A composite barrier membrane coated on a substrate and membrane is formed
by phase inversion technique utilizing a water-insoluble wax and a
water-insoluble polymer dissolved in a solvent. The barrier membrane
coated upon the substrate is used to control transmembrane transport of a
liquid and a gas. The substrate can be a starch based food package
material, a protein based food package materials, a natural fabric, a
synthetic fabric, or a paper product.