Talk:Carbon black

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)

A new study was just published in the eLifeSciences journal that links nanoparticulate carbon black from tobacco smoke to emphysema, and a companion study in another journal describes the mechanism of damage.

Not sure how to best rewrite the section to incorporate this information.

Crayz9000 (talk) 16:04, 11 October 2015 (UTC)

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)

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)

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)

Any chance that we could get a section explaining the difference? I feel like there is a high chance of people being confused here. 2_of_8 (talk) 18:25, 7 May 2010 (UTC)

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)

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)

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)

The photo of the man is not useful, certainly not as the first picture. I wanted to see a sample of the material in a petri dish. The caption of the picture of the man needs to explain why he's there. --Jra (talk) 11:52, 6 May 2009 (UTC)

I found the photo useful as an easy-to-understand illustration that carbon black is a useful industrial material. The article can say that, but it's much more effective to show it. If better images turn up we can of course use them, and move this image to lower in the article; but in the meantime it's the best image we have, so let's keep it. Eubulides (talk) 05:07, 27 May 2009 (UTC)

I agree with Jra. The photo is supremely awesome and bad-ass but I don't see how it is relevant enough to be the lead photo. --Thomasdelbert (talk) 20:28, 17 May 2012 (UTC)

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?

Global useage is about 70% in tyres, 20% in other rubber goods, and 10% combined in pigment uses in inks, coatings and plastics.Catwhoorg (talk) 14:59, 28 August 2008 (UTC)

Soot, Black Carbon, Carbon black

I think that we need to more clearly differentiate between this article, soot and Black carbon. I agree with the previous consensus that this article and Black carbon probably cover different enough topics that they should remain separate. However, I think that we need a hat note that more clearly distinguishes the topics. I also think that soot may be redundant and most of should be merged to black carbon. However, some people will be looking for information on the material which lines their chimney after a fire. So soot could cover that or be a disambiguation page. Finally I think that the lead of Black carbon needs to be broadened so that it mentions other aspects of BC in the atmosphere.

In summary the new articles would be:

• Carbon black. As at present but with a lead that clearly states it is about an industrial product.
• Black carbon. Expanded to cover all aspects of particulate elemental carbon in the atmosphere.
• Soot. A disambiguation page or a page covering the deposits of elemental carbon in chimneys, flues etc.

I would welcome some other ideas on this and I will post a note about this on the other two articles talk pages.--NHSavage (talk) 13:12, 7 October 2012 (UTC)

I agree with this. Shaded0 (talk) 06:59, 14 February 2013 (UTC)

I notice that while the lead states that carbon black is different from soot, having more surface area and less polycyclic aromatic hydrocarbons, the "Pigment" section states that carbon black "is known by a variety of names, each of which reflects a traditional method for producing carbon black:" including "Lamp black was traditionally produced by collecting soot, also known as lampblack, from oil lamps." If carbon black is not soot, this isn't correct. Should it say something more like "... a traditional source of black carbon pigments"? Wombat140 (talk) 17:22, 14 March 2014 (UTC)

Would it be possible to add the specification limits used to differentiate between carbon black and other forms of carbon (e.g. surface area....). When is carbon "carbon black" and when is it something else? — Preceding unsigned comment added by HeSeng (talk • contribs) 06:33, 2 May 2014 (UTC)

The requests by HeSeng are reasonable, but probably difficult to do in practice. Surface area, for example, depends in the case of bulk materials on the heating temperature, the composition and even the structure of the biomass or fuel source, the heating atmosphere and heating time. Also, in the case of particulate matter, the surface area increases as the size of the microscopic particles decreases (very small particles like pm2.5 have very large surface area). All of these materials have some similarity chemically and often the choice of the name of the material depends on its method of generation or source, e.g,. a wood fire, a combustion chamber or furnace, automobile and diesel exhaust etc. While "black carbon" is something of a catch all term, 'carbon black' is more specific in that it is prepared by especially designed reactors for commercial purposes. Another catch all term is simply "carbonaceous material", which tends to grab everything that is a product or residue of incomplete combustion containing a significant component of refractory carbon in the form of very large networks of fused aromatic rings (PAH's). "Black carbon" often is mentioned in terms of microscopic particulate matter in the atmosphere, it also can refer to the carbonaceous material in soil, whether or not it originated from the atmosphere. Nevertheless, my comments are meant to suggest that the inclusion of some descriptive definitions of these materials would be a very useful addition to the encyclopedic commentary because it is seldom presented anywhere else. There may be a good unified discussion in the literature somewhere, but I suspect that the relevant material is scattered around many sources in disparate places depending on whether these substances are discussed in combustion, atmospheric chemistry, chemical, engineering, environmental journals, textbooks etc. It can be done. Tachyon 00:32, 22 October 2014 (UTC) — Preceding unsigned comment added by Janopus (talk • contribs)

I came to the same conclusion. I tried to link this page with the Dutch one (about "roet"), but that is not possible as there is just one page for both soot and black carbon. This is very confusing. I also found scientific work pronounced the difference between these two. Josbert Lonnee (talk) 22:34, 29 December 2018 (UTC)

Carbon nanoparticles

Carbon nanoparticles redirects here. Is this correct? There is no mention of nanoparticles in the article. Biscuittin (talk) 12:28, 3 December 2015 (UTC)

That is very true. I have an article here about the use of "Black Carbon nanoparticles" being used for converting sunlight energy into heat (and it needs a home): https://www.sciencedaily.com/releases/2017/06/170619165423.htm Twillisjr (talk) 06:07, 13 August 2017 (UTC)

Opening sentence

The opening sentence is directly ripped from this website http://www.reade.com/products/carbon-black

"Carbon Black

Description A black, amorphous, carbon pigment produced by the thermal decomposition of natural hydrocarbons. There are three different types (furnace, channel, and lamp black).

