Is Ripstop Nylon Suitable for Gas-Proof Balloon Envelopes?

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GTeclips
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Hello all!

I am looking to begin working on some balloon testing. I have a general idea of how I'm going to perform this. For the balloon envelope, I wish to use ripstop nylon, but I have no clue what would be the best way to make it gas-proof? I have considered coating it with both liquid latex and polyurethane, but I don't want to make a mistake.

Do any of you have a suggestion how to do this?

Thank you, GTeclips
 
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Latex is known to leak a lot, don't use it.

PU is at least mechanically strong.
 
Thank you Enthalpy, I will tell you how poly works for me.
 
why use isn't ripstop nylon have sufficient gas permeability resistance?