Coatings for Iron and Steel - Tru Temp®

High Quality Blackening without Salt Bloom!

Black Oxide PartsOrdinary hot black oxide bath is very viscous and difficult to rinse off. Blind holes and recessed areas often form white salt blooms which destroy the value of the finished part and upset customers! Because the Tru Temp Mid-Temperature Black Oxide solution is much milder and cooler, it rinses freely. White salt blooms are a thing of the past! Castings and powdered metals turn out a rich black. Note that the Tru Temp black finish complies with MIL-C-13924C, Class 1 and is corrosion resistant. It withstands 100-300 hours salt spray, depending on the sealant used. Tru Temp® Examples


Tru Temp Black Oxide on Powdered Metal

Tru Temp Mid-Temperature Black Oxide
No Salt Bloom on Powdered Metal

Hot Black Oxide with Considerable Salt Bloom

Hot Black Oxide
Considerable Salt Bloom


Tru Temp Black Oxide with No Salt Bloom

Tru Temp Mid-Temperature Black Oxide
No Salt Bloom

Hot Black Oxide Considerable Salt Bloom in Recesses

Hot Black Oxide
Considerable Salt Bloom in Recesses