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Heat Treating
Sealed Insulating Units





SHAPE CATALOG
TECHNICAL INFORMATION
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STANDARDS & WARRANTIES
 

Heat Treating Glass

SIGCO heat treats 1/8” through 3/4” glass using a brand new, state-of-the-art, convection tempering oven.

SIGCO offers two heat treated products – heat strengthened glass and fully tempered glass. Heat strengthened glass has approximately twice the mechanical and thermal strength of annealed glass. Heat strengthened glass is NOT a safety glazing product.

Fully tempered glass has approximately four times the mechanical and thermal strength of annealed glass and is a safety glazing product. Consequently, when fully tempered glass breaks, it “dices” into many small pieces – instead of several large, sharp shards.

SIGCO applies a small, sandblasted logo in the corner of each lite of heat treated glass, unless the customer requests otherwise.

Please note that once glass has been heat treated, it should not be field altered. Tempered glass should not be subsequently edged, drilled, milled, or sandblasted.

Heat treated glass is also more susceptible to spontaneous breakage. This breakage can occur from small inclusions, impact or wind borne debris. Particular care should be taken to protect installed product from masonry run off or weld splatter.

SIGCO heat treats glass horizontally, over a bed of ceramic rollers. Contact with these rollers may create surface waves. These waves will cause distortion when viewing reflected images from a distance. SIGCO makes every effort to maintain distortion parallel to the sill, however this distortion is not considered a defect.

The nozzles in the quench section can leave a strain pattern most visible when viewed under polarized light and acute angles. This pattern is also inherent in the process and not considered a manufacturing defect.

For more information on acceptable industry standards for heat treated glass, please reference ASTM C-1048.
       
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