Glossary

T

Thermoplastic

A synthetic material which can be formed to a specific shape by applying heat and compression – eg, by injection moulding or extrusion.

Threshold gap

The clearance necessary for everyday operation at the bottom of a door leaf.

Threshold seal

Any seal designed to bridge the threshold gap when the door leaf is in the closed position.

Threshold plate

A metal strip designed to fit across the doorway to form a level surface on which a better sealing efficiency may be achieved. It may also provide a transition from one floor surface to another.