Wafer sealing, commonly called tabbing, involves applying adhesive tabs (known as wafer seals) to fasten unenveloped or folded mail items for handling by the United States Postal Service (USPS). This step is essential for automation-friendly pieces such as self-mailers, booklets, and postcards, ensuring they stay closed during rapid sorting processes and comply with machinability guidelines. Wafer seals should be non-perforated, crafted from materials including paper, translucent paper, vinyl, or plastic, and must stick firmly to the mail piece's edge with limited overhang. They should not obstruct barcodes, postage stamps, or address visibility, and certain paper surface standards must be followed if positioned in barcode clear areas.

USPS mandates that folded letter-sized mailers be secured using wafer seals (often simply called tabs). As Houston's leading mailing specialists, we excel in determining the exact number and placement of wafer seals needed for folded self-mailers. At DMR, we'll guarantee your mail adheres to every USPS guidelines and regulations. We always keep both 1” and 1.5” wafer seals in stock, ensuring we're fully prepared for your folded selfmailer needs.