Talk:Natural rubber

message: crap seems to be a great deal of stuff here that is overlapping with the latex page.  There should be some better coordination between these two.  Also it is worth noting that there are many types of rubber aside from Latex that are not addressed by this article.  I almost think that a great deal of this content should be merged into the Latex page. Locke9k 
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The following was moved from the aricle page: olivier 04:48 Nov 27, 2002 (UTC)
Can anyone expand on this article? I wrote the very first bit, but I have no information on how synthetic rubber is produced! Mark Ryan
Can anyone please expand the uses section of this page?--Brijeshhsejirb 05:37, 5 November 2006 (UTC)
thread_title: Untitled

message: I moved the recent addition on Asian natural rubber to the previous paragraph, which deals with natural [rubber]. I removed the blight concern and link, because there is nothing remarkable that people might be concerned with a crop blight: this is true for any crop, and unless we go into it in some depth — which would be interesting — the squib of sentence was not useful. The link was to a syllabus; from long experience on my own website, syllabus pages very often disappear when the quarter or semester is over. — Bill 17:20, 15 Feb 2005 (UTC)
thread_title: Edit

message: Synthetic rubbers have fundamentally different properties to natural rubbers and are therefore used for different purposes.  For example, nitrile rubber has decreased permeability to many solvents and increased abrasion resistance.
I'd suggest the article needs an update as natural rubber and synthetic rubbers need to be more clearly delineated.  Also a short monologue on chemical additives and potential allergies would be of use as they are of fundamental importance to a significant minority (natural rubber can cause a potentially fatal allergy).
I will try to address this in the coming weeks.
--John Spashett 09:29, 12 Jun 2005 (UTC)
thread_title:  Synthetic vs Natural 

message: C an you help me?
I want to know something about Kautschuk.
The spelling is Caoutchouc.
Caoutchouc is a vegetable gum produced by certain South American trees.
Caoutchouc was named rubber in 1770 by the English chemist Insert non-formatted text here, because it was used to rub out black lead marks. G4sxe 19:03, 5 January 2006 (UTC)
thread_title:  Kautschuk 

message: What is India rubber? It doesn't have an entry and could do with one. Cutler 08:06, July 30, 2005 (UTC)
India rubber comes from the India Rubber Tree, Ficus elastica.
The milky sap or latex was once an important source of natural rubber, but it was of inferior quality.G4sxe 00:26, 6 January 2006 (UTC)
thread_title:  India rubber 

message: Does anyone know exactly why rubber streches? what are the mechanics involved? i have heard two theories, and i was wondering which of them (if either) is true:
* elasticity is caused by the bonds along the carbon backbone of a polymer bending back and form, with the bonds always reforming the prefered angle of 109°
* carbon to carbon bonds stretching laterally, with the electrostatic attraction reasserting the original dimensions
i realise that they are both very similar, and in reality the reasoning is probably somewhere inbetween. could an expert please explain, and type it into the article? cheers, 
mastodon 20:50, 4 November 2005 (UTC)
replies: text:  Both theories are incorrect. The reason rubber stretches is mainly entropic (straightening of chains), not electrostatic (bending and stretching of bonds). See article. Klafubra 19:25, 6 May 2006 (UTC)
thread_title:  Theory behind elasticity 

message: Does anyone know exactly why rubber erases the pencil? what is the phenomenom? What are the forces involved?
:First of all, remember to sign your posts with four tildes (~~~~) so we know who you are. To answer your question, the reason rubber erases pencil is that the abrasives in the rubber eraser scratch the surface of the paper. This loosens some of the graphite particles, which lock onto the eraser. This is possible because of friction. TL The Legend (T) 18:08, 28 March 2019 (UTC)
thread_title:  Why does the rubber erases the pencil? 

message: Someone should juxtapose a picture of a condom with that of the eraser. The subtitle, of course, would be "Rubber (American English)". I'd do it, but somehow it seems like I should first check to see if anyone thinks it to be too crude.
:I'd like to see a mention, disamb or otherwise (at the top?) about condoms on here... Because if you were an ignorant HS student from a religiously intolerent state opposed to family planning (heh) you might've only heard the euphemism, and thus would be unable to find the information you were looking for.
:I think a picture might be going over the top, however :)
:~ender 2006-10-15 19:42:PM MST
192.119.154.251 (talk) 18:09, 14 April 2021 (UTC)
thread_title:  Illustration 

message: I'm certainly no expert on this, but isn't an emulsion a liquid suspended in a liquid? If referring to suspended rubber particles (as the entry does), surely colloid, or merely dispersion, would be a more accurate term?
::I checked it out, and as I suspected, you are correct.  (see http://www.britannica.com/ebc/article-9369794).  I have updated the article. Verdatum 16:32, 4 October 2006 (UTC)
thread_title:  Latex is an emulsion? 

