Talk:Epoxy

1-part epoxy?

Could someone with some knowledge in this area explain, or at least refer to a site, how a 1-part epoxy (no separate hardener, I assume) works?

Oops, I could've *sworn* I signed this. --Joe Sewell 17:42, 21 November 2005 (UTC)

Some epoxies require a certain heating aspect in order to cure - certain temperature for certain time. In this case, you can mix the two parts together, but they won't cure until the heating has been carried out, or at least they will cure very very slowly. I would guess that this is what a the 1-part epoxy you're talking about is. -chc

Another type of 1-part epoxy is a Powder Coating type known as Fusion Bonded Epoxy (FBE coating). This, as final product, is a one component powder coating. Infact, the powder coating contains the epoxy, hardeners, fillers and extenders, but they all are blend and in a powder form at ambient temperature. Please refere to the article in Wikipedia "Fusion Bonded Epoxy Powder Coatings" for details. I have edited the section "Paint and Coatings" in the main article to incldue FBE coatings in the text.

Penguine_s, January 25, 2006

Hi all. Also, one system are water-borne epoxy coatings. The resins are kept in a suspension, similarly to say, acrylic latex, etc. When the film is applied, the water evaporates and a film forms in which the resins are able to meet and fuse. 24.85.143.66 (talk) 04:42, 31 January 2011 (UTC)

Does anyone else think the caption below the picture of epoxy curing on a surfboard fin sounds like an advertisement for the mentioned brand of epoxy?

I have seen many spray paints that are sold as "epoxy". They're usually white and advertised as a repair paint for washers/dryers/fridge/etc. They are single part spray cans. Does anyone know if there's something special about these paints that allow them to be called epoxy, or is this just marketing BS? Gcronau (talk) 15:06, 2 February 2012 (UTC)Gcronau

Epoxy Removal

I believe Epoxy is also used in electronics for security, making the electronic component under a dob of epoxy very difficult to get to and be tampered with. Can anyone else vouch for this? And, how does one remove epoxy? Or is it not possible? Matejhowell 17:39, 31 January 2006 (UTC)

In the pipe coating industry, the applied epoxy coating (rejected during QA/QC) is removed by burn-off at a temperature of 700 to 750° F for about 6 hours in an air circulating oven. Another method of removing epoxy coatings from small aras is by soaking the area in a suitable solvent such as Methyl Ethyl Ketone (MEK) or Xylene. ~~ Penguine_s February 5, 2006

For larger areas, such as in decorative collector's displays of coins or other objects embedded in clear epoxy resins, one will find MEK, Xylene and most organic solvents completely ineffective in dissolution of epoxy. <Ken Forbes April 13, 2006>

Air temperature cured epoxy can be "melted" by applying heat. Michael

Crosslinked epoxies are not soluble in any solvent, they only swell depending on the solvent used. Amine-cured epoxies may be destroyed by acetic or formic acid, pure or diluted by a suitable solvent (dichloromethane e.g.). I don't exspect vinegar to be suitable for removing epoxy mixtures, because epoxy resins are insoluble in water. It only may dissolve amine hardeners by forming a salt with the amines. On the other hand, acetone dissolves epoxy resins but often forms insoluble compounds with amines... I recommend alcohols (ethanol, isopropanol). --FK1954 (talk) 15:16, 14 January 2009 (UTC)

Anecdotal testimony has a solution of triethanolamine in CHCl3 and I think it was N-MePyrrolidone being used by military contractors during the 60's to dissolve the potting around Soviet chips for reverse engineering. Please do not do this at home -chlorinated solvents may attack metal. I believe in a pressure vessel but temperatures were not (too) extreme.71.31.152.220 (talk) 20:21, 23 August 2012 (UTC)

Epoxy Quality

Is there any way to determine the additive that causes one epoxy to harden faster than another? —The preceding unsigned comment was added by 70.184.10.240 (talk) 17:25, 13 February 2007 (UTC).

Krazy Glue

I Heard Krazy Glue Will Melth Through Epoxy. I Put Krazy Glue On My Surfboard Which Has An Epoxy Covering And It Turned White. It Is One Of The Aviso Boards That Are Made Of Carbon And It Costy Me About $1220 So I'm Pretty Worried About It —The preceding unsigned comment was added by 67.169.154.107 (talk) 23:10:00, August 18, 2007 (UTC)

Epoxy group

Isn't epoxy also the name of a chemical functional group i.e a chemical can be siad to contain and expoxy (epoxide) group, which is presumably why this compound is so named?

