ASTM D3985 Determination of Oxygen Gas Transmission Rate (OTR) through Plastic Film and Sheeting

Get Certified ASTM D3985 Testing for Reliable Oxygen Barrier Performance

Plastic films and sheets used for packaging need suitable resistance to oxygen transmission. Thus, oxygen transmission testing is performed to assess the barrier performance and to compare the different plastic materials. Controlled testing to measure oxygen transmission is available as per ASTM D3985. The results help select materials, develop products, ensure quality control, and evaluate packaging performance.

• Determines the oxygen gas transmission rate (OTR).
• Assesses oxygen barrier properties.
• Measures oxygen permeance.
• Helps to measure oxygen permeability for relevant materials.
• Use for plastic films and sheeting.
• Supports the evaluation of laminates and coextrusions.
• Assists with comparing oxygen barrier properties.
• Assists with quality control of packaging materials.

What are the Uses of ASTM D3985 Testing?

ASTM D3985 testing helps laboratories evaluate the ability of plastic materials to resist oxygen transmission. Engineers then use the results to compare packaging materials and determine if they are adequate for oxygen-sensitive applications. This standard-

• Measures the oxygen transmission rate.
• Assesses oxygen barrier properties.
• Assists in comparing plastic packaging films.
• Supports material selection.
• Helps evaluate laminate and coextruded structures.
• Helps to manage packaging QA.
• Supplies information for material development.

Which materials can be tested under ASTM D3985?

ASTM D3985 is for plastic film and sheeting products, such as laminates, coextrusions, and plastic-coated papers or fabrics. Oxygen permeability of homogeneous materials can be determined in laboratories where applicable. The material structure, thickness, surface condition, and desired test conditions should be known by the technicians prior to specimen preparation.

Why is ASTM D3985 Important?

ASTM D3985 is a standard test for measuring the oxygen transmission rate of plastic. Regular measurements enable manufacturers to gain an understanding of the barrier performance of films and sheets. The results also enable material comparisons and the selection of appropriate packaging structures when oxygen resistance is a critical factor.

ASTM D3985 Testing Process and Data Collection

Analysts select representative plastic samples and specify the test conditions. Afterward, the specimens are prepared and conditioned prior to being securely mounted in the test cell. The operator then exposes one side of the specimen to oxygen, and the other side to the coulometric sensor. The system measures the oxygen passing through the material as steady-state conditions are established. Finally, the collected measurements are used to calculate the oxygen transmission rate. Laboratories can also measure oxygen permeance and, if applicable, oxygen permeability.

Common Challenges and Troubleshooting

Accurate ASTM D3985 results require properly sealed specimens, controlled test conditions, and stable sensor operation. Leaks in the specimen may occur, and the measured transmission rate may be influenced by oxygen passing through the leaks. It is important for the technician to check for any signs of damage and confirm that the seal of the test cell is intact prior to testing. Laboratories also need reliable results when proper conditioning, stable temperatures, and gas conditions are met.

• The results are oxygen transmission and related permeabilities produced by ASTM D3985.
• OTR can be reported in cm³(STP)/(m²·day).
• OTR may also be given in units of mol/m²·s.
• The oxygen permeance can be described in mol/(m²·s·Pa).
• Oxygen permeability can be reported in mol/(m·s·Pa).
• Lower OTRs are normally associated with higher resistance to oxygen transmission.
• Laboratories can achieve consistent results when they prepare specimens similarly and control test conditions.

Link to ASTM D3985