Plastic Film and Gas Permeability

NONE!

Are you saying that there is no relationship of poison gas's ability to permeate plastic film?

No,

I'm saying that since there's no way of knowing to what use you might put the information, no one is going to discuss this with you.

Sorry, did not want to be seen in that manner. Let me try, again.

I am working on something called a Life Suit. It is a plastic film that separates the wearer's environment from that of its exterior. Meaning, that if one is wearing the Life Suit and there is a poison spill, leak or attack (having enough air supplied through a CBRN filter on the inside), would the plastic film (sheet) be sufficient to protect the wearer from the air borne poision (gas) touching the surface of plastic (in gas form, not liquid) for several hours - sufficient time for the first responders to arrive or the gas to dissipate on its own in the external environment.

I truly hope that is better - I am really not trying to waste your or anyone's time. Thanks.

Life Suit,

It sounds like you may be trying to "re-invent the wheel"...

There are such suits available on the market. They are typically used by hazmat workers & first responders. They aren't cheap, and are typically used in conjunction with a SCBA (self contained breathing apparatus) - You have a cylinder of compressed clean breathing air inside the fully encapsulating suit.

Unless you know exactly what airborne contaminant you are being exposed to, and at what concentration, it is not adviseable to rely on a filter to remove the contaminant(s) from the air you plan on breathing, it is far better to have a supply of known clean air to breathe. (Just like firefighters with their "scott-packs")

Do an internet search for "Level A+suit"

If you are interested in exploring this further:

There isn't one simple answer to your question. Different "plastics" exhibit differing resistance to chemical penetration.

You can deal with many types of airborne C and B agents , but the R & N are going to be more difficult. Radiation will pass through most membranes, unless they are made of Pb.

Manufacturers of chemical protection suits & chemical resistant gloves test their products with various "challenge agents", and they measure the time it takes for various chemicals to penetrate the membrane. This is called breakthrough (or permeation) testing...

So, you can get some good guidance by searching the web sites of the manufacturers of personal protective equipment (PPE) used in industry.

The "Key" words for your search would be PPE+chemical+breakthrough...

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Just my $0.02...

Thank you. I will follow you suggestions.

A bit more clarity: The Life Suit is not for people to work in or that it be for a first-responder, but rather a first-line of defense for innocent riders on a subway or in an office building, etc. For example, the terrorist attack in Japan (subway) - the victims had time to get into a Life Suit, but not enough time to get out or be saved.

Again, thank you for helping, I really appreciate it.