Published: 2026-08-28
Product Introduction
Shanghai Suoqi Electric Wire & Cable Co., Ltd. has launched a series of seawater-resistant cables for the marine engineering sector, specifically designed for harsh conditions such as seawater immersion, salt spray corrosion, and underwater dynamic laying and retrieval. The products cover various applications including underwater power supply, signal feedback, and video transmission, and can be used for power and signal connections in equipment such as port machinery, aquaculture, marine monitoring, offshore wind power, and underwater robots. The cables use a polyurethane (PUR) sheath as the core protection, combined with tinned copper conductors, composite shielding layers, and Kevlar tensile structures, achieving a balance between seawater corrosion resistance and mechanical reliability. Non-standard customization is supported based on laying depth, number of cores, cross-section, and length.
Operating Condition Pain Point Analysis
Seawater environmental damage to cables mainly manifests in three aspects. First, chloride ion penetration corrosion. Seawater salinity is about 3.5%, and chloride ions slowly seep through the sheath's micropores, causing electrochemical corrosion with copper conductors, causing conductor blackening and increased resistance, ultimately causing power interruptions or signal drift; If the sheath is soaked for a long time, ordinary PVC materials may harden and crack due to the release of plasticizers. Second, underwater dynamic mechanical stress. Reel retraction, draging, and wave impact cause cables to repeatedly bend, stretch, and twist, making ordinary cables prone to core breakage and sheath tearing, shortening equipment maintenance cycles. Third, temperature differences and microbial corrosion. Large day-night temperature differences in shallow coastal waters and acidic metabolites produced by marine organisms accelerate sheath aging. These pain points require targeted design in cable material selection and cable manufacturing processes, rather than simply thickening the sheath.
Product Technology Analysis
From the perspective of raw material selection, the conductor is made of multiple strands of fine tinned copper wire twisted together. The tin plating forms a dense protective layer on the surface of the conductor, preventing chloride ions from coming into direct contact with the copper substrate, thereby inhibiting electrochemical corrosion from the source. The insulation layer is made of special cross-linked polyethylene or ethylene-propylene rubber, offering excellent water-tree resistance, with insulation resistance decaying slowly even after long-term immersion. The sheath is the first barrier against water and corrosion. This series uses polyether-type polyurethane (PUR), which has more prominent hydrolysis resistance, salt spray resistance, and antimicrobial properties compared to polyester-type PUR. Combined with formula optimization, it can operate in a wide temperature range of -40°C to 105°C, balancing low-temperature flexibility with high-temperature deformation resistance. The shielding layer uses a composite structure of tinned copper wire braid and aluminum foil, with a coverage rate of no less than 85%, effectively suppressing electromagnetic interference from devices such as inverters and motors, ensuring stable transmission of weak signals from encoders and sensors. Kevlar aramid fibers are filled inside the cable core to form a tensile reinforcement layer, sharing the axial tension generated by underwater dragging and reel winding, preventing the conductor from being stretched and deformed.
From the perspective of cable manufacturing processes, the cabling process uses a lay-relief stranding technique, which releases residual internal stress in the cable cores during stranding, preventing the cable from twisting or tangling during winding and unwinding, and significantly improving dynamic service life. The cabling pitch of the cores is calculated and matched to ensure even stress distribution in multi-core structures, with controllable core displacement during bending. The sheath extrusion uses a double-layer co-extrusion process, with the inner layer ensuring electrical sealing and the outer layer providing wear protection; the layers are tightly bonded, reducing bubble and impurity defects. For deep-water scenarios, a longitudinal water-blocking structure can be added, filling the gaps between cores with water-blocking material to prevent moisture from migrating along the cores, meeting the requirements for long-term underwater immersion.
Applicable scenarios
Port Terminal: Reel power supply for equipment such as gantry cranes and ship unloaders
Aquaculture: Power and signal connections for oxygenators, feeders, and underwater monitoring
Ocean Monitoring: Power Supply and Data Transmission for Hydrological Buoys and Underwater Observation Stations
Offshore Wind Power: Salt Spray Resistant Wiring for Tower Interior and Platform Auxiliary Equipment
Underwater Robot (ROV): Umbilical Cable Assisted Power Supply and Video Signal Transmission
Shipbuilding and repair: Temporary power supply and communication for docks and outfitting piers
Core Product Advantages
Salt spray corrosion resistance: Polyether PUR sheath combined with tin-plated copper conductors can withstand salt spray tests for over 1000 hours
Wide temperature range applicable: -40°C~105°C, suitable for different temperature differences from shallow sea to nearshore
Tensile and bending resistance: Kevlar tensile layer is twisted and reared into cables, suitable for retracting and underwater drag
Anti-interference transmission: composite shielding structure ensures stable video and encoder signals
Non-standard customization: supports customization by laying depth, core count, cross-section, and length, supplied directly from the source factory
A brief introduction to e-commerce
Shanghai Suoqi seawater protection cable, specially designed for marine environments. Polyether PUR sheath is resistant to salt spray corrosion, tin-plated copper conductors are resistant to chloride ion corrosion, Kevlar tensile and twist-release cables adapt to reel reeling, composite shielding ensures signal stability, temperature resistance -40°C~105°C. Suitable for ports, aquaculture, marine monitoring, ROV, and other scenarios, supports non-standard customization, direct supply from the source manufacturer, welcome to call for detailed 13311756197.
About Shanghai Suoqi
Shanghai Suoqi Electric Wire & Cable Co., Ltd. is a specialized cable enterprise focusing on the research and development, design, production, and sales of special flexible cables. The company's products cover a series including reel cables, flat cables, drag chain cables, encoder cables, polyurethane cables, seawater-resistant cables, seawater-resistant network cables, and high-altitude vehicle cables, which are widely used in ports machinery, mining, industrial automation, marine engineering, and other fields. For more product information or inquiries, please call 13311756197 (same number on WeChat).