Hi, Can anyone tell me which official standards apply to the 3 following areas?: 1/ Acceptable cleanliness level of bare pcbs direct from the manufacturer. 2/ Acceptable cleanliness level of finished PCB assemblies. (I am looking for data concerning the maximum ugNaCl / sq.cm allowed.) 3/ Conformal coating of PCB Assemblies. Thanks Ben Hammond Ben HAMMOND PCB Product Engineer Manufacturing Engineering Dept. Langer Road, Felixstowe, Suffolk IP11 8ER, England. Tel.: (+44) (0)1394 275842 Direct Line: (+44) (0)1394 694026 Facsimile: (+44) (0)1394 694319 email: [log in to unmask]