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In the glass during heating, cooling, mechanical action arising internal stresses.Stresses can be transient and residual. Temporary stresses disappear upon cooling of glass. Residual stresses remain in the glass and significantly reduce their characteristics: sharply reduced the strength of glass products, glass is nenzotropnym, ie, properties in different areas of glass are made by different masses.

In order to eliminate residual stresses applied flashing. Annealing - a special heat treatment of glass product, which consists in heating to a temperature at which the glass particles become mobile, but the glass is not softened, and slowly cooled. Stresses vanish faster than the lower the viscosity of glass.
The whole annealing process is divided into four stages.
The first stage - heating or cooling to the annealing temperature. If the product is at room temperature, then it is gradually heated, and if it is warmed above the annealing temperature of the glass, then it is cooled to a temperature of annealing.
The second stage - conditioning at an annealing temperature of ± (5 ~ 10) ° C until the disappearance of stress. The larger dimensions of the unit and the wall thickness, the longer the extract at a temperature of annealing.
The third stage - the slow-cooling to the lower annealing temperature. The most important thing - cool with a fairly low rate to avoid any new permanent tension.
The upper annealing temperature of molybdenum glass (C49-2) is located at 535-540 ° C, up to this temperature it is heated in the first stage of annealing and maintained; the third stage of this glass is slowly cooled to 410 ° C - the lower the annealing temperature.

Fourth-stage cooling to room temperature. When the temperature falls below the lower annealing temperature stress in a product does not arise, so cool at this stage can take place with a fairly high rate, almost at a rate of cooling of the furnace.
The heating rate in the first stage cooling and the fourth is defined by size and wall thickness products.