This British Standard specifies requirements for the materials and performance of a pre‑treatment primer for aerospace, defence and other applications. The pre-treatment primer is for use on metallic substrates to provide adhesion for an anti-corrosive primer and finishing scheme.

This British Standard specifies requirements for a pre-treatment primer that can be used with British Standard X series primer and/or finishing schemes, or in combination with other finish schemes as required.

This British Standard is intended to be a Chromium(VI)-free alternative to BS X 32 and as such, is to be considered appropriate for products that can be described as thin-film/etch/ wash primers.