標準號：ISO 2556-1974
中文標準名稱：塑料 在大氣壓力下薄膜和薄板的透氣率的測定 測壓法
英文標準名稱：Plastics; Determination of the gas transmission rate of films and thin sheets under atmospheric pressure; Manometric method
標準類型：G31
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：G31
國際標準分類號：83.080.01
適用范圍：Specification of the methodand of two types of suitable test apparatus. The plastic test specimen separates two chambers, the one contains the test gas at atmospheric pressure, the other of known initial volume has the air pumped out until the pressure is practically zero. The quantity of gas which passes through the specimen from one chamber to the other is determined as a function of time by measuring the increase in pressure occuring in the second chamber by means of a manometer.