GlassCatalogue_LowRes

Glossary Of Terms / B
Bloom
A surface defect on glass resulting from atmospheric attack or deposition by smoke or
other vapours.
Blow - in
A separation of glass and interlayer at or close to the edge of laminated glass.
Body tinted glass
Glass produced by the addition of metal oxides to the normal raw materials for making
clear glass. This does not affect the basic properties except for the colour and solar
energy transmission. Refer to Tinted Glass.
Bond
The attachment at an interface between two substrates.
Borosilicate
Glass that contains boron and silica. Boron improves resistance to thermal shock.
Bow
Not straight or flat - has a bend.
Break pattern
The resultant pattern formed by the cracks within an individual piece of glass when broken.
Breather tube
A tube installed into an insulated glass spacer when the unit is made. Primarily used when
IGUs are being installed at high altitudes where the pressure is different. These tubes must
be sealed on the job site prior to unit installation. Refer to Capillary Tube.
Brewster’s fringes
A rainbow effect sometimes seen in double glazing caused by the light changing direction
from identical thicknesses of glass.
Brilliant cut
Decorative process in which designs are cut into glass with abrasive and polishing wheels.
Refer to V cut.
British thermal units
Amount of energy (in imperial units) needed to raise one pound of water from 63°F to 64°F.
Bronze glass
Glass with a bronze tint.
Bubble
Air or glass captured in glass. In laminated glass, a gas pocket in the interlayer material or
between the glass and the interlayer.
Bullet resistant glass
A multiple laminate of glass that is designed to resist penetration from bullets.
224 Product Catalogue For Glass Processors & IG Manufacturers