2-27B, #261-265 JIAHE RD,
CHINATUNGSTEN ONLINE
XIAMEN, FUJIAN, CHINA, 361009
Phone:锛?86锛?592-512-9696
MANU. & SALES CORP.
Fax:锛?86锛?592-512-9797
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 shoulsd 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 appropriate.
Material Percent by Weight OSHA PEL ACGIH TLV ACGIH STEL
Tungsten >99% --- 5 mg/m3 10 mg/m3
Values are for airborne powder and dust.
SECTION 3: PHYSICAL DATA
3410鈩?
Melting Point: Vapor Density(Air=1): NA
5900鈩?
Boiling point: Evaporation Eate: NA
Specific Gravity(H2O=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.
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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.
Unusual Fire and Explosion Hazards: Dust may present a fire or explosion hazard under favoring
conditions of particle size, dispersion, and strong ignition source. When tungsten is heated in air
above 750鈩?, tungsten trioxide sublimes (TLV 5 mg/m3).
SECTION 5: HEALTH HAZARD DATA
Routes of Exposure: Dust, mist and/or fumes fenerated 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 aymptoms 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 futher 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 awallowed, 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 ocidizers.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
wacuuming (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.
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Waste Disposal Method: Dispose of the material following all Local and national Regulations,
Tungsten 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 wacuuming 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 exported 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.
Periodic medical examinations are recommended for indiciduals regularly exposed to dust.
Although CHINATUNGSTEN ONLINE MANU. & SALES CORP. (ab.CTOMS) has attempted to
provide current and accurate information herein, CTOMS makes no representations regarding
the accuracy or completeness 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 procided for public display via the Internet
and is not provided in conjunction with any product sold by CTOMS .No warranty of CTOMS
products is expressed or implied by this document.
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