| http://www.w3.org/ns/prov#value | - The thickness of the annuiar thin film sealing element may for example be commensurate with the thickness of the sheath itself, and leak-tight sealing of such low thickness films requires very accurate sealing techniques, such as heat sealing or ultrasonic bonding at low dimensional tolerances, which avoid the rupture or piercing of the films during their bonding to one another.
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