This Aerospace Recommended Practice sets forth the guidelines for the use of non-black O-ring seals. Black is the preferred color for polymer types other than Silicone and Fluorosilicone. When a color other than black is to be used, those established by this document are the preferred.
National Aerospace and Defense Contractors Accreditation Program (Nadcap) Requirements for Etch Processes (Macrostructure, Nital, Temper, Blue Etch Anodize)