Souldn't this fact be incorporated into this page or a disambigious-type page created? —Preceding unsigned comment added by 80.254.147.68 (talk) 09:47, 27 September 2007 (UTC)

Yes, I think there should be a disambiguation page. One link should come to this page, which should be called Epoxy(adhesive). The other link should go to the Epoxide article. Deepfryer99 (talk) 20:13, 20 March 2008 (UTC)

I added a hatnote to the article to disambiguate the meaning of "adhesive" and the meaning of "chemical group". Do you think the name of this article should also be changed? Devil Master (talk) 15:32, 28 September 2011 (UTC)

HEY CAN SOMEONE EXPLAIN:

1. How epoxy PUTTIES are made? Does the body mostly consist of just epoxy + talcum powder mixed into each of part a and part b? can I make my own putty from a low viscosity epoxy?
2. Is epoxy the strongest material in the world? Can someone disuss the possible achievable tensile strengths, what allows for these strengths because I often see tensile strength quoted
3. Is epoxy often utilized in ICF (insulated concrete form) work for building homes to increase the strength of concrete and prevent the steel rods from corroding or is polyester used?
4. I think the section about gel coats needs clarification.

It says that polyurethane can coat over epoxy and then it says it has poor adhesion. Which is it? Also, is it possible to use oil paint on top of epoxy (ie are there adhesion issues?)

1. Can someone please add a section about how epoxy can be used in wood rot applications by applying borax first?
2. Is silane ever added to epoxy?
3. It is confusing so who owns the switzerland epoxy plant now?

Thanks. —Preceding unsigned comment added by 86.31.47.199 (talk) 07:28, 22 April 2008 (UTC)

temperature service range?

What is the typical temperature service range of the cured adhesive? -69.87.200.177 (talk) 23:38, 29 April 2008 (UTC)

Possible WP:COPYVIO

This edit appears to come from here. Some of that page is in turn declared to be from a PD source here, but the suspected material doesn't form part of the "free" page. Can anybody take this further? I'm inclined to delete, particularly as the new paragraph is widely digressive. --Old Moonraker (talk) 05:57, 9 September 2008 (UTC)

This one [1] GFDL gives more info about the sources of the text [2]. (FIXED).Mion (talk) 09:12, 9 September 2008 (UTC)

Thanks for the additional links. They are helpful, in that the original writer acknowledges that he has taken "details" from Scientific American, Encarta and works published by the OUP. For this reason, coupled with the largely off-topic content, I have trimmed heavily. --Old Moonraker (talk) 06:04, 10 September 2008 (UTC)

Chemistry

The chemistry section of this article is nothing short of shocking. I'll edit it properly to illustrate their synthesis, how the curing reactions work and the effects of changing the type of resin and the type of hardener when I have some time in the near future.

Matt —Preceding unsigned comment added by 208.226.210.206 (talk) 07:26, 20 October 2008 (UTC)

Yes, the only thing I read about curing is that a "catalyst" is used - which may be right but in the most cases isn't. --FK1954 (talk) 15:21, 14 January 2009 (UTC)

Also please tone down all the talk about businesses involved. Who cares about the money grubbing that goes on? Thanks. —Preceding unsigned comment added by 174.1.20.11 (talk) 21:34, 3 March 2009 (UTC)

What is the layman's term basic raw material for the components (resins and hardeners) of epoxy? Petroleum? Coal? bio (plant)? Wikiredr (talk) 23:32, 29 January 2010 (UTC)Wikiredr

Epoxy

How does Epoxy hold up when it comes in contact with Gasoline or Ethonal? —Preceding unsigned comment added by 64.203.237.78 (talk) 16:06, 29 January 2009 (UTC)

This depends on the composition of the resin, but usually nearly nothing will happen. --FK1954 (talk) 17:47, 29 January 2009 (UTC)

Is it thermosetting or not?

The opening sentence says epoxy is thermosetting and later in the article it says epoxy doesn't necessarily benefit from heat generated during the curing process. Is epoxy thermosetting or not? Rsduhamel (talk) 19:35, 26 June 2010 (UTC)

Thermoset doesn't mean "heat induces curing" (see that article's opening sentence--the terminology is confusing, but mere Wikipedia can't fix that:(. Luckily, the opening sentence links "thermosetting" to that article, so you can un-confuse yourself. DMacks (talk) 20:49, 26 June 2010 (UTC)

differant between adduct cured epoxy and cured epoxy

i need to know the differant between adduct cured epoxy and cured epoxy —Preceding unsigned comment added by 121.241.230.131 (talk) 10:50, 21 July 2010 (UTC)

Economics and addition

The Economic section starts out stating that Epoxy is a $15bn/year market. Later in the article, it is stated that due to the economic recession, epoxy has dropped to $15.8 bn/year. (Wish the recession treated me like that!) What was the actual peak yearly market of epoxy between 2005 and present?

The "Wind Power" section covers the process that is also used for making aircraft propeller blades and wings, R/C aircraft wings, and similar airfoils, should this be mentioned in the "Wind Power" section, or should they be mentioned, and the title changed to "Airfoil usage"?

