PACKAGE INTEGRITY TEST EQUIPMENT

Package testing involves evaluating different parameters of integrity to guarantee that the packaging effectively protects the contents and meets regulatory standards. Three essential focuses – leak testing, creep testing, and burst testing – are used to assess the performance and reliability of packaging materials.

FAQs ABOUT PACKAGE INTEGRITY AND LEAK TESTING

What is package integrity testing used for?

Package integrity testing assesses whether a package contains unintended leak pathways, such as holes, cracks, or channels through a seal. It supports packaging development, sealing-process evaluation, troubleshooting, and routine quality control. The selected test must suit the package and the defects of concern. A passing result demonstrates performance within the validated method’s detection capability. It does not guarantee that every possible defect is absent.

What is the difference between seal strength testing and package integrity testing?

Seal strength testing measures the force required to separate a specimen containing a seal. Package integrity testing investigates unintended leakage through the package or its seals. A strong seal does not necessarily mean that the complete package is leak-tight. Where both mechanical seal performance and leak resistance matter, use complementary tests rather than treating one result as proof of the other.

How do I choose the right package leak test method?

Start with the package material, format, contents, and available headspace. Then define the defects you need to detect, the required sensitivity, and whether testing may damage the sample. Throughput, fixtures, and reporting requirements also influence selection. Confirm suitability using representative packs and known leak references before establishing a routine procedure. A method suitable for one product–package combination may not transfer directly to another.

What is the difference between bubble leak, pressure decay, and vacuum decay testing?

Bubble leak testing identifies escaping gas as visible bubbles while a pressure difference is applied to an immersed package. Pressure decay testing monitors pressure loss from an internally pressurised package. Vacuum decay testing monitors a pressure rise in an evacuated chamber containing the pack. The methods differ in sample preparation, interpretation, and detection capability; select according to the package and required test sensitivity.

Can package integrity testing be performed without damaging the pack?

Yes, suitable non-destructive methods are available, including vacuum decay for compatible packages. However, non-destructive testing is not appropriate for every format or application. Methods requiring entry into the package, such as pressure decay under ASTM F2095, are destructive. Confirm that the complete procedure (including pressure exposure, fixtures, and handling) does not compromise the particular pack before describing it as non-destructive.

How small a leak can package integrity testing detect?

There is no single minimum detectable leak size for all packages and methods. Detection capability depends on the test principle, package characteristics, contents, headspace, and operating conditions. Establish sensitivity using representative samples and suitable leak references. A hole-size or leak-rate claim should always identify its test conditions, and it should not be applied to every package tested on the same instrument.

Can I test filled packages, liquid-filled packs, or packs with little headspace?

Some methods can test filled packages, but compatibility must be assessed for the specific product and format. Liquids or other contents may block a leak pathway, while available headspace can affect the measurement. For example, ASTM F2095 pressure decay testing has restrictions on liquid contact with seals or surfaces. Provide representative filled packs and product details so a suitable method can be evaluated.

How are pass/fail limits established for package integrity testing?

Pass/fail limits should be based on the application’s integrity requirement and evidence from method development and validation. Compare responses from known-good packs with those from representative leaking samples or calibrated leak references. Account for normal package variation and measurement variability. An instrument’s default threshold is not automatically a validated acceptance limit for your package.

Which standards apply to package integrity and leak testing?

The appropriate standard depends on the method and packaging scope. Relevant examples include:

• ASTM F2338: non-destructive leak detection by vacuum decay.
• ASTM F2095: pressure decay testing of flexible packages, with or without restraining plates.
• ASTM F2096: gross leak detection by internal pressurisation and bubble observation.

Confirm the applicable edition, material scope, and procedure. Seal strength standards such as ASTM F88 address a different measurement and should not be presented as leak-detection methods.

Should package integrity testing be carried out in the laboratory or on the production line?

The location depends on the purpose of testing and the capabilities of the selected system. Laboratory testing supports method development, investigation, and validation. Routine production control may use sampled packs or suitably configured production inspection systems. Confirm sensitivity, cycle time, handling, and repeatability under actual operating conditions before transferring a laboratory procedure to production. Testing frequency should follow the validated control plan and application requirements.