Dual seal skirt board has a double layer of skirting rubber compound from pu and rubber. The inner wear resistant of polyurethane exceeds the wear life of traditional rubber on skirting, whilst outer anti-dust integral molding can adapt to belt vibration and maintain the correct pressure to effectively seal the belt. Double layer structure, inside layer keeps materials, outside layer prevent dust-leakage.Clamp units are easy to install, adjust and maintain.