Heat treating is a process that imparts additional strength to flat glass products. Heating and
cooling cycles are carefully controlled to produce Heat Strengthened or Fully Tempered glass.
Heat strengthened glass is twice as strong as annealed glass but retains the same breakage
characteristics. Defined by ASTM C 1048 to have a surface compression between 7500 amd
3500, Heat Strengthened glass is not considered a safety glazing material. Heat Strengthened
glass is the preferred process to resist thermal stress and provide additional load resistance
Fully tempered glass is four times stronger than annealed glass and is considered a safety
glazing material. The strength imparted in the tempering process dramatically increases the
ability of fully tempered glass to resist bending forces. The heat treating process does not
change the rigidity or deflection characteristics of glass. The very high strain induced in the
quenching process will cause the glass to fragment into innumerable small fragments or roughly
cubicle pieces. The small fragments are rough, sharp, and may interlock. With little structural
integrity the majority of the glass often falls from the opening. The interlocking clumps, though
properly fragmented, can and do remain intact until impact with a solid surface. This inherent
characteristic and the risk of spontaneous breakage are tradeoffs to the added strength and
safety for human impact. The design professional should consider the location and proximity
of populated areas below fully tempered glazing. The resulting debris from fallout can cause
serious injury. Areas of high risk can usually be accommodated with laminated construction to
Trulite safety glazing products are permanently marked with a logo. This is a trade mark of our
organization and it represents our commitment to quality assurance. The logo is also indicates
certification of conformance to both ANSI Z 97.1 - 2004 and CPSC 16 CFR 1201. Each location
is must provide routine samples to nationally recognized laboratories to verify compliance to
industry and government standards. The application of our trade logo to each piece at the time
of manufacture is your assurance and our guarantee of compliance. The permanent marking
contains information regarding test standards, classification, thickness and branch location.
Safety glazing logos must be visible and legible after installation to comply with national building
and elevator codes. Trulite will not certify any certification of safety glazing by temporary label,
shipping document, or letter. Using or installing any glass in hazardous locations not fully in
compliance is unsafe and illegal.
Available in thicknesses from 1/8" to 3/4".
Contact your local Trulite representative for further details.