[A2_start]This British Standard specifies requirements for the materials and performance of a water‑resistant, two pack pretreatment etch primer for aerospace applications, including specific reference to the use of two Chromium (VI) substances (see 4.1.2).[A2_end]

The pretreatment etch primer is for use on metallic substrates to provide adhesion for an anti-corrosive primer and finishing scheme.

Information on application for type approval is provided in Annex A.