From raw film to finished pouch, GBPI provides the barrier, seal, mechanical and migration testing equipment that flexible packaging manufacturers, converters and QC labs use to verify shelf life, seal integrity and regulatory compliance.
Stand-up pouches, retort bags, sachets and multilayer films are engineered to keep moisture, oxygen and aroma exactly where they belong. A barrier value that's off by a fraction, or a seal that's a few microns thinner than spec, can shorten shelf life, trigger a recall, or fail a customer's incoming-goods inspection. Testing that structure before it leaves the plant — not after a complaint — is the core job of the instruments below.
Water vapor and oxygen ingress that isn't caught in QC shows up later as spoiled product, off-flavors, or oxidized contents.
Inconsistent heat-seal strength or hidden channel leaks lead to field failures that are expensive to trace back to a single production run.
Brand owners, retailers and export markets increasingly require documented test data against ASTM/ISO standards before they'll approve a packaging supplier.
These are the properties GBPI instruments are built to measure across film, laminate and finished pouch formats — the same parameters referenced in most customer specifications and retort/food-contact qualification packages.
| Property | Why it's tested | Reference standards | Recommended instrument |
|---|---|---|---|
| Water Vapor Transmission Rate (WVTR) | Predicts moisture-driven shelf-life for dry foods, snacks, powders and pharma blister/pouch formats | ASTM F1249 / E96, ISO 15106 | Water Vapor Permeability Analyzer |
| Oxygen Transmission Rate (OTR) | Determines oxidation risk for fatty foods, coffee, MAP-packed meat and beverages | ASTM D3985, ISO 13274 | Oxygen Permeability Analyzer |
| Gas Transmission Rate (CO₂/N₂, etc.) | Verifies barrier performance for carbonated beverages and modified-atmosphere packaging | ISO 2556, ASTM D1434 | Gas Permeability Analyzer |
| Heat-Seal Strength | Confirms seal integrity across the sealing window used on the production line | ASTM F2029 / F88, ISO 11607-2 | Laboratory Heat Sealer + Tensile Tester |
| Package Leakage / Seal Integrity | Detects pinholes, channel leaks and weak seals on finished pouches before shipment | GB/T 15171, ASTM D3078 | Leakage Tester |
| Tensile Strength & Elongation | Verifies film can withstand line tension, drop and handling without tearing | ASTM D882, ISO 527-1 | Tensile Tester |
| Coefficient of Friction (COF) | Ensures reliable feeding, forming and stacking on packaging/filling lines | ASTM D1894, ISO 8295 | Coefficient of Friction Tester |
| Puncture & Impact Resistance | Predicts survival through distribution — drop, stacking and transit abuse | ASTM D3420 / F1306, ISO 6603 | Falling Dart Impact Tester |
| Film Thickness & Uniformity | Confirms gauge consistency, which underlies every other physical and barrier result | ASTM D374, ISO 4593 | Thickness Tester |
| Residual Solvent & Odor | Screens printed/laminated film for solvent taint before it reaches food contact | Internal GC method, ASTM E679 | Gas Chromatography |
The same core test set applies across industries — what changes is which properties matter most and which standards a customer or regulator expects to see.
Stand-up pouches, retort bags, MAP trays and flow-wrap film — WVTR, OTR and seal strength drive shelf-life claims.
Blister laminate, sachets and strip packs — barrier and seal data support stability filings and ISO 11607 qualification.
Spouted pouches and juice/oil sachets — gas barrier, spout-seal integrity and drop resistance are the priority tests.
Sachets, refill pouches and laminate tubes — seal strength, COF for line runnability, and barrier for actives.
A typical flexible packaging QC lab builds around a barrier tester, a tensile/seal tester and a leak tester. These three cover the majority of specification and customer-audit requirements.
Exact applicable standards depend on the instrument model and test method selected — confirm the specific standard for your product with our team before specifying.
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