Talk:High-density polyethylene

Hi. Quite a lot of information is missing and should be added: chemical/mechanical/physical properties, structure, formation processing etc. Kushnir11 (talk) 09:06, 24 January 2018 (UTC)


 * mecanical??? On a vest? 2601:646:4100:7E60:1DC4:F848:FE08:29A (talk) 00:29, 28 September 2023 (UTC)

made from Petroleum
HDPE is made from ethylene but not directly from petroleum. Petroleum is cracked into ethylene among others. One should at least state the intermediate step of ethylene.... someone should definitely redo the introducing paragraph. lg Phil --90.136.120.112 (talk) 21:37, 14 January 2013 (UTC)

Structural formula
WHaT IS THE STRUCTURAL FORMULA FOR HDPE/LDPE/LLDPE
 * [CH2]n. Please don't yell, it's not polite.

Tg
If anyone ever adds the glass transition temperature, please also add that piece of information to positive temperature coefficient. Thanks, Joel

I just stumbled upon HDPE when I was doing some research into an anti-dumping case, I noticed that the article did not have a melting point so I put one in, but i'm not sure whether it relates to the above comment thanks librarianofages.

What is the density of HDPE?

Actual density.
The article is about High-density polyethylene, but the actual density of the material in never quoted. The Polyethylene article quotes $$0.941 g \times cm^{-3}$$ but without references. Godot (talk) 19:41, 29 June 2008 (UTC)

Normal loss in the chemcial process of producing Poly Ethylene
Dear all, i m not a chemist but interested to know for my knowledge that when Polyethylene and Ethylene Glycol is produced, is there any normal loss i.e. if 100 input of catalyst and Ethane etc is inputted, do we get 100% of the output or is there any loss due to chemical reaction. I cannot find this in the description.

please email me the reply on moid.raza@yahoo.com

Thanks for the information —Preceding unsigned comment added by 62.150.68.5 (talk) 10:30, 18 September 2008 (UTC)

Any way to solvent Weld/glue?
There must be some chemical solvent that can join it. —Preceding unsigned comment added by Ericg33 (talk • contribs) 01:42, 6 July 2009 (UTC)


 * See polyethylene. Wizard191 (talk) 15:03, 6 July 2009 (UTC)

Water storage
I have heard that it is unsafe to store water long term in HDPE containers and that glass or PETE is preferred. I think it had to do with plastic mixing with the water. I have seen this also when leaving water in the car.. especially when it gets hot, the water from the HDPE jug had a definite off taste but the PETE water did not taste any differently (obviously this is original research and not useful for the article), but I wanted to put it out there in case scientific study has already been done and can be cited one way or the other. Thanks --32.97.110.61 (talk) 00:17, 7 July 2010 (UTC)


 * Your jug may contain plasticizers that are leaching into the water, rather than the HDPE resin itself. I would guess that HDPE is a lot safer for health because polyethylene is just a simple, linear, aliphatic hydrocarbon, wheras PET contains reactive groups as well as benzene rings. PET could conceivably break down into carcinogenic materials.  In any case, if you are concerned about leaching, avoid containers whose plastic is softened by plasticizers.  —Preceding unsigned comment added by 24.85.143.66 (talk) 14:08, 21 July 2010 (UTC)


 * Aha, found a paper which describes a source of bad taste in HDPE containers: http://jds.fass.org/cgi/reprint/74/1/96.pdf . According to this, "[a]pparently this “plastic” off-taste is due to low molecular weight oxygenated species formed through oxidation or ozonation of the HDPE, which migrate from the plastic into the water (V. V. Vickroy, 1988, personal communication)".


 * Also this: http://www.thefreelibrary.com/Identification+of+off-flavor+compounds+in+high-density+polyethylene+...-a020999516 —Preceding unsigned comment added by 24.85.143.66 (talk) 15:27, 21 July 2010 (UTC)

PEHD?
Never seen this order and it's incorrect English grammar. Maybe it's a French acronym? Polyetylene haute densite? —Preceding unsigned comment added by 24.85.143.66 (talk) 14:01, 21 July 2010 (UTC) Yup, PEHD is HDPE in french. —Preceding unsigned comment added by 151.183.0.36 (talk) 14:46, 4 October 2010 (UTC)

Context?
From Article:

"It takes 1.75 kilograms of petroleum (in terms of energy and raw materials) to make one kilogram of HDPE. HDPE is commonly recycled, and has the number "2" as its recycling symbol. In 2007, the global HDPE market reached a volume of more than 30 million tons"

"1.75 kilograms of petroleum (in terms of energy and raw materials) to make one kilogram of HDPE" Is this relatively a lot or a little?

"In 2007, the global HDPE market reached a volume of more than 30 million tons" Same question — Preceding unsigned comment added by 70.181.109.130 (talk) 02:06, 9 January 2012 (UTC)

File:Hdpe pipe installation.jpg to appear as POTD
Hello! This is a note to let the editors of this article know that File:Hdpe pipe installation.jpg will be appearing as picture of the day on October 26, 2014. You can view and edit the POTD blurb at Template:POTD/2014-10-26. If this article needs any attention or maintenance, it would be preferable if that could be done before its appearance on the Main Page. Thanks! — Crisco 1492 (talk) 02:03, 7 October 2014 (UTC)

Alternative names?
HDPE is sometimes called "alkathene" or "polythene" - are these worth mentioning? (Just had to go hunting to find what "alkathene" means when someone used the term). e.g: http://www.level.org.nz/water/water-supply/system-layout-and-pipework/pipe-materials/ Alkathene seems to be a reasonably common name, at least here in New Zealand. BevanFindlay (talk) 22:22, 5 March 2015 (UTC) I will add this anyway, as I think it's useful information.

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To add to article
To add to this article: does HDPE ever contain phthalates (or similar compounds), and, if so, do those phthalates (or similar compounds) leach out of the HDPE when in contact with liquids or foods? 173.88.246.138 (talk) 16:21, 22 December 2019 (UTC)

Alternatives
Hi People of the world. Just wondering if someone is going to add something about alternative materials to this page. I read about Silvergate Plastics trialling this material called "Floreon" as an alternative to HDPE.

Thanks, DCDeadstone

solvent resistance vs. gluing
"HDPE is resistant to many different solvents, so it cannot be glued." Glues do not dissolve the surfaces they are joining; solvent cements do. Therefore, I don't think HDPE "cannot be glued" *because* of its resistance to solvents. SeanMon (talk) 17:05, 28 April 2022 (UTC)

what is the life span of this plastic
and how does it respond to repeated heating and cooling (say from zero to about 100 degrees Fahrenheit?)tx 64.229.175.25 (talk) 20:50, 2 January 2023 (UTC)
 * That depends greatly on what stabilisers have been added to it. Items can last for many years before failing. No one really knows how long full degradation takes. --Project Osprey (talk) 22:12, 2 January 2023 (UTC)