Tru Temp® Stainless Black Oxide for stainless steel forms a black magnetite finish when applied on any stainless steel parts. The Tru Temp Stainless process operates effectively at 200° to 210° F, much lower than traditional hot black oxide at 250-260° F. The result is a protective black finish - 0.000020" (1 micron) thick, with an attractive satin black appearance equal to that of hot black oxide. This robust coating is MIL-DTL-13924 Class 4 compliant.
For manual, brush-on or sprayer application such as architectural finishing, antique sculpture work or scratch repair work, Presto Black® SSB is applied using a brush-on applicator technique or for larger surface areas a pump sprayer can be deployed. All workpieces must be thoroughly cleaned of oil and excess scale before blackening. Reaction stop is also necessary and facilitated with a water rinse and forced air drying with compressed air, and then a final top coat sealant should be applied. Multiple applications of black oxide for stainless steel may be required to achieve the desired grey/black finish.