... ,etc. 2,the total thickness of plating rayer reachs to 12um.Multi-rayer precious platings with supper corrosion resistance and shining ... permanently(cooper 7-8um, Ni 4-8um,cr: 0.25um) 3,faucet corrosion test:NSS/ASS 24hours/48hours,corrosion status ... Plating layer: cooper 7-8um, Ni 4-8um,cr: 0.25um Noise level:19 db(a) at 3 bar with filter ...