Envelope sigel C5 DU202 90 g/m² gummed Grey Marble with inner print

The sigel C5 DU202 envelope is a gummed C5-format envelope produced from 90 g/m² paper with a grey marble exterior and an inner print for increased privacy. Designed to fit C5 documents and folded A4 sheets, this envelope combines a professional appearance with reliable gummed sealing. The inner print reduces show-through of contents while the grey marble surface provides a neutral, tasteful look suitable for a range of correspondence.

Advantages

The 90 g/m² paper offers a balanced stiffness that protects contents without excessive bulk. The gummed flap provides a secure, tamper-evident closure once moistened and pressed, and the inner print improves confidentiality by masking text and images inside the envelope. The grey marble finish presents a consistent, professional appearance for business mailings and formal communications.

Suitable for

• Mailing folded A4 documents or C5-sized inserts
• Business letters, invoices and formal correspondence
• Invitations, certificates and printed materials requiring discretion
• Everyday office mail and customer communications

Key specifications

• Format: C5 (suitable for folded A4)
• Paper weight: 90 g/m²
• Closure type: gummed flap (moisten-to-seal)
• Exterior finish: grey marble
• Interior: printed lining for increased privacy

How to use

Insert the document or folded A4 sheet into the envelope so it sits flat and straight. Moisten the gummed flap evenly—either with a sponge, damp cloth or by licking the strip—and press the flap firmly against the envelope body to create a sealed closure. Allow a few seconds for the adhesive to bond fully before stacking or mailing to ensure a secure seal.

Usage recommendations

Store envelopes flat in a dry environment to prevent humidity from affecting the gummed adhesive. For important or heavy contents, consider reinforcing with internal packaging or using a stronger envelope; avoid overfilling to maintain a reliable seal.