Welcome to visit the website of HJ Polymer China Co., Ltd. ---Custom Semi-conductive Compound for MV power cable
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Welcome to visit the website of HJ Polymer China Co., Ltd. ---Custom Semi-conductive Compound for MV power cable
Delivery Capacity
HJ Polymer operates 13 dedicated production lines within a 30,000+ m2 facility, utilizing automated process control systems to ensure efficient and stable delivery.
Collaboration
Our R&D team includes PhDs and senior engineers actively involved in national and industry standards. Custom Semi-conductive Compound for MV power cable. We've also established a graduate workstation with Jiangsu University of Science and Technology, promoting integrated industry-academia collaboration.
Established In
Factory Area
Annual Production Capacity
Employees
HJ Polymer China Co., Ltd. has manufactured semi-conductive shielding compounds for power cables since 2002 from Jiangyin, Jiangsu. Our MV Cable Conductor Shield Compound manufacturer range covers the conductor-shield layer of 6–35 kV medium-voltage cables, where the material controls the electric field at the conductor interface and protects the insulation structure.
Thirteen dedicated production lines and 62,000 tons of annual capacity support medium- and high-voltage grade materials, with automated process control for stable delivery to cable factories in more than 30 countries and regions.
As a Medium Voltage Power Cable Semi-conductive Shield Compound Manufacturer, we match product configuration to the application, operating limits, interfaces and acceptance criteria defined for each project.
In a 6–35 kV cable, the conductor shield is extruded directly over the stranded conductor and forms a bonded, semi-conductive interface with the XLPE insulation. Its job is to smooth the field gradient at the conductor surface, eliminate voids and corona sites, and prevent the sharp-field erosion that shortens insulation life.
Because the layer is hidden inside the cable, its quality shows up later as partial-discharge behaviour, adhesion consistency and long-term dielectric stability. We formulate around three variables that decide that behaviour: carbon black dispersion, surface smoothness and adhesion to the insulation.
The MV conductor shield family is organised by the production problem each grade solves, so a cable plant can match compound to line speed, insulation system and conductor material rather than compromise on one grade for every job.
| Grade | Positioning | Typical Fit |
|---|---|---|
| HJ0301 | Standard conductor shielding compound | General 6–35 kV XLPE distribution cable |
| HJ0302 | Bonded insulation grade | Cables requiring firm shield-to-insulation bonding |
| HJ0304 | Fast line speed grade | High-output CCV lines running thin shield walls |
| HJ0305 | Copper oxidation resistance grade | Stranded copper conductors prone to oxidation at the interface |
| HJ0303 | Conductor shielding compound | MV cable builds with specific process requirements |
Insulation-side shielding for the same cable constructions is covered by our Power Cable Semi-conductive Insulation Shielding Compound Suppliers range, including easy-strippable, super-clean, fast line speed and copper oxidation resistance grades.
Conductor shield compounds are specified into urban medium-voltage distribution cables, renewable-energy collection circuits, rail and transit power feeds, and industrial power distribution where 6–35 kV XLPE constructions are used. The same family also supports specialty cables where a controlled semi-conductive interface is required.
Each grade is supplied as pelletised compound with a defined melt flow window, density and carbon black system. Electrical and mechanical performance is verified against the cable standard the finished cable must meet, and our products comply with UL, IEC and GB requirements.
| Parameter | Why It Matters on the Line |
|---|---|
| Volume resistivity | Sets the field transition quality at the conductor interface |
| Surface smoothness and gel content | Reduces protrusions that initiate partial discharge |
| Adhesion to XLPE insulation | Prevents delamination and interface voids |
| Melt flow and extrusion behaviour | Controls output, wall concentricity and line stability |
| Thermal-oxidative stability | Protects copper conductors and maintains cure behaviour |
Our Jiangyin site operates 13 dedicated production lines in a facility of more than 30,000 m², with automated process control systems governing compounding and pelletising. Annual output reaches 62,000 tons of medium- and high-voltage grade materials, and monthly capacity of 5,200 tons supports repeat supply programmes.
Quality management is certified to a recognised system standard, and products are tested for electrical, mechanical and cleanliness performance before release. The company holds 3 authorised invention patents and 40 authorised utility model patents, with further applications in progress, and our R&D team includes PhDs and senior engineers involved in national and industry standards.
We treat the compound as one part of the customer's process window. Where a standard grade does not match the line, we adjust the formulation around the target working point rather than asking the plant to change its process.
Conductor shield compound runs on standard CCV or VCX extrusion equipment with a dedicated extruder, and the material is normally processed with conductor preheating and controlled cooling to protect the interface. We support the trial with recommended barrel temperature profiles and drying guidance for the specific grade.
For series supply, we coordinate packaging, documentation and delivery scope with the plant's material handling, and our service team responds to process or quality questions during ramp-up and routine production. Spare-part and consumable questions are handled through the same contact route as the original order.
A proposal is prepared from the cable construction and the production target, not from a catalogue number alone. The following inputs let us select or adjust the right grade and quote accurately.
| Input | What We Need |
|---|---|
| Cable design | Voltage class, conductor size and material, insulation thickness, shield wall thickness |
| Production line | Line type, extruder configuration, target line speed, output per shift |
| Performance target | Standard to be met, resistivity band, adhesion or stripping requirement |
| Commercial scope | Trial quantity, series volume, packaging format, delivery destination |
| Documentation | Required test reports, certificates and acceptance criteria |
Our conductor shielding compounds are formulated for 6–35 kV medium-voltage power cables, including single-core and three-core XLPE constructions with copper or aluminium conductors.
Yes. HJ0304 is positioned for fast line speed operation, and we can adjust the flow window for other grades when the target output and shield wall thickness fall outside the standard range.
Samples are available so the compound can be trialled on the customer's own line before series supply. We support the trial with processing guidance for the selected grade.
Standard delivery lead time is approximately one week, subject to order quantity, packaging format and scheduling at the time of confirmation.
Grades are supplied in pelletised form in packaging aligned to the plant's feeding system. Shelf life is 9 months under the specified storage conditions, and we advise on handling to protect cleanliness before extrusion.
Our products comply with UL, IEC and GB standards, and formulations are halogen-free and compliant with RoHS and related environmental regulations. Test documentation is provided with the supply scope agreed for each project.
