Patent ID: 6688160
Filing Date: 2004-02-10
Classification: G01N

Abstract:
A method for measuring barrier properties of a material comprising the steps of:a) positioning a sample of the material in a holding means comprising a chamber wherein the material divides the chamber into a first portion and a second portion; b) providing micrometer-sized particles; c) generating a gas for mixing with the particles; d) mixing the gas and the particles; e) introducing the mixture of the particles and the gas into the first portion and wherein some percentage of the particles pass through the sample from the first portion to the second portion; f) extracting from the first portion a small amount of the mixture that does not pass through the sample, g) counting the aerosol particles from f) in a particle counter, h) introducing a second gas through a predetermined-sized orifice into the second portion to sweep up particles that have passed through the sample; i) extracting from the second portion the mixture that passed through the sample, j) counting the aerosol particles from i) in the particle counter, k) comparing the number of particles from g) to the number of particles from j).