message: This article fails to explain how rubber differs from latex.  On the contrary it insinuates they are one and the same.  Is there a distinction?  If not, shouldn't the two articles be merged?Verdatum 21:17, 3 October 2006 (UTC)
replies: text: Alright, I'm in the process of editing the latex article to focus on the dictionary definition of a rubber polymer suspended in an aqueous solution.  As such, latex is a raw material used to produce rubber. -Verdatum (talk) 18:15, 2 January 2008 (UTC)
thread_title:  Latex Vs. Rubber 

message: Quite an interesting article so far but lots more could be added. For example: use of rubber in civil engineering (shock absorbers for bridges etc), vehicle tyres/tires (frictional properties especially when wet), deterioration with time and exposure to sunlight (?UV). Substitutes (especially electrical insulation used to be rubber but is now PVC, PTFE etc). How is it affected by temperature? ChrisAngove 17:08, 10 November 2006 (UTC)
thread_title: Other uses/properties of rubber

message: Does anyone know exactly what happens to rubber that causes dry rot?  That info would go well in this article and/or the dry rot article. -SCEhardT 04:52, 19 November 2006 (UTC)
thread_title:  Dry rot 

message: I fail to understand the rational behind having a separate section on "Indian Rubber Board" between the collection and chemical make up sections. Is it Vandalism? I am sure Malaysia and other big producers have similar authorities, shoule we talk about all of them? if we have to talk about indian rubber board should not this be part of the history section? Omar 18:47, 10 May 2007 (UTC)
thread_title:  Indian Rubber Board: why should it be here? 

message: The polyisoprene link points here, yet there is almost no discussion of synthetic polyisoprene.  We need a separate entry on polyisoprene.
And agreeing with the comments above, there is little coordination between the rubber, elastomer, and latex pages.Delmlsfan 22:53, 3 October 2007 (UTC)
replies: text: This is a good point, particularly since this article was moved from 'rubber' to 'natural rubber' but I'm not sure there is enough content to require a separate article for polyisoprene.  I'll add the content regarding polyisoprene here. -Verdatum (talk) 17:29, 17 October 2008 (UTC)

text: According to some sources, polyisoprene is natural rubber, but according to others, it's not latex. And then there's synthetic polyisoprene. I'm confused. Can someone clarify, either in this article, or in a separate?  --HelgeStenstrom (talk) 08:50, 9 October 2010 (UTC)
thread_title:  Polyisoprene 

message: Taken from http://technology.newscientist.com/article/dn13354
"Regular rubber gets its strength from the fact that long chains of polymer molecules are coupled, or "crosslinked," in three different ways: through covalent, ionic, and hydrogen bonding between molecules.
Of these three bond types, only the hydrogen bonds can be remade once a material is fractured, although normally there are not enough hydrogen bonds for the rubber to re-couple in this way."
Seems like a good explanation of the physical properties.
JD (talk) 15:00, 21 February 2008 (UTC)
thread_title:  Recent news 

message: "This change in entropy can also be explained by the fact that a tight section of chain can fold in fewer ways (W) than a loose section of chain, at a given temperature (nb. entropy is defined as S=k*ln(W))"
This is the correct explanation not the stuff about conversion of the kinetic energy of the chains into heat energy which doesn't make sense as they're the same thing.
Additionally this section would possibly be better placed in elastomers as it applies to all elastomers not just rubber. 137.205.78.240 (talk) 11:45, 21 April 2008 (UTC)
thread_title:  Elasticity section 

message: The introduction references the "entropy model of rubber", but never explains what it is. Fuzzform (talk) 07:29, 29 January 2009 (UTC)
thread_title:  "entropy model of rubber" 

message: Why does Caucho redirect here?  The word does not appear in the article.  Mathiastck (talk) 22:12, 20 November 2009 (UTC)
thread_title:  Caucho 

