Paint and surface coating air permeability demonstration and testing apparatus

  • US 6,196,055 B1
  • Filed: 02/16/1999
  • Issued: 03/06/2001
  • Est. Priority Date: 02/16/1999
  • Status: Expired due to Term
First Claim
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1. A gas permeability demonstration or testing apparatus comprisinga test block including:

  • a substrate material that is permeable to a liquid;

    a first coating material coated on at least a portion of the substrate material, wherein the coating material is substantially impermeable to liquid, but is relatively permeable to a gas;

    a pressurized gas source in communication with the test block;

    a liquid vessel in communication with the test block, but nor with the pressurized gas source;

    whereby a pressure gradient is created between the pressurized gas source and the liquid vessel across the test block.

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