Chiguard® W-5491
High-Efficiency Waterborne UV Stabilizer —
Advanced Protection for Wood Coatings
Specifically designed for outdoor wood coatings – A simplified formula that delivers exceptional protection
Introduction
Ultraviolet rays in sunlight are the main culprit behind the aging of outdoor wood. They cause fading, yellowing, and structural degradation, significantly shortening the wood’s service life.
Chiguard® W-5491 (W-5491 for short) is a high-performance UV stabilizer developed precisely to address this issue. It offers comprehensive protection with a simplified formulation – effectively extending wood color longevity and enhancing weather stability, providing an upgraded and long-lasting solution for waterborne outdoor wood coatings.
Why Choose W-5491?
Born for Outdoor Wood – Professional Grade Weather Resistance
Outdoor wood, when exposed to sunlight over time, is highly vulnerable to UV damage. The lignin in wood is especially sensitive to UV rays, often resulting in yellowing, brittleness, and surface degradation – all of which impact the appearance and durability of the wood.
Chiguard® W-5491 is tailor-made for this challenge. Utilizing red-shifted UV absorption technology, it effectively blocks high-energy UV rays and slows down the photodegradation process, offering long-term protection for wood coatings.
To verify its weathering performance, a series of xenon lamp aging tests were conducted to simulate prolonged outdoor exposure, observing discoloration and degradation of the wood coating films from 72 hours up to 1500 hours of continuous UV exposure.
Test results demonstrate W-5491’s superior stability.
After 1152 hours of continuous UV exposure, the ΔE (color difference) was only 9.57 – outperforming other test groups. It effectively suppresses yellowing and preserves the wood’s original color and grain.
W-5491 delivers high performance as a single additive, with no need for HALS or multiple-component combinations – enabling a simpler formulation with better results.
Technical Highlights | Simplified Formula × Stronger Performance
Specially developed for waterborne outdoor wood coatings, W-5491 offers efficient protection and user-friendly application with a single additive – making it easy to build a high-durability, high-quality wood coating system.
✅ Ultra-low emulsifier content – minimizes foaming issues during application
✅ Fast resin compatibility
✅ Solvent-free and co-solvent-free – process-friendly
✅ No negative impact on coating flow properties
✅ Red-shifted UV absorption – upgraded weatherability for outdoor wood
Recommended Applications
From design-forward outdoor furniture to weather-resistant architectural wood cladding, W-5491 delivers excellent compatibility and performance:
- Outdoor Wood Coatings | Boardwalks, Outdoor Furniture, Architectural Wood Siding
- High-End Waterborne Wood Systems | Suitable for both transparent and semi-transparent finishes
- Weather-Resistant and Eco-Friendly Projects | Balancing performance and sustainability
