ASTM B-733

Standard Specification for Autocatalytic (Electroless) Nickel-Phosphorous Coatings on Metal
Deposit alloy types Phosphorus % wt  
I No requirement for Phosphorus  
II 1 to 3  
III 2 to 4  
IV 5 to 9  
V 10 and above  
Service Condition Minimum coating thickness specification Minimum thickness, um
SC0 Minimum thickness 0.1
SC1 Light Service 5
SC2 Mild Service 13
SC3 Moderate Service 25
SC4 Severe Service 75