Hebei Rongyan Building Materials Co., Ltd., mainly engaged in UPVC sheet / pipe fittings / elbow tee, is a new technology and new material enterprise specializing in providing color shell non-metallic composite thermal insulation and external protection products ( bright, clean, weather-resistant, corrosion-resistant and flame retardant ), is a resource-saving and environment-friendly service-oriented enterprise, and is an enterprise providing high-quality thermal insulation and external protection products for thermal insulation systems O