CTL's Coating Processes & Specifications Industrial and Aerospace Metal Finishes Electroless Nickel / PTFE AMS 2454 GPS 3117-1 M7019883 HP4-90 EMS 52545 P.S. 10-27 70B995447 NP3 AMS 2454 GPS 3117-1 M7019883 HP4-90 EMS 52545 P.S. 10-27 70B995447 Electroless Nickel Plating AMS 2404 MIL-C-26074 AMS-C-26074 ASTM B733 GPS 3108-1 M695215 HP4-10 Gold Plating MIL-DTL-45204 ASTM-B488 Black Oxide AMS 2485 MIL-DTL-13924; Class 1, Class 4 M690330 HP4-50; Class 1, Class 4 EPB4-230 FINISH 33, 42 MIL-STD-171 Finish No.: 3.3.1; 3.3.4 Zinc & Manganese Phosphate MIL-DTL-16232 MIL-STD-171 FINISH 5.3.1 AND 5.3.2 HP4-7 EPB4-230 FINISH 29, 30, 31, 32 Passivation of Stainless Steel AMS 2700 AMS-QQ-P-35 QQ-P-35 ASTM A967/967M-17 ASTM A380/A380M-17 GPS3000-1 Thermal Treatment Blast Finishing