FSC239Y5 Lecture Notes - Lecture 6: Cobalt Glass, Borosilicate Glass, Bulletproof Glass
Document Summary
Centre of forensic sciences > chemistry section > trace evidence > glass. What is it made from: raw material. Sand/silica ~72% of glass, easy to examine silica. Alumina/feldspar: other ingredients may include boron (borosilicate glass: pyrex) or lead (tableware, Tv/video tubes: the chemical composition of the glass is the main factor determining its optical and chemical properties. Properties: solid, hard, brittle, transparent, non-crystalline (amorphous, frozen liquid) Flat glass (sheet glass, window glass: used for architectural and automotive windows, float glass is the most common type of flat glass: during manufacturing the glass is floated on liquid tins. Almost all flat glass today is made using this method: float glass: high quality glass, smooth surfaces. Container glass: made from the same ingredients as flat glass, then molded into bottles and jars, coloring agents may be added, has a shorter lifespan than flat glass, so more is produced. Other: glass fibers, optical glass, decorative glass, light bulbs.
