MATERIAL SAFETY DATA SHEET

Product Name: Osmium Tetroxide

Catalog Number: 20275, 20280

DOT Hazard Class: 6.1 (Toxic)

DOT Proper Shipping Name: Osmium Tetroxide

UN/NA ID No.: UN 2471

MSDS Updated: 9/16/05

Distributed By: Ladd Research

83 Holly Court

Williston, VT 05495

(802) 658-4961

HAZARDOUS COMPONENTS

CAS Number Percent Exposure Limits

Osmium tetroxide 20816-12-0 100% 0.002 mg/m³ (OSHA PEL)

0.002 mg/m³ (ACGIH TLV)

PHYSICAL AND CHEMICAL DATA

Boiling Point: sublimes at 130EC

Specific Gravity: 4.91

Vapor Pressure: 11 mm Hg @ 27EC

Vapor Density: Not established

Melting Point: 40-42EC (softens at 35EC)

Evaporation Rate: Not established

Solubility in Water: 5 g/100 ml (cold); 6 g/100 ml (hot)

Appearance and Odor: Pale yellow crystalline solid. Sharp chlorine-like odor.

FIRE AND EXPLOSION HAZARD DATA

Flash Point: Not applicable

Extinguishing Media: Water spray or carbon dioxide. DO NOT use organics

Special Fire Fighting Procedures: Use self-contained breathing apparatus with full face piece and full protective clothing.

Unusual Fire and Explosion Hazards: This product is a strong oxidizer and may react explosively with many organic compounds.

HEALTH HAZARD DATA

Primary Routes of Entry: Inhalation, skin, ingestion

Inhalation: Coughing, shortness of breath, unconsciousness. Could cause tracheitis, bronchitis, bronchial spasm which may lead to inflammatory lesions of the lung.

Skin: Dermatitis, possible skin discoloration (green or black)

Ingestion: Irritation, cough, dyspnea, death

Eyes: Irritation, lacrimation, visual disturbance, conjunctivitis, headache and corneal damage.

EMERGENCY AND FIRST AID

Eye: Flush thoroughly with water. If discomfort occurs or persists, seek medical assistance

Skin: Flush area with water and wash with soap and water. If discomfort occurs or persists, contact a physician.

Inhalation: Remove to fresh air. If breathing has stopped, perform artificial respiration.

Ingestion: Give large amounts of water and induce vomiting unless person is unconscious. Seek medical attention immediately.

REACTIVITY DATA

Stability: Stable

Incompatibility: Organic materials and hydrochloric acid

Hazardous Decomposition Products: None

Hazardous Decomposition: Will not occur

SPILL, DISPOSAL AND STORAGE INFORMATION

Spill: Sweep up or cover spill with dry sand or vermiculite and mix well. Place in a sealed container taking care to avoid dusting.

Disposal: Place in a sealed container and store in a safe location until disposal by a qualified waste disposal company. Please consult local, state and federal regulations before proceeding. (Please Note: Spent osmium may be recovered and refined.)

Storage: Store away from light in tightly sealed glass containers. Keep away from heat. Keep away from combustible materials.

PROTECTIVE EQUIPMENT AND CONTROL MEASURES

Respiratory: Chemical cartridge respirator for acid gases.

Gloves: Rubber, neoprene

Eye: Full face mask

Ventilation: Local exhaust recommended. Use efficient fume hood.

SECTION 313 SUPPLIER NOTIFICATION

This chemical is subject to the reporting requirements of Section 313 of SARA Title III.

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The information presented is believed to be correct and is the most accurate information available to us at this time. However, Ladd Research makes no warranty, express or implied, and assumes no liability for this information and the product described herein.