On average the hardness of glass is about 5.5 on the Moh’s scale) (Because the composition can vary, so can the hardness. Hard surface – Glass resists scratches and abrasions.Special tempering can minimize surface flaws. Mechanically Strong – Glass has great inherent strength and is weakened only by surface imperfections, which give everyday glass its fragile reputation.Windshields of automobiles are made with laminated glass.Laminated glass is two sheets of ordinary glass bonded together with a plastic film.
#DEFINE RADIAL FRACTURE GLASS WINDOWS#
Tempered glass is used in the side and rear windows of automobiles.Float glass gets its name because the SODA-LIME Glass is cooled on top of a bath of molten tin Fused silica glassvery difficult to make and can withstand temperatures up to 1200 degrees for short periods.Ninety six percent silica glass- resistant to heat shock up to 900 degrees.Aluminosilicate glassused as resistors for electronic circuitry.Borosilicate glass– high resistance to temperature change Pipelines, light bulbs, photochromic glasses, sealed-beam headlights, laboratory ware, and bake ware.Lead glasswill not withstand high temperatures, art glass, electrical insulating properties.Soda-lime glass 90% of all glass, container glass and flat glass, resistance to high temperatures and sudden changes in temperature not good.This is a METAL oxide and is added to prevent the “SODA-LIME GLASS” from dissolving in water.
SAND = silicon dioxide (Major Component).Stabilizers- strengthen the glass and make it resistant to water.Fluxes- change the temperature at which the formers melt.Formers-major portion of what makes up the glass.There are thousands of different uses for glass.Match pieces by density, refractive index, thickness, fracture patterns, color.
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