GlassCatalogue_LowRes

Glossary Of Terms / I
Infra-red
The part of the solar spectrum that is invisible to the human eye (780-2500nm wavelength).
Insulating glass unit (IGU)
Two or more panes of glass spaced apart and factory sealed with dry air or special gases in
the unit cavity. Often abbreviated to IGU or DGU and referred to as a unit or double glazing.
Airtight seal
Two panes of glass
Sealed air space
Spacer
Airtight seal
Desiccant to absorb moisture
Integrity
For glass means that it holds together after fracture.
Interlayer
Plastic material used between two or more glass panes in the manufacture of laminated
safety glass to bond the glass together.
Interspace
The common boundary surface between two substances, such as where the insulating
glass unit meets the channel.
Intumescent interlayer
A type of interlayer in fire-resistant laminated glass. The interlayer becomes an opaque
heat shield when exposed to fire.
Iridescence
A surface rainbow effect similar to an oil-on-water appearance. Normally caused by
atmospheric moisture or alkali attack.
Irregular shape
A shaped piece of glass that is not a straight edged rake and cannot be expressed as a size
on paper without a diagram.
236 Product Catalogue For Glass Processors & IG Manufacturers