Heat
strengthened glass is defined by the GTA Engineering
Standards Manual as partially-tempered glass with a
surface compression between 3,500 and 10,000 psi., or an
edge compression between 5,500 and 9,700 psi.
Fracture pattern varies over the stress range, from large
"almost annealed" fragments to small
"almost tempered" particles. This type of
glass is the preferred choice when added strength and
resistance to thermal stresses are required, but safety
glazing is not.
Approximately
twice the resistance to uniform static loading of
annealed glass.
Greater impact
resistance.
Able to
withstand greater thermal stresses normally associated
with solar exposure.
Does not break
spontaneously due to Nickel Sulfide inclusions.
Less optical
distortion than fully tempered glass.
