ICS 87.040                          CHD 20

Reaffirmed 2022

1. Scope

1.1 This standard prescribes requirements and methods of sampling and test for two pack polyurethane primer, zinc phosphate intended to be used for the protection of exterior of railway coaches, diesel and electric locomotives, against atmospheric corrosion.

1.1.1 It is primarily suitable for application by spraying. It may, however, be applied by brush for touching up small area.

1.1.2 The material is intended to be used as an anticorrosive primer in polyurethane paint system over grit or sand blasted, to minimum Sa 2.5 to ISO 8501-1 : 2007 ‘Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings’, exterior steel surfaces of railway coaches, etc. The material shall have good adhesion on the substrate and shall have good compatibility with the two pack unsaturated polyester base or polyurethane base knifing filler, two pack polyurethane surfacer and two pack polyurethane enamel.

NOTE - Profile should be restricted to 50 microns. If it exceeds 50 microns, the dry film thickness of paint system should be at least three times the profile.

2. Referenced

The standards listed in Annex A contain provisions which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated in Annex A.