NIOSH Pocket Guide to Chemical Hazards

Tungsten carbide (cemented) CAS 1: 11107-01-0
2: 12718-69-3
3: 37329-49-0
WC/Co/Ni/Ti RTECS 1: Y07350000
2: Y07525000
3: YO7700000
Synonyms & Trade Names
Cemented tungsten carbide, Cemented WC, Hard metal [Note: The tungsten carbide (WC) content is generally 85-95% & the cobalt content is generally 5-15%.] [1: 85% WC, 15% Co 2: 92% WC, 8% Co 3: 78% WC, 14% Co, 8% Ti]
DOT ID & Guide
Exposure
Limits
NIOSH REL: See Appendix C
OSHA PEL�: See Appendix C
IDLH N.D. Conversion
Physical Description
A mixture of tungsten carbide, cobalt, and sometimes other metals & metal oxides or carbides.
Properties vary depending upon the specific mixture.











Incompatibilities & Reactivities
Tungsten carbide: Fluorine, chlorine trifluoride, oxides of nitrogen, lead dioxide
Measurement Methods
None available
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated/Daily (Ni)
Remove: When wet or contaminated
Change: Daily

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash
Breathing: Fresh air
Swallow: Medical attention immediately
Respirator Recommendations NIOSH
Up to 0.25 mg Co/m3: (APF = 5) Any dust and mist respirator^
Up to 0.5 mg Co/m3: (APF = 10) Any dust and mist respirator except single-use and quarter-mask respirators*^/(APF = 10) Any dust, mist, and fume respirator*/(APF = 10) Any supplied-air respirator*
Up to 1.25 mg Co/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(APF = 25) Any powered, air-purifying respirator with a dust and mist filter*^/(APF = 25) Any powered, air-purifying respirator with a dust, mist, and fume filter*
Up to 2.5 mg Co/m3: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece
Up to 20 mg Co/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
Emergency or planned entry into unknown concentrations or IDLH conditions: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure- demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
NIOSH*
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure- demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
[*Note: Respirator for Tungsten carbide (cemented) containing Nickel.]
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, respiratory system; possible skin sensitization to cobalt, nickel; diffuse pulmonary fibrosis; loss of appetite, nausea, cough; blood changes
Target Organs Eyes, skin, respiratory system, blood
See also: INTRODUCTION