Blister packaging · Industry glossary
Barrier properties
The ability of a material or package to restrict passage of a specified gas or vapour.
Also called: barrier performance; moisture barrier; oxygen barrier.
What does “high barrier” mean for a blister?
It needs a named substance and a defined object. Water vapour, oxygen and light are different protection questions. “High barrier” alone does not specify which was assessed, on what construction or under which conditions.
Retain the permeant, material structure, specimen state and test environment. A material family name or marketing grade is not a replacement for those fields. Oxygen and moisture results describe different transfer questions, not one interchangeable barrier score.
Why is a film datasheet insufficient for a formed blister?
A flat specimen has not undergone the forming and sealing history of a finished pack. Cavity geometry and local thickness distribution are part of the formed-package question. Identify the specimen rather than silently substituting roll-material data for package evidence.
Flat-film results, formed-wall measurements and complete-pack transmission tests describe different stages of the packaging structure. Choose evidence that matches the stage being assessed.
| Evidence | What remains a separate question |
|---|---|
| Flat-film transmission result | Performance after the intended forming and sealing operations. |
| Formed-cavity thickness examination | Transmission and leak integrity of the complete sealed pack. |
| Complete-pack transmission result | Suitability for the particular product and storage life. |
Barrier performance, leak integrity and shelf life
No single transmission value establishes both. Material permeation, leakage through defects and product changes during storage are different questions. The integrity page addresses defect paths; the transmission pages explain rates and conditions.
Direct package evaluation and a storage study involving the packaged product answer different questions. Barrier measurements can contribute to a product-specific shelf-life assessment; they do not establish a universal shelf life for supplements.
IN THE PRODUCTION LINE
Define requirements
Terminology checked .