Fourth, quality assurance Hubei AD Building Materials Co., Ltd. has a strict quality control system, and the product manufacturing implements relevant standards. From raw material procurement to production and processing, factory inspection, every process is strictly checked. The product is designed to have a service life of more than 50 years, allowing users to use it worry-free and providing solid and reliable pipeline protection for various projects in Hubei. Contact information: AD Building Materials 17399989993