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One or two release cards, each at least 0.007" thick and no more than 0.012" thick, attached to a letter-size mailpiece must have the following characteristics:
- Be rectangular, but with allowance for finished corners having a radius of at least 1/8" up to 1/2".
- Be between 3" and 3-1/2" long (inclusive) and between 2" and 2-1/2" high (inclusive). Affix each card with either edge parallel to the length of the mailpiece. If affixing two cards, affix them on the same side of the mailpiece, and stack the cards vertically or side-by-side across the mailpiece length on the non-address side only.
- Be affixed by machine to ensure adequate adhesion. The Postal Service does not allow manually affixed attachments.
- Be affixed 1" (+/- 1/8") from the bottom of the mailpiece. The card must not interfere with readability of the address, barcode, or postage information. When affixing two cards to a mailpiece, the following additional conditions apply:
- When affixing the cards on the address side, maintain a space of at least 1/2" from the leading edge, the trailing edge, and the top edge.
- When affixing the cards to the non-address side, place the right edge of a card between 5" and 6" from the leading edge of the mailpiece, but no closer than 1/2" from the trailing edge. Maintain a space of at least 1/2" from the top edge.
- Be affixed to a liner (backing) and have the following adhesion standards:
- Adhesive used to affix the backing to the mailpiece must have a peel adhesion of at least 2 pounds/inch to stainless steel with a 20-minute dwell time, at 300"/minute at 90 degrees per American Standard Testing Method (ASTM) test D3330F.
- Adhesive used to attach the release card to the backing must have a peel adhesion of at least 1.5 ounces/inch to stainless steel with a 30-minute conditioning time, at 300"/minute at 90 degrees per ASTM test D3330F.
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