タングステンカーバイド

Dry Powder; CBI

A mixture of tungsten carbide, cobalt, and sometimes other metals & metal oxides or carbides; [NIOSH]

A mixture of tungsten carbide, cobalt, and sometimes other metals & metal oxides or carbides.

Chemical: Tungsten carbide (WC)

Hazard Traits - Carcinogenicity

Tungsten carbide (WC) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Tungsten carbide (WC) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Tungsten carbide (WC): Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.

The tungsten carbide (WC) content is generally 85-95% and the cobalt content is generally 5-15%. [NIOSH] Hard metal lung disease is caused by the composite material, a mixture of cobalt and tungsten carbide; It is thought that inhaled cemented tungsten carbide injures the lung by releasing toxic oxygen species; Also may occur after exposure to cobalt metal powder mixed with iron and diamond dust in diamond polishers; There is no evidence that cobalt metal alone or other cobalt compounds can cause hard metal disease; [Nordberg, p. 753] Sprince and colleagues (1984) reported that interstitial and obstructive lung disease was found in 11 of 290 subjects who worked at two tungsten carbide production plants.' [ACGIH] Skin sensitization to cobalt can occur in the hard metal industries. [Marks, p. 79] See Tungsten. See Cobalt. This TLV is listed by ACGIH under Hard metals containing Cobalt and Tungsten carbide.

0.005 [mg/m3], as Co, thoracic particulate matter

Used to manufacture hard metal tools; [LaDou, p. 377] Occupational asthma reported in a metal grinder; [Malo] Used in construction, metalworking, mining, and oil/gas drilling industries; Workers exposed during tool grinding and saw blade sharpening/retipping; Exposure may occur during detonation gun welding; [ACGIH]

Metal Machining [Category: Heat or Machine]

Machinery Manufacturing

Tungsten carbide (WC): ACTIVE