With advancements in energy performance, the Glass, Construction and Architecture industries have seen an increase in heat gain around buildings’ spandrel cavities. This heat gain in spandrel areas results in temperature gradients across the glass that may result in breakage of the inboard glass lite.
Glass strength facts, silicone opacifiers vs ceramic enameled heat-strengthened glass.
I'll leave you with this great video shot a few days ago. 13 mil applied OPACI-COAT-300, a 1.18# steel ball dropped from 11.5 feet high. This is an actual ASTM test standard for breakage of glass. Clear tempered glass breaks around a 4 feet high ball dropped.