Re: Tungsten Disulfide (WS2)
Material Safety Data Sheet
Chemical Name: TUNGSTEN DISULFIDE (M K Impex Product # MK-WS2-XX)
Trade Name/Synonyms: TUNGSTEN DISULFIDE, TUNGSTEN DISULPHIDE, TUNGSTEN SULFIDE
Chemical Family: REFRACTORY METAL SULFIDE
CAS Number: 12138-09-9 Formula: WS2 Molecular Weight: 248.02
PHYSICAL DATA
Appearance & Odor:
GRAYISH-BLACK POWDER, NO ODOR
Boiling Point: N/A
Vapor Pressure: (mm HG) N/A
Vapor Density: (air=1) N/A
Solubility in Water: INSOLUBLE
Specific Gravity: (H2O=1) 7.4
Percent Volatile by Volume: 0
Evaporation Rate: N/A
How Best Monitored: AIR SAMPLE
NON-HAZARDOUS INGREDIENTS
Material: TUNGSTEN DISULFIDE
Percent by Weight: 100
ACGIH TLV: 5MG/M3
LIMIT IS FOR INSOLUBLE COMPOUNDS AS W
HEALTH HAZARD DATA
ROUTES OF EXPOSURE: material can be inhaled, swallowed, or come in contact with the
skin or eyes.
EFFECTS OF OVEREXPOSURE: dust and inhalation may cause mild irritation of the nose
and throat. With the exception of TOW Russian studies that found early signs of pulmonary
fibrosis in some workers exposed to tungsten trioxide, tungsten metal, and tungsten carbide,
most studies have shown that insoluble tungsten compounds to be toxicologically inert. Skin
and eye contact may cause irritation due to the abrasiveness of the dust. Recent scientific
evidence indicates no adverse effects are likely from accidental ingestion of small amounts of
the material.
EMERGENCY AND FIRST AID PROCEDURES: inhalation- if symptoms of pulmonary
involvement develop, remove from exposure and seek medical attention; skin contact- if
irritation occurs, thoroughly wash affected area with mild soap and water and prevent further
contact, contact medical help if irritation persists; eye contact- if irritation occurs, flush with
copious amounts of a water, contact medical help if irritation persists; ingestion- if
substantial quantities are swallowed, give person (if conscious) a large quantity of water to
drink, induce vomiting, and seek medical attention; carcinogenic assessment- NTP Annual
Report, IARC monographs, et. al.) this material has not been identified as a known or
suspected carcinogen by NTP, IARC, or OSHA.
FIRE & EXPLOSION HAZARD DATA
Flash Point: N/A
Flammability Limits: N/A
NO FIRE HAZARD, USE EXTINGUISHING AGENTS SUITABLE FOR
SURROUNDING FIRE. SPECIAL PROCEDURES: USE A SELF-CONTAINED
BREATHING APPARATUS TO PREVENT INHALATION OF DUST, MIST OR FUMES
THAT MAY BE GENERATED DURING FIRE FIGHTING ACTIVITIES. NO UNUSUAL
FIRE OR EXPLOSION HAZARDS.
M K Impex Canada Page 2
REACTIVITY DATA
Stability: STABLE
Conditions to avoid: N/A
Incompatible Materials to Avoid: CONTACT WITH STRONG ACIDS MAY GENERATE
HYDROGEN SULFIDE
Hazardous Decomposition Products: OXIDES OF SULFUR AND TUNGSTEN MAY BE
EVOLVED AT EXTREME TEMPERATURES
SPILL & LEAK PROCEDURES
IF SPILLED OR RELEASED- VENTILATE AREA OF SPILL, CLEAN-UP USING
METHODS WHICH AVOID DUST GENERATION, SUCH AS VACUUMING WITH
APPROPRIATE FILTER, WET DUST MOP, OR WET CLEAN-UP. IF DUST IS
GENERATED, USE APPROVED NIOSH RESPIRATOR.
DISPOSAL-DISPOSE OF IN ACCORDANCE WITH APPROPRIATE FEDERAL,
STATE, AND LOCAL REGULATIONS
RESPIRATORY PROTECTION- USE AN APPROPRIATE NIOSH APPROVED
RESPIRATOR IF AIRBORNE DUST LEVELS EXCEED THE TLV, APPROPRIATE
REQUIREMENTS SET FORTH IN 29 CFR 1910.134 SHOULD BE MET
VENTILATION- USE LOCAL EXHAUST WHICH IS ADEQUATE TO LIMIT
EXPOSURE LEVELS BELOW TLV
GLOVES-GLOVES ARE RECOMMENDED
EYE PROTECTION- RECOMMENDED
SPECIAL PRECAUTIONS
Handling and Storage: MAINTAIN GOOD HOUSE KEEPING PROCEDURES TO
PREVENT ACUMULATION OF DUST; USE CLEAN-UP METHODS WHICH
MINIMIZE DUST GENERATION
Other Precautions:
WASH THROROUGHLY AFTER HANDLING AND BEFORE EATING, SMOKING,
AND END OF WORK SHIFT; DO NOT SHAKE CLOTHING TO REMOVE DUST;
AVOID INHALATION, INGESTION, AND DIRECT SKIN CONTACT
Although M K Impex Canada has attempted to provide current and accurate information
therein, M K Impex Canada makes no representations regarding the accuracy or
completeness of information and assumes no liability for any loss, damage, or injury of any
kind which may result from, or arise out of, the use of or reliance on the information by any
person.
Sold by:
M K Impex Canada
7432 Catalpa Road
Mississauga, Ontario L4T 2T3, Canada
Phone: 416-509-4462
Fax: 905-461-9238
www.lowerfriction.com [email protected]
