Bare Epoxy (BE)
Bare or Raw Epoxy
has slightly better scratch resistance and was designed specifically for applications where the magnet requires an excellent adhesion to epoxy glue.
Black Epoxy (Ni-Cu-BE)
Black Epoxy
has low abrasion resistance but is excellent for indoor/outdoor use as long as there are no harsh mechanical conditions. The plating consists of 3 layers Nickel, Copper, and Epoxy scratches the most easily of all coatings.
Casing Collar Locators (CCL):
Casing Collar Locators (CCL)
is a magnetic downhole device that is used to detect changes in metal thickness to confirm or correlate treatment depth using known reference points on the casing string. It is mainly used for depth control and depth correlation.
Chemical Nickel (Ni-Cu-Ni-ChNi)
Chemical Nickel
is a significantly improved coating over standard Nickel Plating, but costs about 3x the price. Typically, that increase in the coating cost is negligible in the overall cost of larger magnets.
Corrosion Monitoring
Corrosion monitoring
tools are used to detect and monitor the presence of corrosion or metal loss within.