of Unrestrained Packages ASTM F2029 – Standard Practice for Making Heat Seals for Determination of Heat Sealability of Flexible Webs Measured by Seal Strength ASTM F2054 – Standard Test Method for Burst Testing of Flexible Package Seals Using Internal Air Pressurization Within Restraining Plates ASTM F2824 – Standard Test Method for Mechanical Seal Strength Testing for Round Cups and Bowl Containers with Flexible Peelable Lids External links Teardown and Schematic of an Impulse Sealer Plastics industry Packaging machinery