| 1 | They are annealing, normalizing, hardening, and tem- pering. | |
| 2 | For flat glass, heat tempering is most often used. | |
| 3 | This particular oven is used for annealing borosilicate glass. | |
| 4 | And a suggestion was made about proper softening annealing process. | |
| 5 | Most nonferrous metals can be annealed, but never tempered, normalized, or case-hardened. |
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