Room Temperature, 65–85° F

Room-temperature black oxide processes are best for quick, safe, and convenient in-house and even at-home blackening. Use a room-temperature blackening process to give steel parts satiny, grey-black finishes and extra corrosion resistance.

Mid Temperature, 220–255° F

EPi’s mid-temperature black-oxide process, Kool-Blak 225, blackens steel in 30–45 minutes and converts it to black iron oxide magnetite, which provides a glossy black finish as well as protection for the part. Mid-temperature blackening processes offer dimensional stability, smut-free finishes, and high-quality results.

Hot Temperature, 285° F

Hot-temperature black-oxide processes produce glossy black-blue coatings and true black-oxide magnetite finishes in 10–20 minutes. EPi’s line of high-temperature blackeners offers impressive abrasion and corrosion resistance, and several products meet military and AMS specifications.