Envelope set sigel DU257 DIN Lang, gummed, white paper 90 g/m²

Set of sigel DU257 envelopes in DIN Lang format, produced from white paper with a weight of 90 g/m². These gummed (water-activated) envelopes are designed for mailing letters, invoices and documents in a standard long format. The gummed flap creates a secure seal after moistening, making the envelopes suitable for everyday office and private mailing needs.

Advantages

These DIN Lang envelopes offer consistent paper weight for a professional feel and reliable handling. The water-activated gum closure ensures a tight seal once moistened, reducing the risk of accidental opening during transit. The white surface provides a neutral, printable area for addresses, postage, and labels, and the paper weight balances durability with economical use.

Suitable for

• Mailing letters and correspondence in long format
• Sending invoices, statements and delivery notes
• Enclosing folded A4 documents and forms
• Everyday office and private postal use

Key specifications

• Format: DIN Lang (long envelope size)
• Material: white paper
• Paper weight: 90 g/m²
• Closure type: gummed (water-activated) flap
• Surface: printable for ink and label application

How to use

Insert the document folded to fit DIN Lang format, align contents so addresses or window areas are visible if applicable, then moisten the gummed flap evenly and press firmly along the flap to create the seal. Allow a short drying time before stacking or posting to ensure the adhesive bonds fully. For best results when printing addresses directly on the envelope, test print on a single envelope first to confirm feed and ink compatibility with your printer.

Recommendations

Store envelopes flat in a cool, dry place to preserve the adhesive properties of the gummed flap. Avoid prolonged exposure to heat or humidity. When using automated inserting or sealing equipment, confirm compatibility with 90 g/m² paper weight and gummed closures to prevent jams or incomplete seals.