Tianjin Haimen Building Materials Co., Ltd. is located in Tanggu National Marine High-Tech Development Area, Tianjin. Its product trademark is registered as "Haimen". It is mainly engaged in producing and selling high-density and lower pressure polyethylene outer tube, polyurethane prefabricated and direct-buried insulating pipe, mineral wool product, glass wool product and ceramic fiber product. The company won certificate of ISO90001 quality management system in 2003 and established a strict quality assurance system. Its mineral wool products have gained approval of European Community (EC), American Bureau of Shipping (ABS), Germanischer Lloyd (GL), Lloyds Register (LR), Bureau Veritas (BV) and China Classification Society (CCS). Its ceramic fiber products have passed test of A-60 class fire-resistant ship deck and separating test of A-60 class fire-resisting bulkhead. Direct-buried insulating pipe can meet not only CJ/114-2000 standards of the National Construction Ministry but also European EN253:1994 standard.