message: The term 'rubber woman' is related to this topic - maybe it deserves some coverage? (there's some disambiguation as well - e.g.: 'contortionist' and 'prosthetic woman') Actually is there any record of a model of a woman actually made from rubber (sort-of like a rubber water bag in shape of a woman - actually to be filled with water)?
—Preceding unsigned comment added by 93.86.77.55 (talk) 16:27, 12 January 2010 (UTC)
replies: text: I've never heard the term "rubber woman" used.  It doesn't sound worth mentioning on an article related to the raw material. -Verdatum (talk) 16:53, 25 January 2010 (UTC)
thread_title:  Rubber woman 

message: Mayans are not pre-historical. They were not cave people.  In fact, it wasn't the Mayans who created the rubber ball game, it was the Olmecs, a much older civilization in Mesoamerica. —Preceding unsigned comment added by 24.44.93.16 (talk) 07:21, 25 January 2010 (UTC)
replies: text: Prehistoric means "prior to a system of writing".  The fact uses the date of 1200 BC.  The oldest dated evidence of Mayan writing is 400 BC.  So yes, 1200 BC would be prehistoric.  That being said, the fact is unsourced, and certainly questionable.  If you have a source for the fact about the Olmec rubber ball game, then I'm totally in favor of replacing it.  So where did you learn this? -Verdatum (talk) 17:05, 25 January 2010 (UTC)
thread_title:  Pr-historical uses 

message: I just deleted the text:
:The para rubber tree initially grew in South America, and the first European to return to Portugal from Brazil with samples of water-repellent rubberized cloth so shocked people that he was brought to court on the charge of witchcraft.
This seemed extremely improbable for several reasons, so I added a citation request in August 2009. After 8 months no evidence has been found to support it. Additionally, reading a different site  suggests that the first person to introduce rubber to the Iberian Peninsula was Christopher Columbus, who was certainly not charged with witchcraft.
Having done that, reading of the azom.com history section suggests that our article is very incomplete on the history of rubber. "Discovery of commercial potential" sort of serves as a history section, but we do not mention the early Spanish-Mexican fabric waterproofing industry, development of rubber solvents and macintosh fabric, vulcanization, inflatable boats, the Stevenson Plan ... hardly anything actually. 
I will try to add a bit when I get time, but I don't get much free time these days so I also encourage others to seek our referenced sources on the history of rubber! -- 202.63.39.58 (talk) 23:15, 13 March 2010 (UTC)
thread_title:  Lack of a history section 

message: Please stop direct this page to zh:橡膠. Natural rubber should direct to zh:天然橡膠. Thx, --RayYung (talk) 03:03, 16 June 2010 (UTC)
replies: text: Correction: How do I stop bots from changing the wrong Interlanguage links? --RayYung (talk) 03:57, 16 June 2010 (UTC)
thread_title:  ZH redirect 

message: User:Sanoopj seems to be attempting some sort of vandalism from India.  — Preceding unsigned comment added by 86.143.233.112 (talk) 12:02, 31 August 2012 (UTC)
thread_title:  Sanoopj 

message: Will this article eventually be edited to explain the etymology of the word "caoutchouc"? Jarble (talk) 00:48, 27 February 2013 (UTC)
thread_title: Etymology of "caoutchouc"

message: The article states "is usual to tap a pannel at least twice, sometimes three times, during the tree's life" but the article gives no clue what a pannel is or what this means.  I am unable to find any explanation of this on the web either, and the article doesn't seem to offer much context.  — Preceding unsigned comment added by 75.151.101.218 (talk) 08:03, 11 March 2013 (UTC)
thread_title:  'pannel' ? 

message: This section only discusses cultivation of Hevea brasiliensis, however rubber plantations composed of nothing but Parthenium argentatum or Taraxacum kok-saghyz also exist.http://www.gizmag.com/bridgestone-russian-dandelion-tire-rubber/23034/ These are btw noted as being much more environmentally friendly as they can be grown in locations where little else grows (ie steppes) rather than in rainforests. 
Mention in article.
81.247.175.111 (talk) 11:28, 13 April 2013 (UTC)
thread_title: Cultivation

message: The link for leaf blight led to the wrong pathogen--Phomopsis obscurans of strawberry.  The South American leaf blight of rubber is Microcyclus ulei.  (leaf blight is a general term for a type of symptom--many pathogens have such unhelpful common names).  There is no Microcyclus ulei page yet, and I'm not up to creating one, so I removed the link.  Lreuber (talk) 22:50, 22 May 2013 (UTC)
thread_title:  Leaf blight 

