Talk:Carbon black

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Carcinogenity of carbon black

The article states: It is known to be carcinogenic and harmful to the respiratory tract if inhaled, because it contains large amounts of Polycyclic aromatic hydrocarbons.

Carbon Black MSDS shows that In 1995 IARC concluded, “There is inadequate evidence in humans for the carcinogenicity of carbon black.” Based on rat inhalation studies IARC concluded that there is, “sufficient evidence in experimental animals for the carcinogenicity of carbon black,” IARC’s overall evaluation was that, “Carbon black is possibly carcinogenic to humans (Group 2B)”. This conclusion was based on IARC’s guidelines, which require such a classification if one species exhibits carcinogenicity in two or more studies.

Columbian Chemicals MSDS is an example of an MSDS for a global supplier.

One problem with linking to such an MSDS is that it inevitably is a commercial site.

Other organisations cover the cacinogenicity of carbon black as well:

The American Conference of Governmental Industrial Hygienists (ACGIH) classifies carbon black as A4, Not Classifiable as a Human Carcinogen;

The German MAK Commission classifies carbon black as a suspect carcinogen category 3B;

The National Toxicology Program (NTP) has not listed carbon black as a carcinogen;

The Occupational Safety and Health Administration (OSHA) has not listed carbon black as a carcinogen;

The National Institute for Occupational Safety and Health (NIOSH) criteria document (1978)on carbon black recommends only carbon blacks with polycyclic aromatic hydrocarbon contamination levels greater than 0.1% (1,000 parts per million) be considered suspect carcinogens; and

The Office of Environmental Health Hazard Assessment (OEHHA) of the California Environmental Protection Agency added “carbon black (airborne, unbound particles of respirable size)” (CAS No. 1333-86-4) to the Proposition 65 substances list on February 21, 2003. This listing, triggered by the “authoritative body” mechanism in the California Code of Regulations, was based solely on IARC's 1996 reclassification of carbon black as a Group 2B carcinogen.

Taken from carbon black a users guide, which is a publication of the International Carbon Black assosciation. The member companies of the ICBA are Cabot Corporation, Cancarb Limited, Columbian Chemicals Company, Continental Carbon Company, Degussa Corporation, Degussa Engineered Carbons, Sid Richardson Carbon Company, and The Birla Group.

Its my opinion that the ICBA publication is the best way to cite relevant saefty information in a way that doesnt directly promote one manufacturer over another.

The 'known to be carcinogenic' in the article should also be downgraded to a 'suspect' or 'possible' carcinogen, but some discussion first is merited first with others. Catwhoorg 13:47, 3 January 2007 (UTC)[reply]

Merge with Black Carbon

Strong Oppose carbon black is an engineered nano-material produced under very controlled conditions. Black carbon is impure and a catch all term. Catwhoorg 21:23, 11 January 2007 (UTC)[reply]

Black carbon has nothing to do with carbon black. Can someone take the merge suggestion header off before it starts confusing readers? 24.235.229.183 01:14, 18 January 2007 (UTC)[reply]

I agree. Please take off the merge suggestion. The use of the term carbon black for black carbon is a mistake. --Gami 00:47, 11 February 2007 (UTC)[reply]

Removal of commercial site link

My last edit to the main page was the removal of a commercial link that was effectively an advert. Lets keep the article encylopedic and commercial free as far as we can. Catwhoorg 13:59, 5 February 2007 (UTC)[reply]

Update "Common Uses" section to include food coloring?

I was surprised there was no mention on this page of the use of carbon black as a food coloring agent, as I linked to this page from http://en.wikipedia.org/wiki/Licorice_candy. Can someone who knows better how to use Wiki possibly add this at some point along with other foods it may be used this way in? (Sorry, no username, this is my first edit, I'll go register shortly)

Conductivity in "Surface Chemistry" section

Can someone knowledgable comment on whether conductivity in this section refers to electrical or thermal conductivity?

RTKfan (talk) 16:48, 25 January 2008 (UTC)[reply]

Needs actual photographs

There's really no point in telling about high surface tension-to-volume ratio. People want to see it. —Preceding unsigned comment added by Dennisjiewenliu (talk • contribs) 01:55, 18 April 2008 (UTC)[reply]

Percentage Usage

The article states 70% is used in tyres. Then later that 20% is used in rubber hoses, belts and other products, the balence used in ink. Should that read 80% (70% tyres, 10% hose belts etc, 20% ink and other) or is it to read that 70% is tyres, 20% other items, leaving 10% for ink etc. Certainly needs some calrification there i feel?