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How to Test Oxygen Permeability of Food Packaging According to ASTM D3985 Standard
1 /3Pages

How to Test Oxygen Permeability of Food Packaging According to ASTM D3985 Standard

How to Test Oxygen Permeability of Food Packaging According to ASTM D3985 Standard
1 /3Pages

Catalog excerpts

How to Test Oxygen Permeability of Food Packaging According to ASTM D3985 Standard-1

How to Test Oxygen Permeability of Food Packaging 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 permeation cell within the testing instrument, creating a sealed barrier. Oxygen is introduced to one side of the specimen, while a stream of nitrogen acts as a carrier gas on the other side. As oxygen permeates through the specimen, it is carried by the nitrogen into a coulometric sensor, where an electrochemical reaction occurs, generating an electrical signal. This signal is directly proportional to the amount of oxygen passing through the material per unit of time, allowing for the precise calculation of the oxygen transmission rate.

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How to Test Oxygen Permeability of Food Packaging According to ASTM D3985 Standard-2

For accurate oxygen transmission rate testing following ASTM D3985, instruments like Labthink's C203H and C206H Oxygen Transmission Rate Test Systems are recommended. Alternatively, for integrated testing capabilities of water vapor transmission rate, the C403H and C406H Oxygen/Water Vapor Transmission Rate Test Systems (which combine oxygen and water vapor permeability testing) are also suitable. • Sample Quality: Ensure the samples are representative, have uniform thickness, and are free from defects such as wrinkles, folds, or pinholes. Cut the samples to a size compatible with the testing...

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How to Test Oxygen Permeability of Food Packaging According to ASTM D3985 Standard-3

Labrhink C406H Oxygen /Water Vapor Transmission Rate Test System Testing Procedure 1. Purging the Permeation Cell: Open the nitrogen carrier gas valve and purge the permeation cell with nitrogen at a flow rate of 50 mL/min to 60 mL/min for 3 to 4 minutes to remove any residual air. Afterward, reduce the flow rate to 5 mL/min to 15 mL/min and maintain it for 30 minutes. 2. Zero Voltage Calibration: After purging with nitrogen for 30 minutes, switch the valve to the coulometric sensor position. Record a stable, low voltage reading as the zero voltage baseline. 3. Oxygen Introduction: Close the...

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