EN 927-6: Accelerated Weathering Standards
EN 927-6 – Artificial Weathering of Wood Coatings Using Xenon Arc Radiation
Exterior wood coatings are constantly exposed to sunlight, moisture, and temperature changes. Over time, this can lead to fading, cracking, loss of adhesion, and early coating failure.
For manufacturers and specifiers, predicting how a wood coating will perform outdoors is essential, but natural exposure testing is slow and unpredictable.
EN 927-6 testing provides a controlled, accelerated method to assess how wood coatings respond to realistic sunlight and weather exposure, helping you make confident durability and performance decisions earlier in the product lifecycle.
What EN 927-6 Testing Involves
EN 927-6 is part of the EN 927 series for paints and varnishes for exterior wood. It specifies a method for artificial weathering of coated wood panels using filtered xenon arc radiation.
The test simulates natural outdoor exposure by combining:
- Full-spectrum light including UV, visible, and infrared radiation
- Controlled moisture exposure
- Defined temperature conditions
It allows evaluation of visual and physical changes in wood coatings under accelerated ageing conditions.
Methodology
At Impact Solutions, EN 927-6 testing is performed using xenon arc weathering chambers configured to meet the requirements of the standard.
A typical EN 927-6 test programme includes:
- Preparation of wood substrates and application of the coating system according to specification.
- Conditioning and mounting of coated panels in the test chamber.
- Exposure to xenon arc light using appropriate optical filters.
- Controlled moisture cycles, such as water spray or humidity phases.
- Periodic inspection for changes including colour, cracking, flaking, blistering, and adhesion loss.
- Final evaluation and reporting with photographic documentation.
Exposure durations are selected based on product type and expected service conditions.
Relevant Industry Applications
EN 927-6 testing is commonly used for:
- Exterior wood coatings and stains
- Architectural timber finishes
- Window, door, and cladding coatings
- Decking and fencing systems
- Joinery and construction products
- Product development and benchmarking
Benefits of EN 927-6 Testing
- Simulates realistic outdoor sunlight exposure for wood coatings
- Helps predict long-term appearance and durability
- Supports comparison of coating systems and formulations
- Reduces risk of premature coating failure in service
- Provides repeatable and standardised test conditions
- Supports compliance with European performance specifications
FAQ
Q: How does EN 927-6 differ from natural weathering tests?
EN 927-6 accelerates exposure using controlled xenon arc light and moisture, providing faster and more repeatable results than outdoor testing.
Q: Is EN 927-6 suitable for all wood species?
The standard can be applied to a range of wood substrates, but species selection should reflect the intended end use.
Q: Does EN 927-6 replace field exposure testing?
It does not replace natural exposure entirely, but it provides valuable accelerated data for comparative and predictive assessment.
Want to verify your coating's durability before it reaches the field?
Contact Impact Solutions to discuss EN 927-6 testing and how we can help you demonstrate proven weathering performance.
