Triplast White Self Seal Security Envelopes are the perfect mailing supply to save you time and effort. They are designed to stay sealed with no tape, glue or any kind of moisture. Just close the flap and press shut! The high-security blue tinted pattern on the inside will ensure the contents remain safe and secure without revealing sensitive details. Manufactured with a 90 gsm thickness for an ideal blend of lightness and durability, these envelopes are perfect to be used on a daily basis at home, at work, or in commercial settings. Sustainably produced, the paper used to make them is sourced from forests that have been well-managed, controlled, audited, and certified, and do not contribute to deforestation.

There are a wide variety of sizes and quantities to choose from. The sizes available are: C4 (324x229mm), C5 (229x164mm), DL (110x220 mm), & C6 (114x162mm). We also stock them in 2 other types: Window Self Seal Security Envelopes & Manilla Self Seal Security Envelopes.

About Triplast

We are a UK based manufacturer, distributor and supplier of packaging products & office supplies including cardboard boxes, bubble wrap, kraft wrapping paper, corrugated cardboard paper, plastic mailing bags, bubble padded envelopes, cardboard & paper envelopes and other e-commerce, retail & industrial packaging products.

Our years of experience and well established presence in the flexible packaging industry coupled with our state-of-the-art automated machinery means you can be rest assured when buying our products.

We have great confidence in our products but if for any reason you are unhappy with your purchase, please send us a message and we promise to revert to you with a swift resolution.