Seal strength, determined by ASTM F88, is a quantitative measure used in process validation, process control and capability. It is relevant to the opening force, package integrity and packaging processes. Seal strength is a necessary package requirement. ASTM F88 is popular for testing medical packaging.
Scope:
The ASTM F88 method covers the measurement of the strength of seals in flexible barrier materials. It is conducted on seals between a flexible material and a rigid material. Seals tested may be from any source, laboratory or commercial. ASTM F88 measures the force required to separate a test strip of material containing the seal.
Test Procedure:
The maximum seal force and average force to open the seal are calculated in ASTM F88 and are reported. A portion of the force is measured while testing materials using a bending component.
A number of fixtures and techniques have been devised to hold samples at various angles to the pull direction to control this bending force. Because the effect of each of these on test results is varied, consistent use of one technique (unsupported, supported 90° by hand, or supported 180°) is recommended throughout the process.
Sample size:
ASTM F88 covers the measurement of the strength of seals in flexible barrier materials. It is
conducted on seals between a flexible material and a rigid material.
Data:
The values in ASTM F88 are standardly stated in either SI units or inch-pound. These values
stated in each system may not be exact equivalents; therefore, each system shall be used
independently of the other.
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