| Electroless depostion of Nickel-Phosphorous Alloy coatings on metal and composit surfaces | Mil-C-26074E | |
| Class 1 | As plated, no subsequent heat treatment | |
| Class 2 | Heat treated to obtain required hardness | |
| Class 3 | Aluminum alloys nonheat-treatable, processed to improve adhesion of deposit | |
| Class 4 | Aluminum alloys, heat-treatable, processed to improve adhesion of deposit | |
| . | ||
| Thickness | ||
| Grade A | .0010 inch minimum | |
| Grade B | .0005 inch minimum | |
| Grade C | .0015 inch minimum. | |