Immersion type heat exchanger

摘要

The present invention provides a heat exchanger having a coating with durability which causes neither adhesion of sludge nor separation of the coating within a short time. The surface of the heat exchanger is coated with a fluororesin having excellent chemical resistance and characteristics in that the hardness is R96 or more, the taper abrasion is less than 8.7 mg, the linear expansion coefficient is 7.5 to 8.0x10-5/ DEG C., and the elongation is 223 to 280%. The fluororesin is preferably poly chloro tri fluoro ethylene with 1-2 weight percent cobalt.