Permeation is one of the indexes indicates the barrier properties in material field. Through the evaluation of water vapor transmission rate (WVTR) testing, oxygen transmission rate (OTR) and other gas transmission rate (GTR) testing of packaging materials, the basic guarantee for product quality and shelf-life period is confirmed.

This article introduces four methods to improve barrier property of PET bottle and PET bottle preform, as well as introduces relevant innovative testing instruments.