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MSDS Material Safety Data Sheet
CAS

7440-33-7

File Name: 7440-33-7.asp

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MATERIAL SAFETY DATA SHEET

SECTION 1: MATERIAL IDENTIFICATION

Chemical Name: Tungsten metal

Trade name and synonyms: Wolfram

Chemical Family: Refractory Metal (non-ferrous metal)

Formula: W

CAS Number: 7440-33-7


SECTION 2: HAZARDOUS INGREDIENTS

The terms 鈥渉azardous鈥? and 鈥渉azardous materials鈥? as used within this MSDS should be interpreted as defined by,
and in accordance with, the OSHA Hazard Communication Standard (29 CFR Part 1910, 1200) including cited
Appendices, Lists, References, etc., all of which are hereby incorporated by reference and stated below as appro-
priate.


Material Percent by OSHA ACGIH ACGIH
Weight PEL TLV STEL

5 mg/m3 10 mg/m3
Tungsten > 99% ---

Values are for airborne powder and dust.


SECTION 3: PHYSICAL DATA

Melting Point: 3410掳C Vapor Density (Air=1) NA

Boiling point: 5900掳C Evaporation Rate: NA

Specific Gravity (H20=1): 19.3 Solubility in Water: Insoluble

Vapor Pressure (mm Hg): NA Percent Volatile by Volume: 0

Appearance and odor: Gray metal/no odor


SECTION 4: FIRE AND EXPLOSION DATA

Flash Point: NA

Flammable Limits: NA

Extinguishing Media: Class D. Tungsten Dust (for example, from grinding) may present a moderate fire hazard if
allowed to accumulate and exposed to an ignition source. Cover burning material with and inert powder, such as
dry sand or limestone, to exclude oxygen. Wrought products do not readily burn.
Special Fire Fighting Procedures: For a powder fire confined to a small area, use a respirator approved for
toxic dusts and fumes. For a large fire involving this material, firefighters should use self-contained breathing
apparatus.

Unusual Fire and Explosion Hazards: Dust may present a fire or explosion hazard under favoring condi-
tions of particle size, dispersion, and strong ignition source. When tungsten is heated in air above 750掳C,
tungsten trioxide sublimes (TLV 5mg/m3).


SECTION 5: HEALTH HAZARD DATA

Routes of Exposure: Dust, mist and/or fumes generated during physical or metallurgical treatment may be
inhaled, swallowed or come in contact with skin or eyes.

Effect of Overexposure: Dust, mist and fumes generated during physical or metallurgical treatment may
cause mild irritation of the nose and throat. With the exception of two 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 tungsten to be toxicologically inert. Skin and eye contact may cause irritation due to
abrasive action of the dust. Current scientific evidence indicates no adverse effects are likely from accidental
ingestion of small amounts of tungsten.

Emergency and First Aid Procedures: Applicable for pure tungsten Dust, Mist and Fumes

Inhalation: If any symptoms of pulmonary involvement develop, remove from exposure and seek medical
attention. Aid breathing if necessary.

Skin Contact: If irritation occurs, thoroughly wash affected area with mild soap and water and prevent further
contact. If irritation persists, seek medical attention.

Eye Contact: If irritation occurs, flush with copious amounts of water for 15 minutes. If irritation
persists, seek medical attention.

Ingestion: If substantial quantities of dusts are swallowed, give person, if conscious, a large amount of water,
induce vomiting and seek medical attention.

Carcinogenic Assessment (NTP annual report, IARC Monagraphs, other) Tungsten has not been identified as
known or suspected carcinogens by NTP, IARC or OSHA.


SECTION 6: REACTIVITY DATA

Stability: Tungsten is stable.

Incompatibility (materials to avoid): Tungsten is very slightly soluble in nitric acid, sulfuric acid, and aqua
regia. It is soluble in a mixture of hydrofluoric acid and nitric acid. Avoid oxidizers. Vigorous reaction with
bromine trifluoride. Lead oxide mixed with tungsten becomes incandescent upon heating. Tungsten becomes
incandescent in cold fluorine. Iodine pentafluoride reacts spontaneously with tungsten with incandescence.

Hazardous Decomposition Products: None

Hazardous Polymerization: Will not occur


SECTION 7: SPILL OR LEAK PROCEDURE

For dust: Ventilate area of spill. Clean-up using methods which avoid dust generation such as vacuuming
(with appropriate filter to prevent airborne dust levels which exceed the TLV or PEL), wet dust mop or wet
clean-up. If airborne dust is generated, use an appropriate NIOSH approved respirator.
Waste Disposal Method: Dispose of the material following all Federal, State, and Local Regulations. Tung-
sten scrap, dust, and recovered fume have value.


SECTION 8: SPECIAL PROTECTION INFORMATION

Respiratory Protection: None needed for wrought products. When cutting, heating in air,grinding,etc.,use
an appropriate NIOSH approved respirator if airborne concentrations exceed the TLV or PEL. All appropriate
requirements set forth in 29 CFR 1910.134 should be met.

Ventilation: Use local exhaust ventilation which is adequate to limit personal exposure to levels which do not
exceed the TLV or PEL. If such equipment is not available, use respirators as specified above. No ventilation
is required for wrought products as supplied.

Protective Gloves: Gloves are recommended when contact is likely.

Eye protection: Safety glasses or goggles are recommended.

Other protective equipment: NA


SECTION 9: SPECIAL PRECAUTIONS

Precautions To Be Taken In Handling and Storage: Maintain good housekeeping procedures to prevent
accumulation of dust from grinding, etc. Use clean-up methods which minimize dust generation such as
vacuuming or wet clean-up.

Other Precautions: Mists from wet grinding or cutting may contain tungsten particles; if TLV is exceeded,
wear NIOSH approved respirator. Wash hands thoroughly after handling dust, before eating or smoking.
Wash skin exposed to dust at the end of work shift. Do not shake clothing, rags or other items to remove dust.
Dust should be removed by washing or vacuuming (with appropriate filters) the clothing, rags, or other items.

NOTE: Reported in EPA TSCA inventory, 1980.

Periodic medical examinations are recommended for individuals regularly exposed to dust.




Although MIDWEST TUNGSTEN SERVICE, INC. has attempted to provide current and accurate information
herein, MIDWEST TUNGSTEN SERVICE, INC. makes no representations regarding the accuracy or com-
pleteness of the information and assumes no liability for any loss, damage, injury of any kind which may result
from or arise out of the use of or reliance on the information by any person. The data contained on this sheet
was provided for public display via the internet and is not provided in conjunction with any product sold by
MIDWEST TUNGSTEN SERVICE, INC. No warranty of MIDWEST TUNGSTEN SERVICE, INC. products is
expressed or implied by this document.

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