MATERIAL SAFETY DATA SHEET

I. PRODUCT IDENTIFICATION

Manufacturer/Supplier:

ESPI Metals

1050 Benson Way, Ashland, OR 97520

Toll Free (800) 638-2581 * Fax (541) 488-8313

E-Mail: sales@espimetals.com

Trade Name:                    Bismuth Telluride

Chemical Family:            Metal telluride

CAS #:                              1304-82-1

Formula:                           Bi₂Te₃

Synonyms:                        Bismuth tritelluride, natural tetradymite, bismuth sesquitelluride.

II. HAZARDOUS INGREDIENTS

Hazardous Components:    Bismuth Telluride

%:                                         0-100

OSHA/PEL:                         5 mg/m³

ACGIH/TLV:                      10 mg/m³

HMIS Ratings: Health: 2  Flammability: 0 Reactivity: 1 Protective Equipment: H: glasses, gloves, clothing, combo resp.

III. PHYSICAL DATA

Boiling Point (^OC):              N/E or N/A

Melting Point:                      573 ^oC

Specific Gravity:                  7.7 gm/cc @ 20 ^oC

Vapor Pressure:                  N/A

Vapor Density:                    N/A

Solubility in H₂O:                Decomposes

Appearance and Odor:       Grey powder and pieces, no odor

% Volatile:                           N/E or N/A

IV. FIRE AND EXPLOSION HAZARDS DATA

Flash Point: N/A

Autoignition Temperature: N/E

Explosive Limits: Lower: N/E        Upper: N/E

Extinguishing Media: Use suitable extinguishing media for surrounding material and type of fire. Do not use water.

Special Fire Fighting Procedures: Wear a self-contained breathing apparatus and full protective clothing to prevent contact with skin and eyes. Fumes from fire are hazardous. Isolate runoff to prevent environmental pollution.

Unusual Fire and Explosion Hazards: When heated to decomposition, bismuth telluride may emit toxic fumes of tellurium. May

react with water to evolve toxic gases. Moderate fire hazard by spontaneous chemical reaction with powerful oxidizing agents. Slight explosion hazard with moisture.

V. HEALTH HAZARD INFORMATION

Effects of Exposure:

To the best of our knowledge the chemical, physical and toxicological properties of bismuth telluride have not been thoroughly investigated and recorded.

Bismuth compounds are often poorly absorbed. However exposure may cause loss of appetite, headache, skin rash, exodermatitis, kidney injury and jaundice. Repeated or prolonged exposure may cause a bismuth line or black spots on the gums, foul breath and salivation. Exposure to bismuth may cause injury to the mouth, esophagus and stomach.

Tellurium is converted in the body to dimethyl telluride which imparts a garlic-like odor to the breath and sweat. Heavy exposures may result in headache, drowsiness, metallic taste, loss of appetite, nausea, tremors, convulsions, and respiratory arrest.

Acute Effects:

Inhalation: May cause irritation to the respiratory system, a dry mouth, metallic taste, gingivitis, garlic odor to breath, sweat and urine.

Ingestion: May cause a dry mouth, suppression of sweat, malaise, albuminuria, diarrhea, skin reactions, stomatitis, diarrhea, headache, fever, rheumatic pain, black line on gums, garlic odor to breath and urine.

Skin: May cause irritation and itching.

Eye: May cause irritation.

Chronic Effects:

Inhalation: May cause anorexia, nausea, depression, somnolence and affect the function of the liver and kidneys.

Ingestion: May cause anorexia, anemia, black line on gums, ulcerative stomatitis, nausea, depression and somnolence. May affect the function of the liver and kidneys.

Skin: May cause dermatitis.

Eye: No chronic health effects recorded.

Target Organs: May affect the skin, liver, kidneys and central nervous system.

Carcinogenicity: NTP: No              IARC: No          OSHA Regulated: No

Medical Conditions Generally Aggravated by Exposure: Pre-existing skin and respiratory disorders.

Routes of Entry: Inhalation, Skin, Eyes, Ingestion

EMERGENCY AND FIRST AID PROCEDURES:

INHALATION: Remove victim to fresh air, keep warm and quiet, give oxygen if breathing is difficult and seek medical attention.

INGESTION: Give 1-2 glasses of milk or water and induce vomiting, seek medical attention immediately. Never induce vomiting or give anything by mouth to an unconscious person.

SKIN: Remove contaminated clothing, brush material off skin, wash affected area with mild soap and water for 15 minutes, seek medical attention if symptoms persist.

EYE: Flush eyes with lukewarm water, lifting upper and lower eyelids, for at least 15 minutes. Seek medical attention if symptoms persist.

VI. REACTIVITY DATA

Stability: Stable

Conditions to Avoid: Water/moisture

Incompatibility: Strong acids, water/moisture and oxidizing agents.

Hazardous Decomposition Products: Metal oxide fume

Hazardous Polymerization: Will not occur.

VII. SPILL OR LEAK PROCEDURES

Steps to Be Taken in Case Material Is Released or Spilled: Wear appropriate respiratory and protective equipment specified in Section VIII. Isolate spill area and provide ventilation. Vacuum up spill using a high efficiency particulate absolute (HEPA) air filter and place in a closed container for proper disposal. Take care not to raise dust.

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

VIII. SPECIAL PROTECTION INFORMATION

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

Ventilation: Handle in a controlled environment. Handle in an inert gas such as argon. Use local exhaust to maintain concentration at or below PEL, TLV.

Protective Gloves: Neoprene

Eye Protection: Safety Glasses

Other Protective Equipment: Wear protective clothing to prevent contamination.

IX. SPECIAL PRECAUTIONS

Precautions to be Taken in Handling and Storing: Store in a cool, dry area, Wash thoroughly after handling. Store in tightly sealed container. Bismuth telluride may react with water. Handle and store in a controlled environment and inert gas such as argon.

Work Practices: 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.

Some of the chemicals listed herein are research or experimental substances which may be toxic, as defined by various governmental regulations. In accordance with Environmental Protection Agency regulation and the Toxic Substances Control Act

(TSCA), these materials should only be handled by, or under the direct supervision of, a "technically qualified individual", as defined in 40 CFR 710.2(aa).

DOT Regulations:

Hazard Class:                      None

The above information is believed to be correct, but does not purport to be all inclusive and shall be used only as a guide. ESPI shall not be held liable for any damage resulting from handling or from contact with the above product.

Issued by:            S. Dierks

Date:                    August 2006