ASTM D1434 - Standard Test Method for Determining Gas Permeability of Plastic Film and Sheeting

ASTM D1434

Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting

This test method utilizes a manometric method to determine the steady-state rate of gas transmission through plastics in the form of film, sheeting, laminates, and plastic-coated papers or fabr This test method provides for the determination of (1) gas transmission rate (GTR), (2) permeance, and, in the case of homogeneous materials, (3) permeability.

What is ASTM D1434?

ASTM D1434 is a standard test method developed by ASTM International to determine the gas permeability of plastic film and sheeting materials. This test is essential for evaluating how much gas can pass through a plastic film, which is critical for applications like food packaging, medical devices, and industrial products where barrier properties are key. The standard measures the rate at which a specific gas (such as oxygen, carbon dioxide, or nitrogen) permeates through a plastic material over time under controlled conditions of temperature and pressure. The results are useful for manufacturers to ensure that their products meet required performance specifications, especially in industries where gas transmission rates directly impact product quality and shelf life.

Determining Gas Permeability of Plastic Film and Sheeting

The permeability of plastic films to gases is a crucial factor in packaging applications. ASTM D1434 provides a detailed procedure for testing this property. The test typically involves exposing one side of the film to a gas at a known pressure, while maintaining a lower pressure or vacuum on the opposite side. The gas that permeates through the material is then collected and measured to determine the transmission rate.

There are two main methods used in ASTM D1434:

• Manometric Method: This method involves measuring the pressure change of the gas over time, which indicates how much gas has permeated through the material. It’s a sensitive approach suitable for films with low permeability.
• Volumetric Method: This method directly measures the volume of gas passing through the film over time. It is commonly used for materials with higher permeability rates.