Evverything you said should be true. I have been retired for11 years now. What you said is true the published charts show a penetration rating for different types of solvents and different glove types. The various solvents have different penetration. Also penetration VS time. I worked for a big chemical company they were very serious about protection. We used to have a choice between latex and nitrile gloves. They ended up banning latex from the premises becuse guys were using them when they should have used Nitril. Been 12 years since I saw the chart. Gloves are also rated for minimal contact and something like continual contact for various solvents.. If we buy our gloves at a local store I would think Nitrile would be the only choice. Hexane was my favorite solvent for washing oils off of parts before chemical analysis of deposits.That’s an over generalization that isn’t true. There are comparability charts that everyone should review to chose the right glove for the process. For example, latex is good for acetone. Nitrile is not. Latex is good for isopropanol but nitrile is rated only for limited exposure. Nitrile is good for mineral spirits and latex is not.
More importantly, cheap gloves have holes. If you’re serious about protecting yourself, buy rated gloves.
I don't think this is off topic since all of us are using chemicals in our sport.
A decent chart: Some publish time to change glove data. They make gloves with different thicknesses and time to penetration.

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