According to Birchwood Technologies (Eden Prairie, MN), manufacturers evaluating taking Black Oxide finishing in-house now have a low cost and safe entry option with the BC40 Presto Black finishing system. The seven-tank process line, with 20 minute room temperature blackening capabilities, comes complete with tank system, heaters, plumbing connections and tank lids. According to the company, adding a Birchwood Technologies preconfigured Ion Exchange system to purify and recycle rinse waters makes a closed-loop, zero-discharge operation and eliminates environmental concerns. Features include:
- Pre-engineering to enable quick setup and safe operation.
- Seven individual tanks, each measuring 16 x 24 x 24 inches deep (ID), while occupying a footprint of just 3 x 15 feet. The tanks are rugged and virtually unbreakable, manufactured of heavy weight, high-density polypropylene and polyethylene.
- The ability to produce high quality satin black finishes and can often be operated by workers in adjoining machining cells, without adding new employees.
With a uniform .000030 inch (1 micron) thickness, the porous crystalline structure of the black finish makes it an excellent absorbent base for a rust preventive top coat. Once sealed, the Presto Black finish resists up to 1,200 hours humidity without chipping or peeling.