An introduction of different types of glasses

INTRODUCTION, PROPERTIES AND TYPES OF GLASS

1. AN INTRODUCTION OF DIFFERENT TYPES OF GLASSES INTRODUCTION PROPERTIES OF GLASS TYPES OF GLASS

2. INTRODUCTION Glass is a mixture of metallic silicates like pure sand, soda chalk and an alkali metal. It is made with the mixture of sand and silicates in a very hot fire stove called a kiln. It is a hard brittle, transparent, translucent material.

3. PROPRTIES OF GLASS Extremely brittle , transparent, translucent and available in different colors. Has amorphous structure and no definite melting point. Not easily affected by air or water and any chemicals. Absorbs and refracts light. Can be polished, welded by fusion , cast into any desired shape and modify its properties like hardness, refractive power.

4. SODA-LIME GLASS Also known as Soda glass or soft glass. A mixture of sodium silicate and calcium silicate. Cheap and easily fusible at comparatively low temperature. Used in manufacture of glass tube, bulbs, bottles and other laboratory apparatus, window glass etc.

5. POTASH- LIME GLASS Also known as hard glass or Bahamian glass. A mixture of potassium silicate and calcium silicate. Does not melt easily that’s why fuses at high temperatures. Used in the manufacture of combustion tube etc.

6. POTASH –LEAD GLASS Also termed as flint glass A mixture of lead silicate and potassium silicate. Fuses easily and turns black and opaque. Used in the manufacture of lenses , prisms, electric bulbs, artificial gems etc.

7. COMMON GLASS COMMON GLASS- A colored glass that may be yellow, green or brown. A mixture of sodium silicate, iron silicate and calcium silicate. Does not fuses easily but attacked by acids easily Uses in the manufacture of medicine bottles.

8. COLOURED GLASS To produce colored glass, coloring pigment is added which is obtained from metallic oxides, finely divided metals, carbon, salts of metal, sulphur , etc. Different colored glass needs different quantities of same substance. Used for window panels, fancy articles, decorative tiles , etc.

9. CROWN GLASS Slightly convex Free from color and has finer surface Made by the process of blow pipe Used for special articles

10. SHEET GLASS Made by blowing molten glass in to a large hollow cylinder which is split longitudinally and then flattened over a plane disc. Used for all engineering purposes.

11. PLATE GLASS Very strong and more transparent Made by pouring hot glass on casting table by process of grinding , smoothing and polishing. Used for looking glass, large paned glass for glazing of shop front , wind screen of vehicles.

12. PERFORATED GLASS Made with the help of projections attached to rollers. Used for panels in ventilators

13. FLUTED OR RIBBED GLASS Corrugations on both sides Variety of obscure glass Used for securing privacy without obstructing the light of the sun

14. WIRED GLASS Wired mesh is put in the glass while rolling during manufacture of glass which keeps the pieces of glass held together. Do not shatter into pieces. Used for fire resisting doors and windows.

15. SHIEIDING GLASS Variety of polish lead glass Contain lead oxide as one of the elements Used for windows through which high radiations are to be observed.

16. SAFETY GLASS A celluloid sheet is put between two sheets of plate glass and formed in to one unit . Celluloid sheet prevents shattering of splinters when glass breaks.

17. BULLET PROOF GLASS Do not allow bullet to pierce through it. Made by sand witching vinyl-resin plastic between several layers of plate glass. Thickness of glass vary from 15mm to 75mm or even more. Used for glazing bank tellers booths and cash booths, jewellery stores, display cases

18. CALOREX Also known as excluding glass Heat exclusion property Opaque to ultra – violet light Used in factories, hospitals, kitchen etc.

19. INSULATING GLASS Very high resistance to heat flow Provide insulating effect It is made of two or more plates of glass separated by 6mm to13mm of dehydrated captive air. Edges are sealed of the glass.

20. ULTRA – VIOLET RAY GLASS Made of raw mixture of iron titanium and chrome. Can transmit 75% of ultra – violet radiation more than common glass. Widely used in window pane.

21. LAMINATED GLASS When breaks , does not fly off in splinters. Two or more sheets of glass are attached with plastic resin between them. Ensures safety at places where glass is liable to shatter.

22. FIBRE GLASS Soft to touch and flexible in nature. Made of minute glass rod . Developed in in the form of continuous strands or in staple form. Used for chairs, roofs.

23. GROUND GLASS OR OBSURED GLASS Made by grinding one side of the glass or melting powdered glass upon it. Used where light is required without transparency therefore useful for public toilet, office doors, partition etc.

24. TEMPERED PLATE GLASS Much stronger than ordinary glass Made by glass plate which is heated then cooled to temper it immediately. Used for glazed entrance doors, making table tops, shelves, counters etc.

25. SOLUBLE GLASS Soluble in water Made by melting quartz sand, grinding and mixing it with soda ash, sodium sulphate or potassium carbonate. Used for making acid – resistant cement.

26. FOAM GLASS Can be cut like wood Floats in water Fire proof, ,rigid and excellent heat insulator. Glass and carbon are finely ground and mixture of both melted in a furnace then takes the form of a block foam.

27. GLASS WOOL It is available in loose fibers, quilts, mats, rigid ir semi rigid slabs. Thin fibers of glass which are flexible and have high tensile strength are spun out of molten glass. Used as filter in air conditioners for electric insulation , for filtration of corrosive liquids.

28. GLASS BLOCKS Hollow transparent units, made by fusing together two pressed semi – blocks. S izes – 10cm thick and 15cm, 20cm, 30cm square Sealed edges with grit bearing plastic so that a good bond is provided with mortar. Used in the construction of non- load bearing external panel walls and partition walls, skylights, insulation.

29. THANK YOU MANISHA AGARWAL