3. Material Quality The quality of the fiberglass material itself can also affect its corrosion resistance. High-quality fiberglass is typically composed of pure silica sand and is treated with chemical inhibitors to enhance its resistance to corrosion High-quality fiberglass is typically composed of pure silica sand and is treated with chemical inhibitors to enhance its resistance to corrosion High-quality fiberglass is typically composed of pure silica sand and is treated with chemical inhibitors to enhance its resistance to corrosion High-quality fiberglass is typically composed of pure silica sand and is treated with chemical inhibitors to enhance its resistance to corrosionfiberglass duct corrosion resistance. On the other hand, lower-quality fiberglass may contain impurities or lack adequate protection, making it more prone to corrosion.