| Standard Specification for Autocatalytic (Electroless) Nickel-Phosphorous Coatings on Metal | ASTM B-733 | |
| 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 |