MATERIAL SAFETY DATA SHEET







I       PRODUCT IDENTIFICATION



Trade Name:      Gallium Selenide                                              Chemical Family:          Metal Selenide

Synonyms:        Gallium Sequiselenide, Digallium Triselenide                  Formula:                  Ga2Se3

CAS #:           14024-24-7





II      HAZARDOUS INGREDIENTS



Gallium Selenide %:                TLV:                               OSHA PEL:

                                   not set 0.2 mg/m3 (Se)             0.2 mg/m3 (Se)

100



HMIS Hazard Rating: Health: 3                Flammability: 0          Reactivity: 1              Personal Protection: F





III     PHYSICAL DATA



Boiling Point (oC):                                                             Melting Point (oC):

                          No Data                                                                      >1020

Density (gm/cc):          4.92                                                  % Volatiles by Weight: N/A

Solubility in H2O:        Decomposition in H2O to give H2Se

Reaction with H2O:        Decomposition in H2O to give H2Se

Appearance and Odor:      Reddish-black crystals. Odorless (Slight garlic odor possible.)





IV      FIRE AND EXPLOSION HAZARDS DATA



Flash Point (Method Used): N/A                                                 Autoignition Temperature: N/A

Flammability: Non-flammable                                                    Flammable Limits: Upper: N/A Lower: N/A



Extinguishing Media: DO NOT USE WATER!! Use dry chemical, CO2.

Special Fire Fighting Procedures: Wear a self-contained breathing apparatus with full protective clothing to prevent contact with

skin and eyes.



Unusual Fire & Explosion Hazard: When heated to decomposition, it emits highly toxic fumes of Se. Material may form toxic

H2Se on contact with water/moisture of acids/acidic fumes.





V       HEALTH HAZARD INFORMATION



Toxicity Data: No information is available



Se Data: orl-mus TDLO: 134 mg/kg (MGN); ihl-rat LDLO: 33 mg/kg/8H; ivn-rat LD50: 6 mg/kg; unk-frg LDLO: 3 mg/kg

Ga Data: scu-rat 110 mg/kg MLD



Route(s) of Entry: Inhalation, Skin, and Ingestion.



Effects of Over Exposure:



Inhalation: May cause sneezing, coughing, difficulty breathing and irritation of the mucous membrane of the respiratory tract.

Dermal/Eye Contact: Dermal: May cause irritation, itching, inflammation and dermatitis. Eye: May cause burning sensation,

irritation, redness and watering of the eyes if comes in contact.

Se compounds: Highly toxic via intravenous and inhalation routes. An experimental carcinogen. Long-term exposure may be a

cause of amyotrophic lateral sclerosis in humans. Elemental selenium has low acute systemic toxicity, but dust fumes can cause

dermatitis. Imparts a garlic odor to the breath. Pallor, nervousness, depressions and digestive disturbances have been reported in

cases of chronic exposure.



          Metallic gallium as well as the nitrate produced no skin injury and subcutaneous injection of relatively large amounts could

be tolerated both by rabbits and rats without evidence of injury. It has, however, been demonstrated that gallium remains in the

tissues for long periods.



Medical Conditions Generally Aggravated by Exposure: Respiratory disorders.

Carcinogenicity: Suspected (Se): NTP? No       IARC Monographs? No                        OSHA Regulated? No



EMERGENCY AND FIRST AID PROCEDURES:



EYE CONTACT: Flush eyes with lukewarm water for at least 15 minutes, and seek medical attention.

SKIN CONTACT: Brush off skin, wash area with soap and water and seek medical attention.

INHALATION: Remove to fresh air; give oxygen if breathing is difficult. Seek medical attention.

INGESTION: Give 1-2 cups of milk or water and induce vomiting. Seek medical attention.





VI       REACTIVITY DATA



Stability: Stable

Incompatibility (Material to Avoid): Strong acids, strong bases, oxidizers and moisture/air.



Hazardous Decomposition Products: Ga, GaOx, Se, SeOx and H2Se.

Hazardous Polymerization: Will not occur.

Conditions to Avoid: Heat, flame and incompatible materials.





VII      SPILL OR LEAK PROCEDURES



Steps to Be Taken in Case Material Is Released or Spilled: Wear a self-contained breathing apparatus and full protective clothing.

Isolate the area where the spill occurred, insure proper ventilation is available and that water/moisture are kept out of the area.

Vacuum up the spill using a high efficiency unit and place in a container for proper disposal. Take care not to raise dust.



Waste Disposal Method: Dispose of in accordance with applicable Federal, State and Local regulations.





VIII     SPECIAL PROTECTION INFORMATION



Respiratory Protection (Specify Type): Wear NIOSH-approved dust-mist-fume cartridge respirator.



Ventilation: Local exhaust: Maintain exposure below TLV level for Se.

Special: Handle in a dry, inert, controlled environment.                         Mechanical: Not recommended.



Eye Protection: Safety glasses                                                   Protective Gloves: Neoprene





IX       SPECIAL PRECAUTIONS



Other Handling and Storage Conditions: Store in tightly closed containers in a cool, dry place. Wash hands and face thoroughly

after handling and before meals.





Issued By:        S. Dierks

Dated:            January 1994