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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Tungsten-cobalt alloys extremely carcinogenic?
On 2011-05-03, Ned Simmons wrote:
On Tue, 03 May 2011 11:58:08 -0500, Ignoramus18758 wrote: A little distraction from our "show us Obama Bin Laden's death certificate" battles. I was reading this article. http://en.wikipedia.org/wiki/Depleted_uranium It says ``According to recent research,[28] at least some of the most promising tungsten alloys that have been considered as replacement for depleted uranium in penetrator ammunitions, such as tungsten-cobalt or tungsten-nickel-cobalt alloys, also possess extreme carcinogenic properties, which by far exceed those (confirmed or suspected) of depleted uranium itself: 100% of rats implanted with a pellet of such alloys developed lethal rhabdomyosarcoma within a few weeks. '' This, obviously, concerns me, since the end mills that I often use are made of tungsten/cobalt. Are they carcinogenic? Any comments? i Any effect is most likely due to the cobalt. As far as I know, and I do a lot of work in a plant that processes tungsten, tungsten is not a known carcinogen. When you speak of tungsten/cobalt end mill, I assume you mean tungsten carbide/cobalt. Re the cobalt: http://www.lenntech.com/periodic/elements/co.htm "Carcinogenicity- International Agency for Research on Cancer (IARC) has listed cobalt and cobalt compounds within group 2B (agents which are possibly carcinogenic to humans). ACGIH has placed cobalt and inorganic compounds in category A3 (Experimental animal carcinogen- the agent is carcinogenic in experimental animals at a relatively high dose, by route(s), histologic type(s), or by mechanism(s) that are not considered relevant to worker exposure.) Cobalt has been classified to be carcinogenic to experimental animals by the Federal Republic of Germany." Which I take to mean, unless you're making body piercings out of old carbide tools, don't worry about it I believe that cheap tungsten carbide jewelry on eBay is made of recycled end mills, with cobalt binding. The more expensive tungsten carbide jewelry is made with nickel binding. i |
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Tungsten-cobalt alloys extremely carcinogenic?
"Ignoramus18758" wrote in message ... On 2011-05-03, Ned Simmons wrote: On Tue, 03 May 2011 11:58:08 -0500, Ignoramus18758 wrote: A little distraction from our "show us Obama Bin Laden's death certificate" battles. I was reading this article. http://en.wikipedia.org/wiki/Depleted_uranium It says ``According to recent research,[28] at least some of the most promising tungsten alloys that have been considered as replacement for depleted uranium in penetrator ammunitions, such as tungsten-cobalt or tungsten-nickel-cobalt alloys, also possess extreme carcinogenic properties, which by far exceed those (confirmed or suspected) of depleted uranium itself: 100% of rats implanted with a pellet of such alloys developed lethal rhabdomyosarcoma within a few weeks. '' This, obviously, concerns me, since the end mills that I often use are made of tungsten/cobalt. Are they carcinogenic? Any comments? i Any effect is most likely due to the cobalt. As far as I know, and I do a lot of work in a plant that processes tungsten, tungsten is not a known carcinogen. When you speak of tungsten/cobalt end mill, I assume you mean tungsten carbide/cobalt. Re the cobalt: http://www.lenntech.com/periodic/elements/co.htm "Carcinogenicity- International Agency for Research on Cancer (IARC) has listed cobalt and cobalt compounds within group 2B (agents which are possibly carcinogenic to humans). ACGIH has placed cobalt and inorganic compounds in category A3 (Experimental animal carcinogen- the agent is carcinogenic in experimental animals at a relatively high dose, by route(s), histologic type(s), or by mechanism(s) that are not considered relevant to worker exposure.) Cobalt has been classified to be carcinogenic to experimental animals by the Federal Republic of Germany." Which I take to mean, unless you're making body piercings out of old carbide tools, don't worry about it I believe that cheap tungsten carbide jewelry on eBay is made of recycled end mills, with cobalt binding. The more expensive tungsten carbide jewelry is made with nickel binding. i I don't know anything about jewelry, but FYI, cobalt is a lot more expensive than nickel. -- Ed Huntress |
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