What is BS EN 927‑3 - Paints and varnishes - Natural weathering test about?
BS EN 927‑3 is part 3 of a European standard on paints and varnishes that covers coating materials and coating systems for exterior wood.
BS EN 927‑3 specifies a natural weathering test for exterior wood coating systems mainly intended for decoration and protection of planed and sawn wood.
Who is BS EN 927‑3 - Paints and varnishes - Natural weathering test for?
BS EN 927‑3 on Paints and varnishes - Natural weathering test is useful for: 
- Paints and varnishes manufacturers
- Decoration and protection professionals
- Carpenters
Why should you use BS EN 927‑3 - Paints and varnishes - Natural weathering test?
Wood Coatings are basically a kind of material to be applied on wooden surfaces to protect the wood from different natural and manmade factors. Wood coatings make wood easier to clean and keep it sanitized. It also helps in sealing pores that can be breeding grounds for bacteria.
The test method provided in BS EN 927‑3 gives a means of evaluating the performance of a wood coating system during outdoor exposure. It forms the basis for the performance specification in accordance with EN 927-2. It also facilitates the comparison of coating systems performance on different substrates including the wood species, or other wood modifications.
With BS EN 927‑3 helping in performance evaluation, the process of protecting outdoor swan wood can be made considerably easier for you and your organization.
What’s changed since the last update?
BS EN 927‑3:2019 supersedes BS EN 927‑3:2012, which is withdrawn.
BS EN 927‑3:2019 includes some technical changes with respect to BS EN 927‑3:2012. These are:
- The provision for using alternative wood species has been updated
- The Internal Comparison Product (ICP) has been replaced by a nominated reference material as Weathering Reference Material (WRM)
- Mould growth assessment has been extended to visual disfigurement by microorganisms
- New Annex G for typical properties for common wood species was added
- New Annex I for thermal/chemical modification of wood was added
