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A Question Of Chemistry

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catsrcool | 10:19 Thu 10th Dec 2020 | Science
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I am using model paints thinned with 2K Automotive thinners.
I need to buy some small disposable mixing cups that will not react with the solvents.
It was suggested that I buy ones made from HTPE. Here is its chemical resistance chart:
http://www.sdplastics.com/kingplastic/Chemical-Resistants-Chart.pdf
And the solvent I am using:
https://www.jawel.co.uk/jawel_pdf_data/Jawel%20-%202K%20Thinner%20(2018).pdf
So please can tell someone tell me if the HTPE will resist the solvent?
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Purely on the basis of my own experience, HDPE is fairly resistant to a range of petroleum products/solvents so I would be optimistic. The best course would be if you can find a small fragment of HDPE, put a bit of the solvent into a glass jar, drop the HDPE into it and have a look a couple of days later to see if it has softened at all.
Old glass fish paste type jars not suitable ?
Glass is fairly inert.
Question Author
Thanks.
Old_Geezer in painting session over a couple of days I can use 10-15 so glass is not really an option.
KARL I am tempted to try it. I asked the supplier if I could have a sample before buying a minimum of 1000 and they said no.
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ELECTRPCHEM Thank you that is close but the most they need to hold is 25ml.
The problem you may have is that you probably need something with a wide neck. These are 30ml bottles, but the neck is narrow, so I don't know if they will be of use. Do the containers need to have a lid?

https://ampulla.co.uk/shop/plastic/hdpe-bottles/30ml-hdpe-bottle-natural-screw-cap/
Question Author
ELECTROCHEM Thanks the ideal product would be disposable shot glasses that are resistant to the solvent.
I bought some of evilbay which are fine for acrylics thinned with distilled water for example.
But put the 2K thinners and paint in and give it a stir it immediately starts to soften the plastic and if I put it in my airbrush it will block it up.
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To clarify their "life expectancy" is 20 minutes
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ELECTROCHEM I may end up going for something like that.
If they fit in my ultrasonic cleaner then I could re-use them rather than going down the disposable route.
PTFE containers would do the job if you could source them. The major scientific supply houses would turn you away unfortunately but you might be able to find them elsewhere.
Could you not use the shot glasses and put foil inside them? Then you could bin the foil and re-use the shot glasses.
HDPE will provide some limited resistance to the solvents for a few days but you will have to replace the containers quite frequently. I wouldn't use HDPE for anything with xylene as a component.

Be very careful. Xylene is nasty stuff.
I can't quite see how foil could be used to line shot glasses so that seepage doesn't occur. The only way to do this is to have a preformed fully sealed aluminium insert of the correct capacity which would require industrial tooling. Sufficiently robust inserts would not need a surrounding container anyway.
Cut a square of foil, mould it around the outside of the glass to get a rough shape, then put it inside and push it down to fit the glass.

It would take only a few attempts to get the right size of foil.

The Corbyloon, your method would not prevent the solvent from coming into contact with the surrounding container. Hydrocarbons have a remarkable affinity to seep. You could not seal the aluminium sufficiently anymore than you could expect a foil lined plastic washing up bowl to contain water to prevent the water from coming into contact with the plastic.
A wee shot glass is easier to line with a bit foil than a washing-up bowl.

Try a tissue or a sheet of kitchen roll and push that inside a tumbler and you'll see it can be lined easily.
If you look at the wee paper containers that are used for sauce at the likes of McDonald's, they are made from a single sheet and folded to give more strength.

The foil replaces the paper and needs no strengthening as it's supported by the glass.

Question Author
Thanks for all the replies.
I have gone down the non-disposable route and ordered some of these:
https://www.ebay.co.uk/itm/Borosilicate-Glass-Beakers-Laboratory-Glassware-Beaker-Sets-Boro-3-3-Low-Form/222402414709?ssPageName=STRK%3AMEBIDX%3AIT&var=521507207247&_trksid=p2057872.m2749.l2649
I will just stick them in the ultrasonic cleaner after each use and they do have pouring lips which is a bonus.

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