Tamper evident and security packaging

High specification tamper evident envelopes produced using patented “Envelock” technology. Envelock is manufactured to client specifications using co-extruded films to deliver clear, coloured or opaque bags in-line with the client requirements.

These tamper-proof security envelopes are Plasto-Sac’s exclusive patent. They provide the perfect solution for moving money, classified materials or items of value for customers such as security and courier services, security forces, government and legal institutions, credit card companies, banks, etc.

Plasto-Sac offer specially coextruded colours in a matte or paper-like finish which can be printed up to 8 colours.

Envelock is approved by International Labs & Customers:

Germany – ISEGA

Holland – TNO


S. Africa – Fidelity

U.K. – Barclays Bank


Envelock® features have been certified by well-known laboratories worldwide and by our valuable international customers.

Please contact a member of our team for more details on 0845 508 1465