- C.I. 77805
Depending on allotropic form, the color can range from red to blue to greyto violet to black. Crystals
As ingredient of toning baths in photography, as pigment in manufacture ruby-, pink-, orange-, or red-colored glass, as metallic base in making electrodes for arc lights, electrical instruments & apparatus, as rectifier in radio & television sets, in selenium photocells, in semiconductor fusion mixtures, selenium cells.
Registry Numbers and Inventories.
EC Index Number
Toxic; Danger of cumulative effects; Dangerous for the Environment
R 23/25 33 53
S 20/21 28 45 61
Tumorigen; Reproductive Effector
Swiss Giftliste 1
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
0.0071 (25 C)
4.28 g/cm3 (20 C)
Solubility in water
221 cp at 220C
105.5 g/s2 (220 C)
6.6 (20 C)
0.000412/K (30 C)
Heat of fusion
Heat of vaporization
Heat of combustion
-2251 kJ/mol at 298 k
Hazards and Protection.
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Wash thoroughly after handling. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid contact with skin and eyes. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation.
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.
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.
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stable under normal temperatures and pressures.
Strong oxidizing agents, acids, metal oxides, carbides, fluorine, oxygen, potassium.
Irritating and toxic fumes and gases, selenium/selenium oxides.
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use extinguishing media appropriate to the surrounding fire. Substance is noncombustible. Extinguishing media: Substance is noncombustible; use agent most appropriate to extinguish surrounding fire. In case of fire use water spray, dry chemical, carbon dioxide, or chemical foam.
May burn but does not ignite readily.
Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.
Hazardous decomposition products: Toxic gases and vapors may be released in a fire involving selenium.
OSHA PEL: TWA 0.2 mg/m3 NIOSH REL: TWA 0.2 mg/m3 *Note: PEL and REL also apply to other selenium compounds (as Se) except Selenium hexafluoride. NIOSH IDLH: 1 mg/m3 (as Se)
Prolonged or repeated skin contact may cause dermatitis. May cause reproductive and fetal effects. 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. Chronic selenium poisoning is characterized by loss of hair and nails, skin lesions, and abnormalities of the nervous system.
May cause irritation of the digestive tract. May cause liver and kidney damage. May be harmful if swallowed. May cause alopecia (loss of hair). May cause spleen damage. May cause blood abnormalities. Effects may be delayed. May cause garlic smell on the breath and body.
Causes respiratory tract irritation. May cause effects similar to those described for ingestion. May produce anemia, leucocytosis (increase in the white blood cell count) , cloudy swelling and fatty degeneration of the viscera.
May cause skin irritation. Prolonged and/or repeated contact may cause irritation and/or dermatitis. May be absorbed through the skin. Contact with the skin may cause the skin to appear to be blue and the nails brittle and yellow.
Causes eye irritation. May result in corneal injury. May cause pink, puffy eyelids due to an allergic reaction.
Do NOT induce vomiting. 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.
Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
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.
Immediately 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.
USCG CHRIS Code
Std. Transport #