I. Natural Phenomenon of Material Aging
The primary reason for yellowing in double-layer glass is the aging of the interlayer material. Common PVB (polyvinyl butyral) or EVA (ethylene vinyl acetate) films undergo oxidation under long-term ultraviolet radiation, gradually yellowing like sunburned skin. This change typically takes 5-10 years to become noticeable, and the higher the temperature, the faster the aging process.
II. Accelerating Effects of Environmental Factors
Pollutants and moisture in the air can seep into the glass interlayer through tiny gaps. Acidic substances such as sulfides in industrial areas and nitrogen oxides in automobile exhaust react chemically with the interlayer film, forming yellow compounds. High salinity in coastal areas also accelerates the corrosion of the metal frame, and rust seeps in, causing yellowing at the glass edges.
III. Misconceptions about Cleaning and Maintenance
Incorrect cleaning methods can exacerbate yellowing. Using overly alkaline cleaners can damage the glass surface coating, and hard scraping tools create micro-scratches that make it easier for dirt to adhere. It is recommended to wipe the surface monthly with a neutral detergent and a soft cloth, and avoid cleaning in direct sunlight to prevent rapid evaporation and water stains.
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