Chrome-free Passivation for Aluminium The chrome-free conversion coating on aluminium is an environmentally friendly solution, and it provides an excellent base for organic coating. AL 1592 CFP CHROME FREE CONVERSION COATING FOR ALUMINIUM/ALLOY Physical Properties: AL 1592 CFP: Liquid Description AL 1592 CFP is environmental friendly, low-temperature (25 ~ 35°C), chrome-free conversion coating on aluminium materials. AL 1592 CFP can apply either on spray or immersion applications and no rinse needed after treatment. AL 1592 CFP provides an excellent base for organic coating. Equipment Tank: Stainless Steel or PVC lined tankHeating: Stainless steel