Founded in 1997, Histrong is a professional manufacturer of rigid core & vinyl building materials, specializing in PVC soffit panels for indoor & outdoor wall and ceiling decorationMade-in-Ch.... With over 90% PVC content, our panels feature 0.9–8mm adjustable thickness and customizable lengths. They meet Class B1 fire resistance with oxygen index above 35%, thermal shrinkage below 0.3%, and pass 1200h UV aging test; water absorption is under 15%, reaching IPX4 waterproof grade, while the NRC sound absorption coefficient hits 0.65 to cut ambient noise by 25%-30%Alibaba.co.... We supply V-slot, U-slot, multi-column profiles & full accessories, certified by IAF, CNAS, RoHS and CE. Flexible for B2B, ODM and OEM orders, realistic wood grain finishes perform stably in humid bathrooms, open patios and exterior facades, delivering durable decorative solutions globally.