Here's a picture taken from Kiwicamping website showing some typical vessels for the gases mentioned. Note the LPG and the 100% Propane are in heavy duty steel vessels.
Here's a video showing how camping style canisters are manufactured and tested. Note how they are tested in 52C water. Take a look on a canister some time it will state do not use them above 50C for Isobutane. https://www.youtube.com/watch?v=81lwc0L8Tfw
And finally a report of someone being injured by using a windshield around a gas cooker ( Can only assume it was regular Iso/Butane mix gas). The likelyhood of this happening is greatly increased with a higher percentage of Propane. Don't let it be you, your family or friends for the sake of saving a minimal amount of money.
https://worksafe.govt.nz/topic-and-i...burn-injuries/
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