SE2821 Selenium Powder (Se Powder) (CAS 7782-49-2)

Catalog No. SE2821
Molecular Formula Se
CAS Number 7782-49-2
Appearance Gray to black powder
Purity 99.99%

Selenium Powder (CAS 7782-49-2) is gray to black powder, soluble in concentrated sulfuric acid and chloroform, slightly soluble in carbon disulfide, insoluble in water and ethanol. Stanford Advanced Materials (SAM) offers high-quality Selenium Powder.

Related products: Copper (I) Selenide Powder, Cadmium Selenide Powder, Bismuth (III) Selenide Powder, Sodium Selenite Powder.


Selenium Powder Description

Selenium Powder (CAS 7782-49-2) is nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur, and tellurium, and also has similarities to arsenic. Selenium is found in metal sulfide ores, where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production.


Selenium Powder Specifications

Product Name

Selenium Powder (Se Powder)

CAS Number


Molecular formula


Molecular weight



4.79 g/cm3

Melting point

221 °C, 430 °F

Boiling point

685 °C, 1265 °F


Safety Information

Signal word


Hazard statements

H301 + H331 - H373 - H413

Precautionary statements

P260 - P264 - P273 - P301 + P310 + P330 - P304 + P340 + P311 - P403 + P233

Personal protective equipment

Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges


UN3288 - class 6.1 - PG 3 - EHS - RQ - Toxic solid, inorganic, n.o.s., HI: all

WGK Germany



Selenium Powder Application


Researchers found that the application of selenium fertilizer to lettuce crops decreased the accumulation of lead and cadmium. Peaches and pears given a foliar selenium spray contained higher levels selenium and also stayed firm and ripe longer when in storage.

Manganese electrolysis

During the electrowinning of manganese, the addition of selenium dioxide decreases the power necessary to operate the electrolysis cells. China is the largest consumer of selenium dioxide for this purpose. For every tonne of manganese, an average of 2 kg selenium oxide is used.

Glass production

The largest commercial use of Se, accounting for about 50% of consumption, is for the production of glass. Se compounds confer a red color to the glass. This color cancels out the green or yellow tints that arise from iron impurities typical for most glass. For this purpose, various selenite and selenate salts are added. For other applications, a red color may be desired, produced by mixtures of CdSe and CdS.


Selenium is used with bismuth in brasses to replace more toxic lead. The regulation of lead in drinking water applications such as in the US with the Safe Drinking Water Act of 1974, made a reduction of lead in brass necessary. The new brass is marketed under the name EnviroBrass. Like lead and sulfur, selenium improves the machinability of steel at concentrations around 0.15%. Selenium produces the same machinability improvement in copper alloys.

Lithium–selenium batteries

The lithium–selenium (Li–Se) battery is one of the most promising systems for energy storage in the family of lithium batteries. The Li–Se battery is an alternative to the lithium–sulfur battery, with an advantage of high electrical conductivity.


Amorphous selenium (α-Se) thin films have found application as photoconductors in flat panel x-ray detectors. These detectors use amorphous selenium to capture and convert incident x-ray photons directly into electric charge.


SE2596 Nickel(II) Selenide Powder (CAS1314-05-2)

SE2596 Nickel(II) Selenide Powder (CAS1314-05-2)

SE2597 Tin(II) Selenide (SnSe) Powder (CAS 1315-06-6)

SE2597 Tin(II) Selenide (SnSe) Powder (CAS 1315-06-6)

SE2630 Manganese (II) Selenide Powder, MnSe Powder (CAS 1313-22-0)

SE2630 Manganese (II) Selenide Powder, MnSe Powder (CAS 1313-22-0)

SE2631 Tin Selenide Powder, SnSe Powder (CAS 1315-06-6)

SE2631 Tin Selenide Powder, SnSe Powder (CAS 1315-06-6)

SE2632 Tungsten (IV) Selenide Powder, WSe2 Powder (CAS 12067-46-8)

SE2632 Tungsten (IV) Selenide Powder, WSe2 Powder (CAS 12067-46-8)

AS2796 Arsenic Selenide (CAS 1303-36-2)

AS2796 Arsenic Selenide (CAS 1303-36-2)

SE2799 Gallium (II) Selenide (GaSe) (CAS 12024-11-2)

SE2799 Gallium (II) Selenide (GaSe) (CAS 12024-11-2)

AL2804 Aluminum Selenide (CAS 1302-82-5)

AL2804 Aluminum Selenide (CAS 1302-82-5)


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