Published on:2026-05-24 Click:20
4-core and 2 twisted-pair floating ROV buoyancy control cable. Foamed PUR jacket for positively buoyant ROV tether combining power and signal control channels.
The 4-core + 2-twisted-pair floating ROV cable is designed for ROV buoyancy control and combined power/signal tether applications where the cable must remain positively buoyant at all times. Four cores carry power (thrusters, buoyancy pump/bladder, or electronics supply) while two shielded twisted pairs carry control signals (RS-485, PWM, or analog depth sensor feedback). The positively buoyant foamed PUR jacket keeps the cable floating at the surface, preventing tether entanglement with the ROV. The foamed polyurethane (PUR) jacket uses a micro-cellular expanded jacket compound with a bulk density lower than seawater (~1.025 g/cm³), giving the cable near-zero or positive net buoyancy. This eliminates tether sag and reduces drag force on the ROV, improving vehicle manoeuvrability and reducing tether management workload during subsea operations.
| Parameter | Specification |
|---|---|
| Power/Control Cores | 4 x stranded tinned copper (CSA per spec) |
| Signal Pairs | 2 x twisted pairs (shielded, 24--26AWG) |
| Total Conductors | 8 |
| Jacket | Foamed micro-cellular PUR |
| Buoyancy | Positive -- floats at surface |
| Voltage Rating | 300V |
| Custom | Core CSA, pair shielding, length, colour |
Request datasheet, custom length, or OEM pricing: sales@rovcable.com -- Shanghai Kabel Intelligence Technology Co., Ltd.
The jacket is manufactured from a micro-cellular expanded (foamed) polyurethane compound. During extrusion, a controlled foaming agent creates millions of tiny closed-cell air pockets within the jacket wall. These air cells reduce the bulk density of the jacket below that of seawater (~1.025 g/cm³), producing positive or neutral net buoyancy. The jacket retains all the abrasion resistance, oil resistance, and flexibility of standard PUR while achieving the buoyancy needed for ROV tether applications.
Yes. Buoyancy (positive, neutral, or slightly negative) is tuned by adjusting the foam cell density in the jacket compound and the jacket wall thickness. Specify the required net buoyancy per metre (in g/m) and the water salinity (fresh / brackish / seawater) when ordering. We can also add a Kevlar or Dyneema strength member to increase tensile strength without significantly changing buoyancy.
