ASTM D4991

Test Materials:
ASTM D4991 specifies that the primary test materials include the packaging structures to be evaluated, which may consist of plastic, glass, or metal containers. These materials should be selected to represent the production lot and should be free of visible defects to ensure accurate results.

Test Process:
The test process involves placing the selected packaging materials in a vacuum chamber. The chamber is evacuated to a specified pressure, and the time taken for the pressure to rise is monitored. This indicates whether a leak is present based on the rate of vacuum decay, adhering to the standards detailed in ASTM D4991.

Test Result Interpretation:
Results are interpreted by analyzing the vacuum decay rate. A slower rate indicates a tight seal, while a rapid increase in pressure suggests the presence of leaks. The test results should be compared against predetermined acceptance criteria, ensuring that the packaging meets the required quality standards.