Gray-brown powder. No odor.
In nuclear chemistry as neutron absorber, in ignitron rectifiers, in alloys, usually to harden other metals.
Registry Numbers and Inventories.
Swiss Giftliste 1
Melting point, °C
2000 - 2075
Boiling point, °C
Sublimation point, °C
2000 - 2500
3.33 g/cm3 (20 C)
Solubility in water
8.3E-6/K (20 C)
Hazards and Protection.
Store in a cool, dry place. Keep container closed when not in use.
Handle and store in a controlled environment and inert gas such as argon. Implement engineering and work practice controls to reduce and maintain concentration of exposure at low levels. Use good housekeeping and sanitation practices. Do not use tobacco or food in work area. Wash thoroughly before eating and smoking. Do not blow dust off clothing or skin with compressed air.
Wear safety glasses and chemical goggles if splashing is possible. Wear appropriate protective gloves and clothing to prevent skin exposure.
Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. While using the appropriate protective equipment, clean up spills immediately.
Stable under normal temperatures and pressures.
Strong oxidizing agents.
Irritating and toxic fumes and gases.
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. In case of fire, use water, dry chemical, chemical foam, or alcohol-resistant foam.
Moderate as dust exposed to air or by chemical reaction with oxidizing materials.
Interaction of powdered boron and steam may become violent at red heat. The highly exothermic reactions with water might become combustive or explosive processes at sufficiently high temperatures and pressures.
Significant ingestions or dermal exposures can be associated with weak, rapid pulse, cyanosis and abnormally low blood pressure. The patient may present with reduced body temperature, elevated body temperature or normal body temperature. Headache, lethargy, restlessness, weakness, CNS irritation, and/or seizures may occur with long term or repeated exposures. There is insufficient information concerning the reproductive effects of borates in humans. Adverse testicular effects and infertility have been reported in animals. <br>There have been limited animal studies which suggest decreased ovulation, fetotoxicity and developmental defects may occur with very high exposure levels. Maternal toxicity was present in some studies.
Nausea, vomiting, and diarrhea are common. The vomitus and feces may be blue-green in color. Hemorrhagic gastroenteritis can occur.
DANGER-POISON. May cause irritation to the mucous membrane and boron poisoning.
The oral mucosa, lips and throat may be red. Erythematous rash with desquamation (cooked lobster syndrome) may develop on the palms, soles, and buttocks. A generalized rash has also been reported.
May cause mild irritation.
Do NOT induce vomiting. Allow the victim to rinse his mouth and then to drink 2-4 cupfuls of water, and seek medical advice.
Remove from exposure to fresh air immediately.
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.