Glassary - W

Warwick™:
Pilkington Warwick™ is the brand name for one of the Pilkington Texture Glass™ range (see consumer leaflet Pilkington Texture Glass™) of patterned glass. Pilkington Warwick™ has an obscuration level of 1.

Wavelength:
a characteristic of electromagnetic radiation, by which it can be described. Usually used to discriminate between different types of electromagnetic radiation, such as visible, UV and infrared (heat).

Weight:
the area density of a pane glass, expressed in kg/m2. Glass weighs 2.5 kgs/m2 per mm of thickness (i.e. 4mm = 10kgs/m2, 6mm = 15kgs/m2, 10mm = 25kgs/m2).

Weighted sound reduction index (Rw):
incorporates a correction for the ear's response and has been derived in accordance with BS 5821:
1984 (see acoustic properties).

Whisperply™:
an old brand name for Pilkington Acoustic Laminated (see Product Data Sheet).

Wind resistance:
the ability of the glass to withstand wind loads. See Technical Bulletin Glass and Wind Loading.

Wired glass:
generic name which covers polished wired glass and wired cast glass. Our product range is called Pilkington Pyroshield™.

Wired cast glass:
the old generic name for Pilkington Pyroshield™ Textured. Glass with a welded steel mesh incorporated within the body of the semi-molten glass and formed by passing between two rollers, one of which forms an impression or pattern into the glass.