Wafer Seal Guidelines - Blue Hill Press

USPS requires that letter-size self-mailers prepared for automation rate mailings must be secured to prevent an open edge from jamming high-speed processing equipment.

Number and location of tabs (or wafer seals) are specified for particular types of letter-size mail based on, among other criteria, location of folded or bound edge.

Standards for tabbing are complex, but the following may be used as a fundamental guideline.

Tabbing Specifications for Automation Rate Mailings

Tabbing Guidelines

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