国产av无码专区亚洲av毛片

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Single face tempered glass

2016-04-15 09:43:43   Source:   Click times:
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Single face tempered glass:
Glass in the furnace heated to near the softening temperature when glass in stick flow state, thermal insulation for a period of time, then the film glass quickly into the cooling device, with low temperature and high speed airflow of homogeneous glass quenching, the inner layer of glass tensile stress is generated, outer surface compressive stress, after the glass is tempered glass.
国产av无码专区亚洲av毛片