Envelope C4 NC Koperty NK 500 pcs — 229 x 324 mm, white, gummed flap

NC Koperty Envelope C4 NK (500 pcs) is a pack of white paper envelopes sized 229 x 324 mm, intended for mailing A4 documents either flat or folded once. These envelopes feature a gummed (water-activated) flap that creates a secure seal after moistening. The product is designed for office, administrative and postal tasks including sending invoices, contracts, brochures and A4 printouts.

Advantages

The envelopes are made from white paper that provides a neutral, professional appearance suitable for business correspondence. The gummed flap ensures a tamper-resistant closure when activated with water, and the C4 format accommodates A4 sheets without the need for extensive folding. Supplied in a bulk pack of 500 pieces, the set supports high-volume mailing and reduces the need for frequent reordering.

Suitable for

• Mailing A4 documents flat
• Sending invoices and financial documents
• Distributing brochures and printed materials
• Archiving and internal document transfer

Key specifications

• Format: C4 (229 x 324 mm)
• Quantity: 500 envelopes per pack
• Color: white
• Closure type: gummed (water-activated) flap
• Material: paper

How to use

Insert the A4 document either flat or folded once into the envelope. Moisten the gummed flap lightly using a sponge, a damp cloth or by applying a small amount of water along the adhesive strip, then press the flap down firmly to ensure a full seal. Allow a short drying time before handling to ensure the adhesive bonds and the envelope remains closed during transit.

Usage recommendations

For secure mailing, avoid overfilling the envelope beyond its capacity and ensure the flap is evenly moistened before sealing. Use a rubber roller or press firmly along the flap to improve adhesion. For sensitive or important documents, consider adding a protective sheet or placing the item in a plastic sleeve prior to inserting it in the envelope.