Spotcheck skd, S2 non, Chlorinated solvent developer spotcheck skd, S2 is a non, Chlorinated solvent developer that meets major requirements for special alloy and nuclear applications. Spotcheck comes fully prepared for immediate use suspension of white developing particles in a fast drying solvent. It produces an opaque white coating, Which delivers outstanding contrasting background for penetrant indications. Skd, S2 is specially formulated to be low in sulfur and halogens and contains no chlorinated hydrocarbontypical propertiesskd, S2flash point2 f pmcc density7. 3 lbs/gal 875g/l corrosionnon, Corrosivecoatingwhite, Opaque filmsulfur contentless than 1000 ppmchlorine contentless than 1000 ppmclassificationform d and form etemperature40 f to 215