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4
Closing, Sealing, and Reinforcing

4-1 General

Closing, sealing, and reinforcing are primary considerations in preparing the outside of a parcel for mailing. The main materials for closing, sealing, and reinforcing mailing containers are adhesives, bandings (strappings), staples and steel stitching, and tapes (gummed and pressure-sensitive). Friction closures, screw caps, and locking devices are used to close and seal cans and similar containers.

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