Glossary

S

Santoprene

A highly resilient and very durable thermoplastic material, closely resembling Neoprene rubber in its properties.

Satin anodised

A hard, durable, electrolytic finish applied to aluminium extrusions which greatly enhances the appearance by imparting a satin sheen. It is naturally clear, giving a silver effect, but coloured tints such as bronze, gold or gunmetal may be incorporated to order.

Single action

Refers to door assemblies in which the leaves are able to open in just one direction of pedestrian travel.

Smoke seal

Any seal designed to greatly reduce the transmission of smoke from one side of a door assembly to the other.

Sound pressure

The property of airborne sound which, combined with frequency, determines how easily it will transfer from one side of a door assembly to the other.

Sound wave

Refers to airborne sound in the form of a longitudinal wave, having a frequency and an amplitude.

Stile

A vertical reinforcing member in a door leaf – but also a commonly- used reference to the outside vertical edge of a door leaf.

STC

Sound Transmission Class. A single figure performance indicator very similar to Rw but derived from ASTM-E413 Classification for rating sound insulation.

Stop

The raised part of a door frame which prevents the leaf from swinging any further than needed to achieve the full closed position.