A Question Of Chemistry

[catsrcool]

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?

[KARL]

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_Geezer]

Old glass fish paste type jars not suitable ?
Glass is fairly inert.

[catsrcool]

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.

[Electrochem]

https://www.ibottles.co.uk/wide-neck-natural-hdpe-jar.html

[catsrcool]

ELECTRPCHEM Thank you that is close but the most they need to hold is 25ml.

[Electrochem]

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/

[catsrcool]

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.

[Electrochem]

https://www.wilko.com/wilko-shot-glasses-6-pack/p/0316142?gclid=CjwKCAiAq8f-BRBtEiwAGr3DgW9ly23r96CLXwRl6p1zobc9Q9RcSlVpYLJiyRUdY2_zdolyBYPURBoC6LYQAvD_BwE&gclsrc=aw.ds

These don't have lids of course, but are cheap enough

[catsrcool]

To clarify their "life expectancy" is 20 minutes

[catsrcool]

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.

[theprof]

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.

[THECORBYLOON]

Could you not use the shot glasses and put foil inside them? Then you could bin the foil and re-use the shot glasses.

[theprof]

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.

[theprof]

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.

[THECORBYLOON]

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.

[theprof]

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.

[THECORBYLOON]

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.

[THECORBYLOON]

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.

[catsrcool]

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.

[murraymints]

https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=petri+dish&_sacat=0


petri dish seems the obvious answer