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Arrange the steps in sequence for the manufacture of borosilicate glass. (a) Addition of ingredients like red lead, aluminium oxide, manganese oxide, chromium oxide etc. (b)Addition of broken pieces of glass (c)Mixing up of sand, limestone, sodium carbonate, aluminium oxide and borax in required proportion (d)Melting mixture in a glass tank furnace or pot furnace (e ) Annealing process (f) Blowing of glassA. cbadfeB. cbafedC. cdbafeD. cfebad

Answer» Correct Answer - A
(i) Mixing up of sand, limestone, sodium carbonate, aluminium oxide and borax in required proportion.
(ii) addition of broken pieces of glass
(iii) Addition of ingredients like red lead, aluminium oxide, manganes oxide, chrominum oxide etc.
(iv) Melting mixture in a glass tank furnace or pot furnace.
(v) Blowing of glass
(vi) Annealing process


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