Carbon black is a material produced by the incomplete combustion of heavy petroleum products such as FCC tar, coal tar, ethylene cracking tar, and a small amount from vegetable oil. Carbon black is a form of amorphous carbon that has a high surface area to volume ratio, although its surface area to volume ratio is low compared to activated carbon. It is dissimilar to soot because of its much higher surface area to volume ratio and significantly less (negligible and non-bioavailable) PAH content. Carbon black is used as a pigment and reinforcement in rubber and plastic products."

The vegetable oil claim is not readily backed up by, for example, the EPA's description of the process https://www3.epa.gov/ttnchie1/ap42/ch06/final/c06s01.pdf — Preceding unsigned comment added by 24.61.40.178 (talk) 09:36, 22 January 2018 (UTC)

CARBON BLACK PARTICLE SIZING IS WRONG

ASTM D1765-95 uses primary particle size to classify carbon black. The chart displayed has wrong values and overlapping ranges. More currently D1765-96 utilizes Nitrogen Surface area, not particle size. I suggest the new classification be displayed next to the corrected data and identified as Nitrogen surface area and the primary particle size data labeled as such with the addition of historic data.

Thanks!! Frank

Black carbon pigment

We used to mix it in a Banbury machine to make polyethylene plastics, the same as which colours the dashboard of lots of vehicles. 188.31.165.146 (talk) 21:43, 22 April 2022 (UTC)

Use in Batteries

• This seems to be a common use case
• Quick Search lead me to find these links:
  • https://www.orioncarbons.com/batteries
  • https://www.prnewswire.com/news-releases/carbon-black-in-lead-acid-battery-market-to-register-a-growth-of-usd-116-06-mn---technavio-301631875.html
  • https://pubs.rsc.org/en/content/articlelanding/2015/ra/c5ra19056h
• Should this be added to the page? If so how? — Preceding unsigned comment added by Eric Lotze (talk • contribs) 12:28, 27 September 2022 (UTC)

Wiki Education assignment: CHEM 300

This article was the subject of a Wiki Education Foundation-supported course assignment, between 6 September 2022 and 7 December 2022. Further details are available on the course page. Student editor(s): Greta Margaux, Mwongz, AccountAlias (article contribs). Peer reviewers: Elainewongso, Tsang Karl, Sheryl Munshan, Thebluecardigan, Aaronkroeker.

— Assignment last updated by Tiff592 (talk) 00:21, 27 October 2022 (UTC)

Use in lithium-ion batteries and other small updates to the page

I was thinking of adding a section talking about carbon black's uses in lithium-ion batteries. More specifically, the main ideas/topics that I wish to include:

1) That carbon black is a common conductive additive for lithium ion batteries thanks to their small particle sizes and large specific surface areas https://doi.org/10.1149%2F2.0401503jes and https://doi.org/10.1016/j.jpowsour.2021.230342

2) That unlike graphite, carbon black has crystal lattices that are further apart which promote Li+ intercalation which allows for more pathways for lithium storage

Sources for this point: https://doi.org/10.1016/j.jpowsour.2021.230342

3) That carbon black's low density allows for a large volume of it to be dispersed so that its conductive effects are applied evenly throughout the battery.

Sources for this point: https://doi.org/10.1149/2.0761507jes and https://doi.org/10.1016/S0378-7753(03)00250-7

4) That carbon black's random arrangement of crystals improves battery stability because it decreases the potential barrier for lithium intercalation

Sources for this point: https://doi.org/10.1016/j.jpowsour.2021.230342

5) The chemical surface structure of carbon black depicting functional groups that can decompose electrolyte and therefore affect the life cycle of batteries. Additionally, to also discuss how to mitigate the functional groups' affect on batteries.

Sources for this point: https://doi.org/10.1149%2F2.0401503jes

Apart from adding a section talking about carbon black's involvement in lithium ion batteries, some small changes/updates to the article I wish to make are:

1) adding an additional source to this sentence "However, carbon black is widely used as a model compound for diesel soot for diesel oxidation experiments.[2][better source needed]" I'm thinking of adding this source to help this statement: https://doi.org/10.1021/acs.langmuir.5b02017 Additionally, I want to update the existing source here with its actual DOI instead of a PDF. The actual DOI is: https://doi.org/10.1080/00102202.2012.664010

2) To update the common uses section to include lithium-ion batteries and mention briefly that its low cost and conductive effects make it a common additive. Mwongz (talk) 18:39, 16 November 2022 (UTC)

How produced?

The article needs more than just the 2 words "incomplete combustion" in the lede to describe the commercial manufacturing technique(s). Casey (talk) 03:19, 2 August 2023 (UTC)