Birchwood Technologies (Eden Prairie, MN) offers three mini systems for use in small batch metal finishing at low temperatures. Mini systems are for manufacturers looking to add in house capabilities without the necessary volume or space for a full sized process line.The Presto Black and Tru Temp processes are for iron and steel parts, and the Lumiclad process for aluminum parts. The cold Presto Black process forms a non-dimensional coating thickness of less than 0.5 micron thickness and offers a short fifteen-minute process that provides high corrosion resistance. It has been tested for up to 800 hours humidity exposure when sealed with an appropriate rust preventive. It offers a friable crystal structure that serves as a sacrificial barrier on sliding surfaces to protect the underlying steel itself from galling and deformation. The low temperature Tru Temp process forms a durable satin black magnetite coating, 0.5 micron thick, with no effect on material hardness or tensile strength. The sealed finish withstands up to 100 hours of neutral salt spray or several hundred hours of humidity, and protects the metal surface during shipment & storage as well as in service. Tru Temp black oxide operates effectively with alkaline chemistry that does not embrittle metal or create unsightly salt bloom in and around recessed part areas. The Lumiclad process forms a non-dimensional black oxide finish on all aluminum surfaces that is durable, clean and tightly adherent to the metal substrate. The process develops a uniform coating thickness of 1.5 microns that will not close down hole diameters or change critical part dimensions. The smooth black finish has a slightly porous crystal structure that absorbs an optional topcoat such as a dry-to-touch sealant, light oil, or clear polymer.