Glass
- 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
- 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
- Crown Process
- 1. Fuse various raw materials in large proportions with application of heat
- 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
- Borosilicate Glass
- 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
- Definition
- 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
- Crown Process
- 1. Fuse various raw materials in large proportions with application of heat
- 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
- Float
- 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
- Definition
- Glass
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