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ASTM F88 | Packaging | Peel Testing

ASTM F88 seal strength is not only relevant to opening force and package integrity but to measuring the processes ability to produce consistent seals. Seal strength is a necessary package requirement and oftentimes it is desirable to limit the strength to facilitate opening the package. Properties of interest are the maximum seal force and in some cases the average force to open the seal.

A portion of the force measured to open the seal may as a result of bending forces. Thus, three techniques (A: Unsupported; B: Supported by Hand 90deg; C: Supported 180 deg ) have been devised to hold the samples at various angles to help control the bending forces. Because each technique will produce different results, it is important that the same technique is used for all tests in the same batch and noted in the report.

Prior to conducting ASTM F88, it is important to read the entire specification in the relevant ASTM publication.

ASTM F88 | Packaging | Peel Testing

  1. Select the technique used to support the specimen during the test.
  2. Use a sample cutter to cut the test specimens to size. ASTM F88 allows for three different sample widths.
  3. Align the specimen in the grips so that the seal line is perpendicular to the direction of pull. When the sample is loaded in the grips, make sure slack remains in the specimen.
  4. Adjust the testing machine to a constant rate of jaw separation. Refer to the ASTM specification for conforming test rates. Pull the sample until separation occurs.
Calculations:
  • Maximum Force per Unit Width
  • Identify the mode of specimen failure
  • If significant peeling within the seal area occurs, calculate Average Seal Strength. Report the algorithm used to calculate the average
  • If failure is by peeling only, calculate energy to separation

ASTM F88 | Packaging | Peel Testing

ASTM F88 | Packaging | Peel Testing

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