Gallium arsenide

  • Gallium monoarsenide
Formula
GaAs
Structure
Description
Dark gray crystals with a metallic greenish-blue sheen or gray powder.
Uses
In semiconductor applications (transistors, solar cells, lasers).

Registry Numbers and Inventories.
CAS
1303-00-0
EC (EINECS/ELINCS)
215-114-8
RTECS
LW8800000
RTECS class
Tumorigen; Reproductive Effector
UN (DOT)
1557
Merck
12,4365
Beilstein/Gmelin
49071 (G)
RCRA
D004
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
AsN
Formula mass
144.64
Melting point, °C
1238
Density
5.32 g/cm3

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear a NIOSH-approved half face respirator equipped with an organic vapor/acid gas cartridge (specific for organic vapors, HCl, acid gas and SO2) with a dust/mist filter.
Small spills/leaks
If you spill this chemical, you should dampen the solid spill material with water, then transfer the dampened material to a suitable container. Use absorbent paper dampened with water to pick up any remaining material. Seal your contaminated clothing and the absorbent paper in a vapor-tight plastic bag for eventual disposal. Wash all contaminated surfaces with a soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.
Stability
No data.
Incompatibilities
Can react with steam, acids and acid fumes Reacts with bases with evolution of hydrogen Attacks quartz.

Fire.
Fire fighting
Fires involving this material can be controlled with a dry chemical, carbon dioxide or Halon extinguisher.
Fire potential
This material is probably combustible.
Hazards
Containers may explode when heated.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
1
 
 
Reactivity
2
 
 
Special
W

Health.
Exposure limit(s)
3 µg/m3 TLVH
Carcinogin
O, G-A3H, I-1, N-1, CP65
Exposure effects
Peripheral neuropathy may develop. Gallium arsenide is not an animal teratogen.
   Ingestion
Nausea, vomiting, diarrhea, and abdominal pain may occur.
   Inhalation
Direct lung injury, pulmonary edema, or fibrosis may occur, based on experimental animal studies.
   Skin
Gallium has induced rash, itching, and edema.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
1557
Response guide
Hazard class
6.1
Packing Group
I; II; III