified
- Flammability (solid, gas)
- Non-flammable
- Vapour pressure
- 12.5 mm Hg at 70 °C; 20.2 mm Hg at 94 °C; 39.0 mm Hg at 181 °C; 760 mm Hg at 315 °C; 848 mm Hg at 320 °C
- Relative vapour density at 20°C
- Not specified
- Density
- 3.954 at 15 °C/15 °C
- Solubility
- Soluble in concentrated sulfuric acid
- Log Pow
- Not specified
- Viscosity, kinematic
- Not applicable
- Viscosity, dynamic
- Not applicable
- Explosive properties
- Not explosive
- Oxidising properties
- Oxidizing agent
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Stable under normal conditions, but reacts with strong acids and bases.
10.2 — Chemical stability
- Chemical stability
- Stable to light and heat.
10.3 — Possibility of hazardous reactions
- Possibility of hazardous reactions
- Decomposes on heating. This produces toxic fumes. The solution in water is a medium strong acid (selenic acid).
10.4 — Conditions to avoid
- Conditions to avoid
- Avoid contact with incompatible materials and excessive heat.
10.5 — Incompatible materials
- Incompatible materials
- Strong acids, strong bases, and reducing agents.
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- When heated to decomposition emits toxic fumes of selenium.
11.1 — Information on toxicological effects
- Acute toxicity
- LD50 Rat oral 48 mgkgday; LD50 Mouse (male) oral 16 mgkgday; LD50 Rabbit subcutaneous 4 mg/kg
- Skin corrosion/irritation
- Not classified (based on available data)
- Serious eye damage/irritation
- Not classified (based on available data)
- Respiratory or skin sensitisation
- Not classified (based on available data)
- Germ cell mutagenicity
- Not classified (based on available data)
- Carcinogenicity
- Not classified (based on available data)
- Specific target organ toxicity (single exposure)
- Not classified (based on available data)
- Specific target organ toxicity (repeated exposure)
- H373: May causes damage to organs through prolonged or repeated exposure
12.1 — Toxicity
- Toxicity information
- Not specified
12.2 — Persistence - degradability
- Persistence - degradability
- Not specified
12.3 — Bioaccumulative potential
- Bioaccumulative potential
- Not specified
12.4 — Mobility in soil
- Mobility in soil
- Not specified
12.6 — Other adverse effects
- Environmental precautions
- Not specified
13.1 — Waste treatment methods
- Additional Info
- Dispose of contents/container in accordance with local, regional, national and international regulations.
14.1 — UN number
- UN-No. (ADR)
- UN 3283
- UN-No. (IMDG)
- UN 3283
- UN-No. (IATA)
- UN 3283
- UN-No. (ADN)
- UN 3283
- UN-No. (RID)
- UN 3283
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Selenium Dioxide
- Proper Shipping Name (IMDG)
- Selenium Dioxide
- Proper Shipping Name (IATA)
- Selenium Dioxide
- Proper Shipping Name (ADN)
- Selenium Dioxide
- Proper Shipping Name (RID)
- Selenium Dioxide
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- 6.1
14.4 — Packing group
- Packing group (ADR)
- III
- Packing group (IMDG)
- III
- Packing group (IATA)
- III
- Packing group (ADN)
- III
- Packing group (RID)
- III
14.5 — Environmental hazards
- Dangerous for the environment
- Not specified
- Marine pollutant
- Not specified
- Other information
- No supplementary information available
15.1 — Safety, health and environmental regulations/legislation specific for the substance or mixture
- 15.1.1 EU-Regulations
- Not specified
Selenium dioxide is widely used in organic chemistry as a selective oxidant, particularly in the Riley oxidation process, which converts active methyl and methylene groups into carbonyl compounds. This reaction is valuable in the synthesis of various pharmaceuticals, agrochemicals, and fine chemicals. Additionally, selenium dioxide is utilized in the preparation of selenium-containing compounds and as a reagent in analytical chemistry for the detection of certain organic compounds. Its role in the synthesis of organoselenium compounds also highlights its importance in materials science and biochemistry.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL01306
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 110.96 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay | ≥ 98% | 98.5% |
| Moisture Content | ≤ 0.5% | 0.3% |
| Residue on Ignition | ≤ 0.1% | 0.05% |
| Related Substances | None detected | None detected |
| Solubility | Soluble in water | Soluble |
The above product is expected to comply with 98% (sublimed) grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| 98% (sublimed) | ≥ 98% | m.p. 340 °C under pressure; b.p. 315 °C at 760 mmHg (sublimes) | ≤ 0.5% | ≤ 0.1% | None detected | Soluble in concentrated sulfuric acid |
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