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GLOSSARY OF TERMS
A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z
R:
R-Value
The thermal resistance of a glazing system.
Raw Batch
A glass batch without cullet.
Raw Cullet
A glass batch made of only cullet.
Reflective Glass
Glass with a metallic coating to reduce solar heat gain.
Ribbon
A continuous length of glass in process.
Roller Distortion or Roller Wave
A waviness resulting in horizontal heat-treated glass, as a result of glass being transported through the furnace on rollers.
Rough Opening
The opening in a wall in which a door or window is installed.
Rub
Small scratches in glass, generally caused during shipping.
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