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An economical high-temperature unit for quartz glass test melts was created based on a vacuum resistance furnace. To update the melting chamber of the standard furnace, a heating unit with a working temperature of up to 2200°C was developed and manufactured; it consists of a tungsten heater and molybdenum heat shields which allow melting small blocks of quartz glass. The updated furnace is used to evaluate the technological properties of natural quartz from different deposits.

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