For accurate results,maintaining the temperature of hot water, used in thermal shock tests, at a constant temperature of 90°F above incoming cold water. The cold water varies from 50°F to 80°F. From the daily production of over one-half million bottles, spot-checks are made by immersing first in hot water for five minutes and then immersing in cold water. Tests determine durability of bottles and their ability to withstand sudden temperature changes. - Two 12 kW Chromalox circulation heaters were installed. Water is pumped constantly through the heaters and the built-in thermostats automatically control the heaters to maintain the preset temperature.

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