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Manufacture of glass(composition)

here i have given a composition,types and method of manufacturing glass hope will help u

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Manufacture of glass(composition)

  1. 1. MANUFACTURE OF GLASS
  2. 2. SYNOPSIS • INTRODUCTION •TYPES •METHODS
  3. 3. THE GLASS WAS DISCOVERED IN THE REGION OF SYRIA AROUND 5000BC INTRODUCTION INTRODUCTION
  4. 4. •The glass was first discovered in the region of syria around 5000 BC •It is an amorphous compound •It is also known as super cooled liquid •It has no melting point •It has high viscosity which prevents from crystallizing
  5. 5. TYPES OF GLASS MATERIAL
  6. 6. Variety of ophthalmic glass material  Crown glass >>>>> RI= 1.523  Barium crown glass >>>>> RI= 1.6  Borosilicate crown glass >>>>> RI= 1.53  Flint glass >>>>> RI= 1.75
  7. 7. COMPOSITION OF CROWN GLASS
  8. 8.  70% of silica [si] 12% of calcium oxide (or) lime [cao] 15% of sodium oxide [Nao] Small percentages of following compound acts as refining materials which improves the quality of glass Potassium [Ka] Borax [Na2B4O7.10H2O] Antimony [sb] Arsenic [As]
  9. 9. CROWN GLASS
  10. 10. COMPOSITION OF BARIUM CROWN GLASS
  11. 11. 35% of barium oxide[Bao] 30%of silica[Si] Small percentage of following materials Lime[Cao] Zinc[Zn] Alumina[Al] Borax[Na2B4O7.10H2O] NOTE:the effect of barium oxide is to increase the refractive index
  12. 12. BARIUM CROWN GLASS
  13. 13. BOROSILICATE CROWN GLASS
  14. 14. • Borosilicate crown glass is used for windows,lenses and prisms • Transmission ranges between 0.4µm to 1.4µm
  15. 15. BOROSILICATE CROWN GLASS
  16. 16. COMPOSITION OF FLINT GLASS
  17. 17. 60% of lead oxide 30% of silica 8% of soda and potash Small percentage of arsenic and antimony NOTE:the effect of lead oxide is to increase the refractive index
  18. 18. FLINT GLASS
  19. 19. METHODS
  20. 20. There are two methods of manufacturing of glass Individual batch method Continuous flow method
  21. 21. • Six stages are common in both method Mixing Melting Fining Stirring Forming Annealing
  22. 22. THANK YOU 
  23. 23. REFERENCE:  http://www.historyofglass.com/  http://www.pfg.co.za/all-about-glass.aspx  http://www.slideshare.net/Alizeeshansuhail/spectacle- lens-materials  http://www.janostech.com/knowledge-center/optical- materials-guide/borosilicate-crown-glass-bk-7.html  The principles of ophthalmic lenses- M.jalie

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here i have given a composition,types and method of manufacturing glass hope will help u

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