{"id":7719,"date":"2026-11-08T01:28:05","date_gmt":"2026-11-08T01:28:05","guid":{"rendered":"https:\/\/www.heyipackage.com\/?p=7719"},"modified":"2026-11-08T01:28:05","modified_gmt":"2026-11-08T01:28:05","slug":"pouch-seal-strength-vs-leak-testing","status":"publish","type":"post","link":"https:\/\/www.heyipackage.com\/fr\/pouch-seal-strength-vs-leak-testing\/","title":{"rendered":"Pouch Seal Strength vs. Leak Testing: What Buyers Should Check"},"content":{"rendered":"

Seal strength and leak integrity answer different questions.<\/strong> A seal-strength test measures resistance to separation; an integrity test looks for leakage paths. Before approving a food pouch, buyers should agree which risks need checking, which methods fit the package and what evidence will count as acceptance. A strong pull-test result alone is not a leak-test report.<\/p>\n

For a purchasing team comparing pouch samples, the useful question is not simply \u201cDid it pass?\u201d It is \u201cWhat was tested, under which conditions, and against which agreed requirement?\u201d<\/p>\n

What a seal-strength result tells you<\/h2>\n

ASTM F88\/F88M-23<\/a> covers testing the force needed to separate a specimen containing a seal, including how the specimen fails. Its public summary explains that sample support can affect the result and identifies three techniques: A, B and C. Ask the laboratory to name the technique rather than comparing unexplained numbers.<\/p>\n

As a buyer, request a report tied to an identifiable material, pouch version and production lot. Record specimen width, reported units and the seal location sampled. A result from a side seal should not quietly become evidence for every seal on the finished bag.<\/p>\n

A real number\u2014and its limits<\/h2>\n

The public scope of ASTM F2096-11(2019)<\/a>, an internal-pressurization bubble method, reports sensitivity down to 250 micrometres (0.010 inch), with an 81% detection probability<\/strong>. The same scope says sensitivity has not been evaluated for nonporous packaging or for porous materials other than spunbonded polyolefin.<\/p>\n

That limitation matters when considering the method for a flexible food pouch. The figures are published method information, not a HEYI test result, a universal detection guarantee or a product defect rate. Ask the laboratory to establish suitability and sensitivity for your actual construction; do not copy the number into a purchase specification as a guaranteed capability.<\/p>\n

Choose evidence for the question being asked<\/h2>\n\n\n\n\n\n\n\n
Buyer\u2019s question<\/th>\nEvidence to request<\/th>\nWhat it does not establish by itself<\/th>\n<\/tr>\n<\/thead>\n
How resistant is the sampled seal to separation?<\/td>\nA seal-strength report with method and specimen details<\/td>\nAbsence of leakage paths throughout the package<\/td>\n<\/tr>\n
Does this package show leaks under the chosen conditions?<\/td>\nAn appropriate integrity-test report with conditions and sensitivity<\/td>\nPerformance under every distribution or storage condition<\/td>\n<\/tr>\n
Will the supplied bag work on our filling line?<\/td>\nA documented trial using the intended bag and sealing process<\/td>\nValidation of unrelated bag sizes or future material changes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Separate the supplier\u2019s seals from your final closure<\/h2>\n

When a pouch arrives with an open filling edge, the final closure is made later. Define who owns that step and which samples represent it. Request separate identification of factory-made seals and customer-made closures in the approval record.<\/p>\n

For resealable formats, also distinguish the zipper from a heat-sealed closure. Specify which part is being assessed rather than treating \u201cclosed bag\u201d as a complete test description. HEYI\u2019s custom stand-up pouch range<\/a> includes zipper and window options; the selected format should be identified before agreeing the inspection plan.<\/p>\n

Put a short acceptance plan in writing<\/h2>\n

Before requesting tests, agree the following with the supplier and, where needed, a qualified laboratory:<\/p>\n