Zhejiang Four Brothers Rope Co., Ltd.

Synthetic fiber rope manufacturing and application engineering have defined Zhejiang Four Brothers Rope Co., Ltd. since 1958. The company produces mooring ropes, towing ropes, fishing and aquaculture lines, single point mooring hawsers, and synthetic slings for heavy lifting. Its offshore portfolio includes polyester and HMPE mooring systems for deepwater platforms, FPSOs, floating wind structures, tanker operations, subsea installation, and marine construction. Fisheries products use polypropylene, polyethylene, nylon, polyester, and HMPE in braided and stranded constructions selected for strength, buoyancy, flexibility, fatigue resistance, and abrasion performance in saltwater environments.

Manufacturing operations are supported by more than 300 skilled technicians, over 500 equipment sets, and annual capacity exceeding 35,000 tons. Research, development, and validation capabilities include a 2,500 ton tensile testing system, environmental simulation, fiber selection, structural design, prototype development, and testing for specific loads and operating conditions. The company reports more than 50 global patents and management systems certified to ISO 9001, ISO 14001, and ISO 45001, alongside approvals and compliance associated with major classification societies and OCIMF MEG4. Its engineering work extends beyond marine operations to bridge protection, river engineering, floating bridges, industrial lifting, and other infrastructure or safety projects. A digital line management system also integrates rope identification, inspection records, and operating data to assist maritime operators with traceability, maintenance planning, and service life management.