The ASTM F1927 standard is a critical test method used to evaluate the oxygen gas transmission rate (OTR), permeability, and permeance of barrier materials under controlled relative humidity conditions. This method employs a coulometric detector, providing highly accurate measurements essential for industries such as food packaging, pharmaceuticals, and medical device packaging, where oxygen barrier properties are crucial for product preservation and shelf life.

Scope and Application

ASTM F1927 is specifically designed for measuring the oxygen transmission rate (OTR) of:

Testing instrument：OTR-D3 Oxygen Permeability Tester

Test Principle

The method involves:

Sample Preparation – The material is mounted in a diffusion cell, separating two chambers.

Humidity Control – One side of the material is exposed to a humidified oxygen stream, while the other side is purged with a dry carrier gas (typically nitrogen).

Oxygen Detection – The transmitted oxygen is carried to a coulometric sensor, which electrochemically reacts with the oxygen, generating a current proportional to the oxygen concentration.

Data Analysis – The OTR is calculated based on the sensor response, sample area, and thickness.

Key Parameters Measured

Oxygen Transmission Rate (OTR) – The volume of oxygen passing through a material per unit area and time (typically expressed in cm³/m²·day).

Permeability (P) – The OTR normalized for material thickness and partial pressure difference (units: cm³·mil/m²·day·atm).

Permeance (Π) – The OTR normalized for partial pressure difference (units: cm³/m²·day·atm).

ASTM F1927 is widely used in:

Food Packaging – Ensuring oxygen barrier properties extend shelf life.

Pharmaceuticals – Protecting sensitive drugs from oxidation.

Medical Packaging – Maintaining sterility in medical device packaging.

Compliance with this standard ensures that materials meet regulatory and performance requirements, such as those set by the FDA (Food and Drug Administration) and ISO (International Organization for Standardization).

Conclusion

ASTM F1927 provides a reliable and standardized approach for measuring oxygen transmission in barrier materials under controlled humidity. Its use of a coulometric detector ensures high accuracy, making it indispensable for industries requiring precise oxygen barrier assessments. By adhering to this method, manufacturers can optimize packaging materials to enhance product protection and longevity.