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  How to Test Oxygen Permeability of Food Packaging According to ASTM D3985 Standard   Oxygen transmission rate is a crucial indicator for evaluating the barrier properties of packaging materials. For food packaging, excellent oxygen barrier performance is essential to ensure food safety and effectively extend shelf life. ASTM D3985, "Standard Test Method for Oxygen Gas Transmission Rate Through Plastic Film and Sheeting Using a Coulometric Sensor," is a standard test method that employs the coulometric sensor principle to measure the oxygen transmission rate of plastic films, sheeting, laminates, paper-plastic composites, plastic-coated fabrics, and similar materials. This evaluation helps determine the packaging material's ability to block oxygen, ensuring food remains unaffected by oxygen throughout its shelf life. Understanding the Coulometric Sensor Method The coulometric sensor method involves clamping the test specimen (the food packaging material) into a per...

ASTM D3985 is a standard developed by the American Society for Testing and Materials (ASTM), specifically designed for determining the oxygen transmission rate (OTR) of plastic film and sheeting. This standard outlines the test methods and procedures to ensure the accuracy and comparability of test results. For the oxygen transmission rate measurement of plastic films as specified in ASTM D3985, a specialized oxygen transmission rate test instrument plays a vital role in adhering to the standard. Taking Labthink C203H Oxygen Transmission Rate Test System as an example, it's designed and manufactured based on the coulometric oxygen analysis sensor and equal-pressure method, meeting the requirements of ASTM D3985 and other relevant standards. ASTM D3985 Plastic Film Oxygen Transmission Rate Tester: Test Principle The testing principle is based on the coulometric oxygen analysis sensor and the equal-pressure method. During the test, a pre-treated sample is clamped between two ...