Donghongchang Tonghui Waterproof Technology Co., Ltd. covers an area of 40000 square meters and currently has multiple modern production lines. It can produce "Hongchang", "Hongchang Huitong", and "JindekeTM" brand elastic/plastic modified asphalt waterproof rolls, polyvinyl chloride PVC (self-adhesive) waterproof rolls/internally reinforced PVC (self-adhesive) waterproof rolls, polymer polyethylene propylene (polyester) (self-adhesive) waterproof rolls, self-adhesive polymer modified asphalt waterproof rolls CPS-CL reaction bonded polymer wet laid waterproofing membrane, polymer self-adhesive waterproofing membrane, APF self-adhesive membrane, BAC self-adhesive waterproofing membrane, wide width tunnel high-speed railway special EVA (self-adhesive) waterproofing board, tunnel high-speed railway special chlorinated polyethylene CPE (self-adhesive) waterproofing membrane, thermoplastic polyolefin (TPO) waterproofing membrane, polymer EPDM rubber waterproofing membrane, polyethylene geomembrane, geotextile, root puncture resistant waterproofing membrane for planting roofs, colored asphalt tiles, spray polyurea elastomer waterproofing coating, high-speed railway special polyurethane waterproofing coating, cement-based (JS, K11) polymer elastic waterproofing coating, 951 polyurethane waterproofing coating and other products. It is a professional waterproof material production enterprise integrating production, scientific research, construction, and sales. The company is a member of the Shouguang Waterproof Industry Association and has passed the lS014001-2004 international environmental management system certification. It has also obtained certificates such as the Industrial Product Production License issued by the General Administration of Quality Supervision, Inspection and Quarantine, the Shandong Province Plastic Industry Quality Trustworthy Unit, and the Shouguang City Waterproof Industry Famous Unit. The company has advanced testing instruments, and all testing personnel have received formal training from the National Building Materials Inspection and Testing Center before taking up their posts. From raw material entry, production process, finished product inspection and storage, to product delivery, the company conducts strict checks, batch inspections, and random spot checks in accordance with national waterproof quality standards, achieving a high pass rate upon leaving the factory. The company complies with national industrial policies, adopts modern management mechanisms, takes "unity, pragmatism, integrity, and innovation" as the core concept of the enterprise, provides excellent products and services as the enterprise purpose, and takes "customer satisfaction" as the work standard of the enterprise. We are willing to cooperate sincerely with friends from all walks of life and create brilliance together. Hongchang people warmly welcome friends from all walks of life with excellent product quality and excellent service.