UV Radiation Physics: How Windows Stop the Photodegradation of Hardwood & Art

## The Photochemistry of Interior Solar Fading Homeowners frequently notice bleached patches on expensive hardwood flooring, faded Persian rugs, and cracked leather couches situated near sunny windows. This degradation is caused by photochemical reactions driven by solar radiation. ### The Fading Spectrum: 1. **Ultraviolet (UV) Radiation (300–380 nm):** High-energy photons that cleave chemical bonds in dye chromophores (accounts for ~40% of fading). 2. **Visible Light (380–780 nm):** High-intensity natural light causing optical excitation and pigment fading (~25% of fading). 3. **Solar Infrared Heat (780–2500 nm):** Accelerates chemical oxidation and dries out wood finishes (~25% of fading). 4. **Indoor Environmental Factors:** Humidity and airborne pollutants (~10%). ### How Modern Glazing Protects Your Interiors: Standard clear glass blocks only UV-B, transmitting over 70% of damaging UV-A. Modern spectrally selective Low-E coatings and laminated PVB interlayers absorb and reflect over **99% of UV radiation**, protecting your home furnishings for decades. Connect with ServiceFind Windows Pro for UV-blocking window upgrades and a **Fair Quote**.