8r455 (talk) 05:03, 16 May 2011 (UTC)

I removed the wind power section because it's not an example of an epoxy, but rather of a fibre-reinforced plastic. Wizard191 (talk) 19:32, 17 May 2011 (UTC)

Solubility

In which solutions does epoxy resins dissolves? —Preceding unsigned comment added by 59.182.141.157 (talk) 07:03, 20 July 2011 (UTC)

Toxicology

According to the German Wikipedia, epoxy is highly toxic and carcinogenic upon skin contact, and a number of industrial institutions are named which therefore issue health regulations regarding it, which is that no material for daily use must be made of more than 0.0002% epoxy. Also it recommends handling epoxy only by means of proper protection, that is full-body protective suits, like hazmat suits, and that simple rubber gloves are not save to handle a substance as hazardous as epoxy.

While here on the English version of the article, epoxy is made out to be just like any other glue. Might this have something to do with the fact that "60% of the Dollar value is dependent on the epoxy industry"? --79.193.56.119 (talk) 02:54, 30 July 2011 (UTC)

"There are no reports of carcinogenic, mutagenic, teratogenic or reproductive effects to humans..." but you are right about rubber gloves: "PVC gloves, good housekeeping, hand washing before breaks are needed." This is a bit of a simplification as the manufacturing process, rather than the deployment, uses some nasty stuff. 60% of the cost of the product goes to these bulk manufacturers, but why would this introduce any overly favorable editing on the English Wikipedia? Quotes are from Chemical Hazards of the Workplace ISBN 9780471268833, pp 298–301. --Old Moonraker (talk) 08:45, 30 July 2011 (UTC)

Afterthought: I've just looked at the German article, for an explanation of "no material for daily use must be made of more than 0.0002% epoxy". What it actually says (or, rather, what the google translate rendition actually says) is that any unconsumed residual of a component, epichlorohydrin, should be less than 0.002% (not 0.0002%). "Under certain circumstances a protective suit may be necessary" (emphasis added). Any help? --Old Moonraker (talk) 09:16, 30 July 2011 (UTC)

Speed of Sound

Hi, does anyone know any values or sources for the speed of sound or impedance of epoxy?--141.63.34.53 (talk) 14:41, 21 October 2011 (UTC)

Paints and Coatings

The first paragraph of this section reads as if it was lifted from the marketing brochure of a particular product. The facts might be right for that one particular product, but they are wrong for the category as a whole. Epoxy paints are mixed in any number of different ratios, depending on the product, not just 4:1. 2:1 is much more common. They also often have a high volitile content, and most *don't* clean up in just water. This paragraph should probably be removed and replaced with something that better describes the category. Gcronau (talk) 15:22, 2 February 2012 (UTC)gcronau

epoxy breakdown

Flapityjack (talk) 09:22, 14 May 2012 (UTC)Hello, I appeal to anyone knows about it: I have more interest in how epoxy can be broken down. There are some suggestions that extreme heat, alcohol or some very toxic chemicals may be of use, but several times it is mentioned that epoxy is subject to deterioration by UV light, so I would surmise this could be a way (though I wonder how long it would take)? I am interested in regards to world wide pollution by plastics. Is epoxy one of the things that's ending up in the Great Pacific Gyre (Great Pacific Rubbish Patch), starving birds bellies etc? If so, how to break it down safely is obviously a very important issue. Please address! Thank you.Flapityjack (talk) 09:22, 14 May 2012 (UTC)

Epoxies are highly cross linked and unreactive. UV deterioration is slow. Your interest in the environment is laudable. But action without knowledge is a recipe for disaster. You surely can't believe that only good intentions are necessary to fix the world?!? Spending energy tilting at windmills is at best ignorant. It is not up to us to research your concerns. If you want to know the composition of the GPG, there have been numerous articles written. Go. Read. them. Epoxies can best be broken down by burning, because of the high temperatures necessary for the aromatic rings (this is all over your head, isn't it?), it may be most effective just to bury them. That way their carbon is sequestered, probably for a very long time.71.31.152.220 (talk) 20:04, 23 August 2012 (UTC)

Not a Forum... and article is deeply flawed

Scanning through most of the comments here, I find them well below the threshhold of competence and knowledge that should be expected from contributors. Please do NOT add to this page if you can not substantively contribute, and most can not. If there is a topic which you feel is missing or incomplete, then by all means, but this is not a epoxy technical data page nor a political forum. If your question is about a specific product you bought, consult the manufacturer. If you do not understand that almost all of the answers to questions on the properties of epoxies will depend on the formulation and can not be answered here, then you shouldn't be posting here at all, IMHO. . This article is fundamentally wrong. First of all, epoxy based polymers are mostly adhesives, but are also used for other purposes such as coatings, composite (resins) and sealants (many more examples are possible). Second: epoxies can react with themselves or with anhydrides, acids, amines, amides, and mercaptans to name the most common co-reactants. It is absolutely WRONG to claim that epoxy adhesives are epoxy + amine. All of the above mentioned co-reactants are COMMONLY used. If I get a chance I will begin to make this more general and accurate.71.31.152.220 (talk) 19:52, 23 August 2012 (UTC)