High-Strength Aluminum Alloy Structure Spiral High Speed Door Our High-Strength Aluminum Alloy Structure Spiral High Speed Door is built for demanding industrial openings where structural rigidity matters. The door body combines an aluminum alloy outer skin of 0.7mm thickness with a high-density polyurethane core, forming a rigid panel structure that resists impact, deformation and daily wear. Unlike soft curtain doors, this rigid aluminum alloy structure provides excellent