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Tungsten carbide (cemented)
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]
CAS No. 1: 11107-01-0 2: 12718-69-3 3: 37329-49-0		RTECS No. 1: YO7350000 2: YO7525000 3: YO7700000		DOT ID & Guide
Formula WC/?Co/?Ni/?Ti		Conversion		IDLH N.D. See: IDLH INDEX
Exposure Limits NIOSH REL : See Appendix C OSHA PEL †: See Appendix C				Measurement Methods None available See: NMAM or OSHA Methods
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
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

Personal Protection/Sanitation (See protection codes) 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 quarter-mask respirator. Click here for information on selection of N, R, or P filters. Up to 0.5 mg Co/m³: (APF = 10) Any particulate respirator equipped with an N95, R95, or P95 filter (including N95, R95, and P95 filtering facepieces) except quarter-mask respirators. The following filters may also be used: N99, R99, P99, N100, R100, P100. Click here for information on selection of N, R, or P filters.* (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 high-efficiency particulate filter.* (APF = 25) Any powered, air-purifying respirator with a high-efficiency particulate filter.* Up to 2.5 mg Co/m³: (APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters. (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 an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters. Any appropriate escape-type, self-contained breathing apparatus Tungsten carbide (cemented) containing Nickel: 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 an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters. Any appropriate escape-type, self-contained breathing apparatus Important additional information about respirator selection
See also: INTRODUCTION

Syndicated Content Details:
Source URL: http://www.cdc.gov/niosh/z-lab-945/npg-syndicate/npgd0647.html
Source Agency: Centers for Disease Control and Prevention (CDC)
Captured Date: 2016-05-23 21:58:11.0

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