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).

The pretreatment etch primer is for use on metallic substrates to provide adhesion for an anti-corrosiveprimer and finishing scheme.Cross References:BS 282; 389:1963BS L 163:1978BS 3900-D5:1995BS 3900: Group EBS 3900: Group G5:1993BS X 33BS 3900: Group GBS EN ISO 2431BS 3900: Part A2:1993DEF STAN 79-15BS EN ISO 1520BS EN ISO 7253BS EN 3665BS X 34BS 2015BS EN ISO 3696 BS EN 2334BS 3900: Group DBS EN 605BS 3900: Part E6:1992 Environmental Protection Act 1990BS 3900: Part D1:1978BS EN 23270 BS EN 29117BS EN 21512BS 3900: Group ABS EN ISO 1513BS 3900: Part H2BS 3900: Group HBS 3900: Part H5BS 3900: Part H4