Plastic Seals

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What are plastic seals and where are they used?

Plastic seals are one-time, tamper-evident devices that lock a closure and show visible proof if it has been opened. Because they are pull-tight (pull-through) designs, the tail passes through a locking chamber and cinches around the item — for example a truck door, a cash bag or a meter. In addition, most plastic types are “indicative” rather than barrier devices, so they reveal interference in the supply chain rather than resist forced entry. Every unit carries a unique serial number for tracking, and many come in several colours and strengths. Therefore, the right choice depends on the application, the required tail length and the strength needed.

Plastic seal types

Because applications differ, the table below groups the main pull-tight types and their typical use.

Type	Strength	Typical use
Light-duty pull-tight	Low	Fire extinguishers, totes, first-aid boxes
Medium-duty pull-tight	Medium	Vehicle doors, catering carts, roll cages
Heavy-duty pull-tight	High	Bulk tankers, cash-in-transit, cargo doors
Metal-insert / detectable	High	Sacks, cages; food lines needing detection

Choose the tail length and strength to suit the application; sold with sequential numbering.

Plastic seals — frequently asked questions

Show FAQ

What is a pull-tight seal? It is a plastic device whose tail passes through a locking chamber and cinches around the item. Because it cannot be reopened without breaking, it shows clear evidence of tampering.

Are plastic seals high-security? No. Most plastic types are indicative devices, so they reveal interference rather than resist forced entry. For barrier strength, choose a bolt or cable seal instead.

Can plastic seals be numbered? Yes. Each unit carries a unique serial number, and sequential numbering is available, which supports tracking and audit in the supply chain.