What is BS EN 4689 about?
The finish coating over the primer looks good and adds to the longevity of the product. Polyurethane used as the finishing coat provides fuel efficiency in addition to protecting the aircraft.
BS EN 4689 specifies the requirements for a two-components flexible polyurethane topcoat to be applied over chromate and lead-free, and epoxy primers mainly for exterior aerospace applications. The primer and the polyurethane finish tested in BS EN 4689 will be applied in accordance with the manufacturer’s instructions.
Who is BS EN 4689 for?
BS EN 4689 on paints and varnishes for aerospace application is applicable to:
- Polyurethane enamel manufacturers
- Quality control personnel for enamel coatings
- Design engineers for finish coatings
- Quality control personnel for military aircrafts
- Aircraft manufacturers
Why should you use BS EN 4689?
The polyurethane topcoat finish is applied over the primer coatings on the external surface of the aircraft. As a manufacturer of polyurethane coatings, BS EN 4689 guides you to understand and comply with the requirements for the product.
Obtaining BS EN 4689 helps aeroplane manufacturers to make suitable formulations and preparations for the polyurethane finish (as per the specification for aerospace applications, ). Also, manufacturers can demonstrate the reliability of their products and build trust in their use throughout the aerospace supply chain, by adhering to BS EN 4689
