Class 4Chemically converted (may be dyed to color as specified)With no supplementary coating or coating as specifiedType ZZinc phosphate baseClass 1Supplementary preservative treatment or coating, asspecifiedClass 2Supplementary treatment with preservative conforming toMIL-PRF-1 61 73, Grade 3 or MIL...
Type Z, class 2 coatings shall be treated with corrosion preventative conforming to MIL-L-3150 or Grade 3 of MIL-PRF-16173. Unless otherwise approved (see 6.2), the weight per unit area of corrosion preventive shall be such that items shall show no signs of corrosion when subjected to ...