BONDERITE C-AK 4215NC AERO Metal pre-treatment mixture developed to clean aerospace metals, including metals that come into contact with LOX. BONDERITE® C-AK 4215NC AERO is a white, granular powdered metal pre-treatment mixture developed to clean aerospace metals, including metals that come into contact with LOX. It is ideal for cleaning fuel and hydraulic components and articles that require adhesive bonding, anodizing and conversion coatings. Its normal operating temperature is from +140 °F to +158 °F (+60 °C to +70 °C).