Discussion
Arrange the stages of glass manufacture in order.
1. fining and conditioning of the melt
2. batch mixing of sand, soda ash and limestone
3. forming and then annealing
4. melting in the furnace
Answer: D
Correct answer: 2 - 4 - 1 - 3
The order follows the material. The batch is weighed and mixed, melted in the furnace, then held while fining removes the bubbles and conditioning brings it to a uniform working temperature. Only then is it formed, and annealing follows immediately to remove the stresses that forming and cooling introduced.
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