Sherwin D-350 High Temperature Developer Sherwin Incorporated| 12398 Sherwin D-350 High Temperature Developer Print Sherwin Incorporated| 12398 Sherwin D-350 High Temperature Developer High temperature developer used to enhance penetrant indications on parts at temperatures up to 350ºF (177ºC). Complies with low sulfur and low halogen requirements. See also Sherwin KO-17 and Sherwin KO-19. Options: D-350: Sherwin D-350, 16oz (473ml) aerosol can (case of 9). D-350-1GAL: Sherwin D-350, 1gal (3.78L) jug. D-350-5GAL: Sherwin D-350, 5gal (18.9L) pail. Request for information