Device to establish drying conditions for protective coatings at elevated temperatures

An apparatus has been described for determining the drying time of protective coatings at elevated temperatures, and tests have been made with vinyl ether formulations. The device is essentially a miniature Sanderson drying-time meter constructed in an oven where temperatures up to 260°C. can be maintained. Tolerances were made on the order of 0.015 in. for gear clearances and bearing expansion. A special high-temperature grease is the lubricant. Turntables, which make one revolution every 15 min., permit simultaneous evaluation of three films. Reproducible results have been obtained, and uniform conditions apparently prevail throughout the oven.