message: While trying to verify the claims that guayule is 'hypoallergenic', what I actually found was evidencehttp://www.accessdata.fda.gov/scripts/Plantox/Detail.CFM?ID=23135 that it can cause extreme allergic reactions--merely different ones from those found in natural rubber latex.  Therefore, someone who is allergic to natural latex will not be allergic (at least at first) to guayule rubber, but that's quite different from being hypoallergenic.http://www.fda.gov/forconsumers/consumerupdates/ucm048052.htm  I have modified the claims in the article accordingly.
JDowning (talk) 06:03, 22 September 2013 (UTC)
thread_title:  guayule hypoallergenicity

message: This article needs reviewing for inconsistencies, e.g.
section: Contemporary manufacturing
"Around 70 percent of the world's natural rubber is used in tires."
section: Vulcanization
"Today, all vehicle tires are made of synthetic rubbers."  — Preceding unsigned comment added by 212.159.59.5 (talk) 11:26, 14 October 2013 (UTC)
thread_title:  Inconsistencies 

message: :Feel free to state your position on the renaming proposal by beginning a new line in this section with *Support or *Oppose, then sign your comment with ~~~~. Since polling is not a substitute for discussion, please explain your reasons, taking into account Wikipedia's policy on article titles.
*Oppose - Natural rubber is a large topic space in its own right, and quite distinct from broader topics like Rubber, Elastomers, Polymers - AresLiam (talk) 23:39, 22 February 2014 (UTC)
thread_title: Survey

message: I removed the external links because none of them met the guidelines. I've copied some of them here because I think these might be used as sources in the article:
*A Brief History of Rubber
*Rubber timeline
*Historical Rubber Prices
*Database for natural rubber, by National Laboratories of Medicine
*Rubber-Chemical Compatibility Guide
*Basic Rubber Testing
Jojalozzo 13:30, 3 June 2014 (UTC)
thread_title:  Inappropriate external links 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: Is it not that rubber polymer is better for car-wheels-rubber? The chemical structure preposes for better traction on almost any surfaces.  — Preceding unsigned comment added by 112.198.75.213 (talk) 06:39, 7 June 2016 (UTC)
thread_title:  rubber polymer 

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thread_title:  External links modified 

message: That should be added to the article. The smell of the places where it is kept before processing is horrific. Anna Frodesiak (talk) 13:40, 25 July 2017 (UTC)
thread_title:  The smell 

message: In the #Malodour section, also mention the smell left on one's hands:
Rubber gloves can protect your hands from smells, substances, and temperatures, and they can also keep your skin soft and wrinkle-free. But it seems to defeat the purpose if you walk around for hours afterward smelling like a tire. 
Jidanni (talk) 12:02, 6 November 2019 (UTC)
thread_title:  Smell left on one's hands 

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thread_title:  External links modified 

message: Does anyone has more? Isaac Mak (talk) 03:30, 13 December 2017 (UTC)
thread_title:  Info 

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thread_title:  External links modified (January 2018) 

message: The Russian site Природный каучук links hither, but I can't see the Russian link here. Kdammers (talk) 10:31, 13 June 2019 (UTC)
thread_title:  Russian 

message: There are missing numbers or words in the last sentence of the 4th paragraph of the History section: "Liberia and Nigeria started production"
:Agreed. Feel free to delete this part or fix it. BernardoSulzbach (talk) 00:36, 15 September 2019 (UTC)
thread_title:  Missing numbers or words 

message: Prior to the late 1950s we had elastic in apparel waistbands.   Was this pure latex?   Or latex treated in some way, or combined with other fibers?  
What is used in waistbands today?   Latex?   Spandex?  FreeFlow99 (talk) 12:44, 15 April 2020 (UTC)
thread_title:  waistband elastic (knicker elastic) 

message: How is the history section intended to be organized? In particular, the "pre-World War II" section makes little sense when everything before it is also prior to WWII. Should that be "historic use of rubber"? Ed [talk] [majestic titan] 01:43, 24 September 2020 (UTC)
thread_title:  History section 

message: I had assumed that natural rubber would be very sustainable because the trees live a long time and keep producing, and they are... well, trees! But it seems there are issues of deforestation and mono-cropping as with palm oil. https://www.mightyearth.org/2021/01/26/the-unfashionable-truth-about-unsustainable-latex-rubber/ I had always thought it was like cork, which is very sustainable, but apparently it's not the same. Anyone who is an expert, I would really value a section on this.Annafjmorris (talk) 22:13, 11 November 2021 (UTC)
thread_title:  environment and climate impact