Precision OTR Testing: Meeting ASTM D3985 for Plastic Films and Sheeting

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 test chambers. Oxygen flows on one side of the film, while high-purity nitrogen flows on the other side. Oxygen molecules diffuse through the film into the flowing high-purity nitrogen and are carried by the nitrogen to the sensor. The sensor measures the oxygen concentration, which is then used to calculate the oxygen transmission rate.



ASTM D3985 Plastic Film Oxygen Transmission Rate Tester: Instrument Features and Application Scope

  • High Precision: Utilizes a ppb-level coulometric oxygen sensor, allowing for a lower testing limit.
  • Automated Control: Achieves automatic control of flow, temperature, and relative humidity, enhancing testing precision and repeatability.
  • Multiple Test Chambers: Equipped with three independent test chambers, supporting simultaneous testing of three samples under the same conditions.
  • Safe and Stable: Operated via a Windows-based touch tablet, featuring over-limit alarm and automatic protection functions.
  • Application Scope: Plastic films: Such as PE, PP, PET, etc. High barrier materials: Such as EVOH, PVDC, etc. Other film and sheet materials: Such as paper-plastic composite films, co-extruded films, metallized films, etc.

In conclusion, the oxygen transmission rate test instrument plays a crucial role in measuring the oxygen transmission rate of plastic films conforming to the ASTM D3985 standard. By effectively utilizing this instrument, the oxygen transmission rate of plastic films can be accurately measured, providing strong data support for evaluating their barrier properties. Labthink looks forward to increasing technical exchange and cooperation with enterprises and institutions across various industries.

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