Oxygen Transmission Rate Test

ASTM D3985 Standard Test Method for Oxygen Gas Transmission Rate through Plastic Film and Sheeting Using a Coulometric Sensor. This test method covers a procedure for determination of the steady-state rate of transmission of oxygen gas through plastics in the form of film, sheeting, laminates, coextrusions, or plastic-coated papers or fabrics.

Test Principle

The instrument design and the way we operate the instrument are consistent with the ASTM D 3985 standard.

Dry nitrogen gas is swept through a chamber, where the test film acts as the membrane separating this stream from an oxygen stream on the other side. The partial pressure difference creates a driving force for oxygen molecules to diffuse through the film to the low-pressure side. The film barrier determines the rate of oxygen permeation, which is continuously measured by coulometric sensor in the outgoing stream of the nitrogen side. The test is complete when equilibrium, or steady state, is achieved; that is, when the sensor detects a constant amount of oxygen in the nitrogen carrier stream. The rate of oxygen permeating through the sample is not changing. This rate is the sample OTR and is recorded in units of cc/100 in2/24 hr or cc/m2/24 hr at 73°F (23°C), 0% RH.

Specification

Features

Accurate and reliable data

◆ With The State Certificate for Gradation of the certified Reference Materials and Licence for Manufacturing Measuring Instruments of the state Reference Materials（GBW(E)130497/8）of Oxygen permeability analyzer approved and issued by General Administration of Quality Supervision, Inspection and Quarantine of the P.R.C. Adopting state reference materials to calibrate and verify the instruments, ensure the accuracy, universality and authority of the test data.

Simple operation

◆ LCD and windows instrument interface show testing data and working status in real time; mouse operation is simple and convenient.

◆ Professional software with simple interface, easy to use and convenient to set test process.

◆ Fully-auto operation, judge and stop automatically.

◆ Real time curves display of transmission, oxygen concentration, temperature and humidity, curves can be easily zoomed and moved. The curves with conceal function, support query function for background data.

◆ Professional test report; can be exported as PDF.

Advanced technology

◆ Temperature control: International advanced electromagnetic technology, program controlled, auto heating and cooling; and no need of external accessories. Precision: 0.1℃.

◆ Humidity control: Dual gas flow method(dry gas and humid gas), with broad range, high precision (1%RH) and stable flow.

◆ Carrying cutting-edge ARM controlling system, can run independently without computer.

High efficiency

◆ Measurement precise up to 0.001 cm³/（m²·24h）, can test high barrier materials, such as aluminum foil.

◆ By adding package-testing accessories, can test oxygen transmission of various containers such as bag, bottle, can and bowl.

◆ By adding adaptive accessory, can expand upper limit of test range to 260000 cm³/m²•24h.

Calibration & Certification

◆ The instrument supports two methods of reference materials and standard gas to certificate and calibrate; Operation is simple, user only need use certified reference materials for normal testing, and then input the test result into the instrument interface to complete calibration.

Reliable and easy to maintain

◆ Imported oxygen sensor, with high precise and good performance, can work for a long time.

◆ Sensor over-range auto protection.

◆ Function modularization, easy to maintain.

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