According to enterprise data, Tangshan Port Datang Tongzhou Building Materials Co., Ltd. was established on 20 1 1-06-23, and its business scope includes the production and sales of autoclaved aerated concrete blocks and fly ash bricks. Building materials (except logs, wood and lime), fly ash, machinery and equipment, Wujinjiaodian and chemical products (excluding inflammable, explosive and dangerous chemicals); Equipment leasing; Technology transfer and technical training (except those prohibited by national laws and regulations and required to operate with a license) (projects subject to approval according to law can only be operated after approval by relevant departments).