A tank, measuring 70 x 40 x 40cm (27.5 x 16 x 16"), fitted with a cover, a controlled heating device and a circulation pump, is used to assess the resistance of coatings, notably to blistering, when immersed in water.

Coated metal sheets are laid at an angle of 15° - 20° on a grooved bottom and fully immersed in deionised water, warmed at 40°± 1°C (104º F ± 2ºF).

Once a predetermined time is reached, the samples are removed and the coating is inspected.

Supplied with an adjustable overheating safety system.