Question 1

Can samples be produced and are they free of charge?

Accepted Answer

We can provide samples, and if the product value is low, we can send samples for free; If the value and price of the product are high, producing samples also requires a significant cost, which would already require payment.

Question 2

How to avoid insulation cracking when laying polytetrafluoroethylene (PTFE) insulated cables in low-temperature environments (-40 ℃)?

Accepted Answer

Pre treatment before installation:

① Preheat the cable (using a hot air gun, temperature 50-60 ℃, for 10-15 minutes to avoid local overheating);

② The minimum bending radius during laying must be ≥ 10 times the outer diameter of the cable (static laying) or 15 times (dynamic laying), and "dead bending" (bending angle>90 °) is prohibited;

③ Adopting a toothless cable pulley (to avoid scratching the insulation), the traction force is controlled within 15% of the conductor fracture strength. If it has cracked, the damaged section needs to be cut off and a new joint needs to be made (using a flared connector to avoid insulation stress during tightening).

Question 3

During the production of RF coaxial cables (such as RG-402), the standing wave ratio (VSWR) exceeds the standard (>) 1.2@18GHz ）How to identify process defects?

Accepted Answer

Key troubleshooting points:

① The roundness of the inner conductor (Z0 fluctuation when tolerance>± 0.01mm) needs to be monitored online with a laser caliper (roundness ≤ 0.005mm);

② Insulation medium concentricity (uneven field strength distribution when eccentricity>5%), adjust extrusion die concentricity (error ≤ 2%);

③ The welding quality of the outer conductor (impedance mutation caused by virtual welding) is achieved by argon arc welding (welding current 8-12A, speed 15-20 m/min), followed by eddy current testing after welding;

④ The tension fluctuation of the cable (causing tensile deformation of the insulation layer) is controlled by a constant tension control system (tension fluctuation ≤± 2%). After debugging, use a network analyzer (8753ES) to scan and test VSWR across the entire frequency range (0.1~26.5GHz).

Question 4

What are the main factors affecting the delivery time of special cables? How to shorten the delivery time?

Accepted Answer

Main factors:

① Material procurement cycle (special materials such as polyimide film require 4-6 weeks);

② Process complexity (such as customized tooling for laser wire stripping and multi-core twisting);

③ Test items (such as high and low temperature cycle testing, which takes 1-2 weeks).

Measures taken to shorten delivery time:

① Lock in commonly used material inventory in advance (such as copper conductors, conventional insulation materials); ② Adopting modular design (such as standardized shielding structure);

③ Parallel sample testing and material procurement (after customer confirmation of the plan);

④ Simplify non critical testing (such as routine performance that has been verified by customers can be exempted from inspection).

Question 5

When customizing deep-sea exploration cables, customers only provide the requirement of "water pressure resistance of 6000 meters". How to refine the technical parameters?

Accepted Answer

Key parameters to be supplemented:

① Electrical performance (rated voltage AC 3kV/DC 5kV, insulation resistance ≥ 100M Ω· km);

② Mechanical properties (dynamic tensile strength ≥ 50kN, bending life ≥ 10 ⁴ times @ bending radius 10 × OD);

③ Environmental parameters (working temperature -20~60 ℃, seawater salinity 3.5%, resistance to microbial corrosion); ④ Special functions (whether to integrate fiber optic sensing and buoyancy adjustment requirements). Suggest providing the equipment operation depth curve (including instantaneous impact pressure) and designing the armor layer (316L stainless steel wire, diameter 3mm, Z-type lock armor structure) according to API 17E standard.

Question 6

What information does the customer need to provide for customizing special cables?

Accepted Answer

The customer needs to provide:

① Application scenarios (such as aviation engine compartments/deep-sea exploration equipment);

② Electrical parameters (rated voltage (AC/DC), current, signal type (analog/digital), impedance, transmission frequency); ③ Environmental parameters (temperature range, humidity, corrosive media (oil/chemical corrosion), electromagnetic interference intensity;

④ Mechanical properties (bending radius (static/dynamic), wear resistance, tensile strength);

⑤ Structural requirements (number/diameter of conductor strands, insulation/sheath material grade, shielding method (weaving/winding/foil), color/printing, minimum bending radius);

⑥ Installation method: fixed laying/mobile drag chain, buried/overhead/underwater;

⑦ Certification requirements (compliance with industry standards such as UL/CE/CCC/EN);

⑧ Testing standards (such as withstand voltage test, insulation resistance test, combustion test).

Question 7

How to accurately control the buoyancy deviation of the zero buoyancy cable of underwater robots during operation exceeding ± 5% (design buoyancy of 0kg/m)?

Accepted Answer

Through the synergistic regulation of "material density+structural cavity":
① Select low-density polyethylene (LDPE) foam sheath (density 0.7~0.9g/cm ³, foam ratio 30%~50%, control density by adjusting nitrogen injection amount);
② Hollow microspheres (glass microspheres, density 0.2g/cm ³, volume ratio 15%~20%) are embedded in the cable core;
③ Calculation formula: Buoyancy (kg/m)=(sheath volume+cavity volume) × 1 (water density) - total cable mass (kg/m). By adjusting the foaming ratio and microsphere content, the buoyancy is controlled within ± 3%. A suspension test (24 hours) needs to be conducted in the pool to verify stability.

Name	Size	Downloads	Update	Copy Link	Download
Braided Wave-proof Sheath.pdf	98KB	4	2026-03-26	Copy Link https://www.raysspecialcable.com/phoenix/admin/download?fileId=zdfUrgkPenmj&dp=GvUApKfKKUAU	Download
Coaxial RF Cable.pdf	6.85MB	3	2026-03-26	Copy Link https://www.raysspecialcable.com/phoenix/admin/download?fileId=uDUKWqukTnyE&dp=GvUApKfKKUAU	Download
High-speed Differential Cable.pdf	363KB	3	2026-03-26	Copy Link https://www.raysspecialcable.com/phoenix/admin/download?fileId=yPfKrquaTdoZ&dp=GvUApKfKKUAU	Download
Instrumentation Cable.pdf	394KB	3	2026-03-26	Copy Link https://www.raysspecialcable.com/phoenix/admin/download?fileId=pkpfCBPazeUj&dp=GvUApKfKKUAU	Download
QRA High-performance transmission conductor.pdf	2.25MB	3	2026-03-26	Copy Link https://www.raysspecialcable.com/phoenix/admin/download?fileId=nrfKhqFkzTgO&dp=GvUApKfKKUAU	Download
Shipboard Cable.pdf	1.28MB	6	2026-03-26	Copy Link https://www.raysspecialcable.com/phoenix/admin/download?fileId=oWAfCgauzerj&dp=GvUApKfKKUAU	Download

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FAQ

Q Can samples be produced and are they free of charge?

Q How to avoid insulation cracking when laying polytetrafluoroethylene (PTFE) insulated cables in low-temperature environments (-40 ℃)?

Q During the production of RF coaxial cables (such as RG-402), the standing wave ratio (VSWR) exceeds the standard (>) 1.2@18GHz ）How to identify process defects?

Q What are the main factors affecting the delivery time of special cables? How to shorten the delivery time?

Q When customizing deep-sea exploration cables, customers only provide the requirement of "water pressure resistance of 6000 meters". How to refine the technical parameters?

Q What information does the customer need to provide for customizing special cables?

Q How to accurately control the buoyancy deviation of the zero buoyancy cable of underwater robots during operation exceeding ± 5% (design buoyancy of 0kg/m)?

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