1. Problem: UV Degradation — The Silent Destroyer of Construction Site FIBCs Construction aggregate operations typically store FIBCs outdoors for extended periods — often 4-8 weeks on-site before use. Standard non-UV-stabilized PP fabric loses approximately 40-50% of its tensile strength after 6 weeks of summer sun exposure (cumulative UV dose ~250 MJ/m² at 35°N latitude). This degradation is invisible: photo-oxidation breaks polymer chains at the molecular level while the