Material Safety Data Sheet (MSDS) for Tungsten Disulfide (WS2)

Product Identification

Specification: Data:
Product NameTungsten Disulfide
Product CodeN/A
Chemical NameTungsten Disulfide
Chemical FamilyRefractory Metal Sulfide
CAS Number12138-09-9
Molecular Weight248.02

Identity Information

Specification: Data:
Chemical FormulaWS2

Hazardous Ingrediants

Specification: Data:
Primary routes of entryInhalation, Ingestion, Skin or Eye contact (for dusts, mists, powder, and fumes)
Effects of overexposureTungsten Disulfide does not constitute an important health hazard, exposure is related chiefly to the dust arising out of the crushing and milling operations. Chronic inhalation of the dust may cause lung damage in humans.
Carcinogenic AssessmentNot Listed

Physical and Chemical Properties

Specification: Data:
Physical FormPowder
OdorNone - slight
Boiling PointN/A
Melting PointDecomposes slowly in air at 1,000°F. >3350°F in inert atmosphere.
Vapor PressureN/A
Vapor DensityN/A
Evaporation RateN/A
Solubility in WaterNone
Specific Gravity0.75g/cm3
Percenty Volatiles by VolumeN/A

Fire and Explosion Data

Specification: Data:
Flash PointN/A
Extingsuishing MediaClass D fire extinguishing agents, dry powder, or other agent suitable for the surrounding fire.
Special ProceduresFor a powder fire confined to a small area: Use a respirator approved for smoke, toxic dust and mites. For a large fire: Use self contained breathing apparatus.
Unusual HazardsDusts may present a fire or explosion hazard under fire favoring conditions of particle size, dispersion, and strong ignition source. However, this is not expected to be a problem under normal handling conditions

Human Health Data

Specification: Data:
Route of Entry - InhalationYes
Route of Entry - SkinNo
Route of Entry - IngestionYes
Health hazard acute and chronicAcute: Inhalation of tungsten disulfide may or may not cause transient or permanent lung damage. Inhalation may cause irritation of the nose and throat. Most studies have shown insoluble tungsten compounds to be toxicologically inert. Tungsten Disulfide may cause skin and eye irritation typically due to the abrasive nature of the powder. However, these effects are generally only found when there is concurrent exposure to other dust(s).

Emergency and first aid procedures

Specification: Data:
First aid for eyesIf irritation occurs, flush with a large amount of water for at least 15 minutes. If irritation persists, seek medical attention.
First aid for skinWash with soap and water. If irritation or rash occurs, isolate from exposure. If rash persists, seek medical attention.
First aid for InhalationIf large amount of dust are inhaled, move the exposed person to fresh air. If necessary, perform artificial respiration and seek medical attention.
First aid for IngestionIf ingested, get medical attention. Give large quantities of wataer and induce vomiting. Do not make unconsious person vomit.

Precations for safe handling and use

Specification: Data:
If material released/spilledAvoid dust generation. Do not cause material to become airborne. Provide adequate ventilation. If TLV is exceeded, clean up personnel need NIOSH/MSHA approved dust respirator. Vacuum (with appropriate filter to prevent airborne dust level which exceeds TLV) or wet dust mop or other wet clean up method.
Neutralizing AgentNone
Waste Disposal MethodDisposal must be in accordance with appropriate loca, state, and federal regulations.
Handling/Storing PrecautionsMaintain good housekeeping procedures to prevent dust accumulation. Wash exposed skin at end of work shift. Do not shake clothing, rags, or other items to remove dust.
Other PrecautionsDust should be removed by washing/vacuuming (with appropriate filters) the clothing, rags, or other items. Periodic medical examinations are required for individuals regularly exposed to dust.

Control Measures

Specification: Data:
Respiratory ProtectionNIOSH/MSHA approved dust respirator is required if TLV is exceeded. All appropriate requirements set forth in 29 CFR 1910.134 should be met.
VentilationGeneral and local ventilation is recommended. Use local exhaust ventilation, which is adequate to limit personal exposure to levels, which do not exceed the TLV. If such equipment is not available use respirators as specified above.
Protective GlovesImpervious gloves are recommended when contact is likely.
Eye ProtectionSafety goggles or glasses recommended
Other Protective EquipmentNone under normal conditions.
Work Hygienic practicesWash hands thoroughly after handling, before eating or smoking.
Explosive HazardDepending upon particle size, dispersion, and exposure to ignition source. This is not expected under normal conditions. Ammonium Metatungstate, particularly powder less than 1 micron (FSSS) can be ignited in air by friction during blending, milling, etc., If over blended, over milled, etc. Fine powders may ignite spontaneously in air.

Toxicological Information

Tungsten Disulfide itself does not constitute an important health hazard; exposure is related chiefly to any dust created. Heavy exposure to the dust or the ingestion of large amounts of the soluble compounds produces changes in body weight, behavior, blood cells, colin activity, and sperm in experimental animals

Ecological Information

Not available at this time.

Disposal Considerations:

This material must be disposed of in accordance with any and all applicable local, state, and federal regulations. Material intended for disposal may be sold as scrap for reclaim.

Transport Information

This material must be stocked in dry, ventilated place without acid, alkali. Avoid getting wet during transit.

Regulatory Information

Not available at this time.

Reactivity Data

Specification: Data:
Conditions to avoidN/A
Incompatitbility (materials to avoid)Contact with strong acids may generate hydrogen sulfide
Hazardous decomposition productsOxides of sulfur and tungsten may be evolved at extreme temperatures.
Hazardous PolymerizationWill not occur
Conditions to avoidN/A