Molekula
Selenium, powder
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Selenium powder is a crystalline elemental selenium used in electronics, glass manufacturing, and as a nutritional supplement. It is a yellow to red or gray solid with a molecular weight of 78.96 g/mol and a CAS number of 7782-49-2. Store at ambient temperatures. Hazardous: signal word Danger. Molekula supplies Selenium powder from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 g — £45.00 per pack ex VAT · £54.00 inc. VAT
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25 g — £551.00 per pack ex VAT · £661.20 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Black powder |
| Iron (Fe) | ≤ 0.01% |
| Lead (Pb) | ≤ 0.001% |
| Copper (Cu) | ≤ 0.001% |
| Sodium (Na) | ≤ 0.001% |
| Selenium (Se) | ≥ 99.0% |
| Sulphur (S) | ≤ 0.001% |
| Tellurium (Te) | ≤ 0.01% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 220.8 °C (gray selenium); vitreous selenium is transformed to gray selenium at 180 °C; alpha-form transforms to gray at temperatures above 120 °C |
| Boiling Point | 685 °C |
| Density | 4.8 (relative, water = 1) |
| Solubility (other solvents) | Soluble in aq potassium cyanide soln, potassium sulfite soln, dilute aqueous caustic alkali soln |
| Vapour Pressure | 0.1 Pa at 20 °C |
Source: PubChem CID 6326970 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 55557186 |
| CAS Number | 7782-49-2 |
| IUPAC Name | selenium |
| EC Number | 231-957-4 |
| Molecular Formula | Se |
| Molecular Weight | 78.96 |
| Exact Mass | 79.9165 |
| SMILES | [Se] |
| InChIKey | BUGBHKTXTAQXES-UHFFFAOYSA-N |
| InChI | InChI=1S/Se |
| PubChem CID | 6326970 |
| UN Number | UN3288 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28049000 |
| Tariff Code | 2804900000 |
Safety & GHS
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Toxic
GHS06
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Serious Health Hazard
GHS08
Hazard statements
- H301 Toxic if swallowed
- H331 Toxic if inhaled
- H373 May cause damage to organs through prolonged or repeated exposure
- H413 May cause long lasting harmful effects to aquatic life
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Colloidal selenium
- Elemental selenium
- Gray selenium
- Selen
- SELENIUM
- Selenium base
- Selenium dust
- Selenium elemental
- Selenium metallicum
- Vandex
Frequently asked questions
What is selenium powder used for?
Selenium powder is used in the production of semiconductors, glass coloring, and as a nutritional supplement in trace amounts.
What is the chemical formula and molecular weight of selenium powder?
The chemical formula is Se and the molecular weight is 78.96 g/mol.
How should selenium powder be stored?
Selenium powder should be stored at ambient temperature, away from moisture and incompatible materials.
What grade of selenium powder is available?
Molekula supplies selenium powder in high purity grade, suitable for laboratory and industrial applications.
Can Molekula supply selenium powder in bulk?
Yes, Molekula can supply selenium powder in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with a selenium powder order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.