Glass

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  • Created by: s013693b
  • Created on: 02-05-14 21:55
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  • Glass
    • Definition
      • An inorganic product of fusion which has cooled to a rigid condition without crystallising.
    • Glass has no specific melting point
    • Additives
      • Formers = Network Formation
      • Fluxes = Softeners
      • Stabilizers = Provides Chemical Resistance
    • Colours
      • CdS = Red
      • CoO = Blue
      • FeO = Green
    • Glass Manufacture
      • 1. Fuse various raw materials in large proportions with application of heat
        • 2. Form into shape or roll into flat sheet
          • 3. Cool at a fast enough rate to avoid distortion but to avoid cracking
      • 2. Form into shape or roll into flat sheet
        • 3. Cool at a fast enough rate to avoid distortion but to avoid cracking
      • Processes
        • Crown Process
          • Ribbon of melt continuously drawn to form sheet glass
        • Continuous formation
          • Production of glass disc from malten lump
        • Float Process
          • Made by floating molten glass on a bed of malten metal, typically tin
    • Borosilicate Glass
      • B2O3
      • AKA Pyrex
    • Types of Glass
      • Borosilicate Glass
        • B2O3
        • AKA Pyrex
      • Float
        • AKA Plate Glass
      • Coated - Mirror
      • Leaded Glass - Crystal Glass
      • Tempered Glass (cuboid shaped)
        • Rapid heating and cooling (annealing) 600C and above
        • 4-5 times stronger than normal glass
      • Laminated
      • Soda Lime
    • The basic structure of glass is tetrahedral
    • Evidence
      • Glass is contact evidence
      • Glass is stable evidence - it doesn't change over time
      • Hard to discriminate glass of the same type
      • Frequently encountered at crime scenes
  • The arrangement of atoms in glass are random
    • Glass
      • Definition
        • An inorganic product of fusion which has cooled to a rigid condition without crystallising.
      • Glass has no specific melting point
      • Additives
        • Formers = Network Formation
        • Fluxes = Softeners
        • Stabilizers = Provides Chemical Resistance
      • Colours
        • CdS = Red
        • CoO = Blue
        • FeO = Green
      • Glass Manufacture
        • 1. Fuse various raw materials in large proportions with application of heat
          • Processes
            • Crown Process
              • Ribbon of melt continuously drawn to form sheet glass
            • Continuous formation
              • Production of glass disc from malten lump
            • Float Process
              • Made by floating molten glass on a bed of malten metal, typically tin
        • Types of Glass
          • Float
            • AKA Plate Glass
          • Coated - Mirror
          • Leaded Glass - Crystal Glass
          • Tempered Glass (cuboid shaped)
            • Rapid heating and cooling (annealing) 600C and above
            • 4-5 times stronger than normal glass
          • Laminated
          • Soda Lime
        • The basic structure of glass is tetrahedral
        • Evidence
          • Glass is contact evidence
          • Glass is stable evidence - it doesn't change over time
          • Hard to discriminate glass of the same type
          • Frequently encountered at crime scenes

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