Boron

  • Trona
Formula
B
Structure
Description
Gray-brown powder. No odor.
Uses
In nuclear chemistry as neutron absorber, in ignitron rectifiers, in alloys, usually to harden other metals.

Registry Numbers and Inventories.
CAS
7440-42-8
EC (EINECS/ELINCS)
231-151-2
RTECS
ED7350000
RTECS class
Other
Merck
12,1373
Beilstein/Gmelin
16262 (G)
EPA OPP
128945
Swiss Giftliste 1
G-7870
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
B
Formula mass
10.81
Melting point, °C
2000 - 2075
Boiling point, °C
2550
Sublimation point, °C
2000 - 2500
Density
3.33 g/cm3 (20 C)
Solubility in water
insoluble
Thermal expansion
8.3E-6/K (20 C)

Hazards and Protection.
Storage
Store in a cool, dry place. Keep container closed when not in use.
Handling
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.
Protection
Wear safety glasses and chemical goggles if splashing is possible. Wear appropriate protective gloves and clothing to prevent skin exposure.
Respirators
Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.
Small spills/leaks
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.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Irritating and toxic fumes and gases.

Fire.
Fire fighting
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.
Fire potential
Moderate as dust exposed to air or by chemical reaction with oxidizing materials.
Hazards
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.
Health
2
 
Flammability
3
 
 
Reactivity
0
 

Health.
Poison_Class
-
Exposure effects
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.
   Ingestion
Nausea, vomiting, and diarrhea are common. The vomitus and feces may be blue-green in color. Hemorrhagic gastroenteritis can occur.
   Inhalation
DANGER-POISON. May cause irritation to the mucous membrane and boron poisoning.
   Skin
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.
   Eyes
May cause mild irritation.

First aid
 
   Ingestion
Do NOT induce vomiting. Allow the victim to rinse his mouth and then to drink 2-4 cupfuls of water, and seek medical advice.
   Inhalation
Remove from exposure to fresh air immediately.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
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.

Transport.