This Semiconductive XLPE Shield Compound is a specially formulated cable manufacturing compound designed for the production of reliable Medium Voltage (MV) and High Voltage Power Cables up to 35kV. As an essential component, it forms the smooth inner semiconductor shield and insulation shield layers in XLPE insulated cables, ensuring uniform electrical field distribution and preventing harmful partial discharges.
The compound is a crosslinkable semicon based on a conductive polymer compound with optimized carbon black dispersion. It provides excellent compatibility with TR-XLPE insulation, creating a flawless interface that minimizes contamination and enhances the long-term performance of underground, industrial, and substation cables. Manufactured to meet stringent international standards such as IEC 60502-2, it is the ideal choice for producing durable and efficient power cable shields.
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Inner Semiconductive Shield Compound for MV Power Cable Up To 35kV
This material is used as a crosslinkable semiconductive wire and cable shielding material for high-voltage power cables.
It is manufactured using:
High-quality EVA resin
Conductive black carbon (main conductive material)
Crosslinking agent
Antioxidant and other specialized additives
The mixed granulation and fabrication process ensures stable and reliable quality batch after batch.
| Parameter | Specification |
|---|---|
| Application | Shielding material for 35kV crosslinkable polyethylene (XLPE) insulated cable conductor |
| Maximum working temperature | 90°C |
| Property | Unit | Test Method | Typical Value |
|---|---|---|---|
| Density @ 23°C | g/cm³ | ASTM D792 | 1.12 |
| Tensile strength | MPa | IEC 60811-1-1 | 17.0 |
| Elongation at break | % | IEC 60811-1-1 | 308 |
| Impact embrittlement @ –40°C | Failure number / piece | ASTM D746 | 0/30 |
| Property | Variation (%) |
|---|---|
| Tensile strength variation | +7 |
| Breaking elongation variation | –5 |
| Property | Value |
|---|---|
| Elongation under load | 50% |
| Permanent deformation | 0% |
| Temperature | Value (Ω·cm) | Test Method |
|---|---|---|
| @ 20°C | 25 | ASTM D257 |
| @ 90°C | 240 | ASTM D257 |
| Parameter | Recommendation |
|---|---|
| Recommended equipment | Polyethylene-specific extruder |
| Draw ratio (L/D) | 18:1 to 25:1 |
| Wire mesh filter | 60 to 80 type (recommended) |
| Zone | 1 | 2 | 3 | 4 | 5 | Neck | Head | Die |
|---|---|---|---|---|---|---|---|---|
| Temp (°C) | 75 | 85 | 105 | 115 | 115 | 115 | 115 | 115 |
| Condition | Requirement |
|---|---|
| Temperature | Room temperature |
| Environment | Clean, dry, well ventilated |
| After opening | Dry after long-term opening (if exposed to moisture) |
| Parameter | Specification |
|---|---|
| Net weight per package | 600 kg |
| Inner packaging | Plastic sealed film bag |
| Outer packaging | Corrugated carton with palletized bottom |
| Advantage | Description |
|---|---|
| 35kV rated | Suitable for high-voltage XLPE insulation systems |
| 90°C working temperature | Excellent thermal stability |
| Low volume resistivity | 25 Ω·cm @ 20°C – superior conductivity |
| Low volume resistivity @ 90°C | 240 Ω·cm – stable at operating temperature |
| Stable aging performance | Minimal variation after 135°C / 168h aging |
| Consistent processing | Stable mixed granulation process – batch-to-batch reliability |
| High tensile strength | 17.0 MPa |
| Good elongation | 308% at break |
| Low-temperature impact resistance | 0/30 failures @ –40°C |
| Parameter | Value |
|---|---|
| Material type | Crosslinkable semiconductive shielding compound |
| Base resin | EVA |
| Conductive filler | Conductive black carbon |
| Application | 35kV XLPE insulated cable conductor shielding |
| Max working temperature | 90°C |
| Density (23°C) | 1.12 g/cm³ |
| Tensile strength | 17.0 MPa |
| Elongation at break | 308% |
| Volume resistivity (20°C) | 25 Ω·cm |
| Volume resistivity (90°C) | 240 Ω·cm |
| Hot prolongation elongation | 50% |
| Hot prolongation permanent deformation | 0% |
| Packaging | 600 kg (plastic sealed bag + corrugated carton) |
Q: What is this compound used for?
A: It is used as a crosslinkable semiconductive shielding material for 35kV XLPE insulated power cables, applied over the conductor to provide a smooth, conductive interface.
Q: What is the maximum working temperature?
A: 90°C for continuous operation.
Q: What is the volume resistivity at 20°C?
A: 25 Ω·cm – excellent conductivity for semiconductive shielding.
Q: What is the volume resistivity at 90°C?
A: 240 Ω·cm – stable performance at operating temperature.
Q: What test methods are used?
A: ASTM D792 (density), IEC 60811-1-1 (tensile/elongation), ASTM D746 (impact), ASTM D257 (volume resistivity).
Q: What is the packaging size?
A: 600 kg net weight per package – inner plastic sealed film bag + outer corrugated carton with palletized bottom.
Q: How should it be stored?
A: Store at room temperature in a clean, dry, well-ventilated environment. If the bag has been open for a long time and moisture exposure is suspected, dry before use.
Q: What extrusion equipment is recommended?
A: A polyethylene-specific extruder with L/D ratio of 18:1 to 25:1 and a 60–80 type wire mesh filter.
Q: What is the hot prolongation performance?
A: Elongation under load: 50%, Permanent deformation: 0% (tested at 200°C, 0.2 MPa, 15 min).
Q: Does it age well?
A: Yes. After 135°C for 168 hours, tensile strength variation is +7% and elongation variation is –5% – excellent stability.
| Property | This Compound | Typical Standard |
|---|---|---|
| Volume resistivity @ 20°C | 25 Ω·cm | ≤ 100 Ω·cm (excellent) |
| Volume resistivity @ 90°C | 240 Ω·cm | ≤ 500 Ω·cm (good) |
| Tensile strength | 17.0 MPa | ≥ 10 MPa |
| Elongation at break | 308% | ≥ 200% |
| Hot prolongation elongation | 50% | ≤ 80% |
| Impact embrittlement (-40°C) | 0/30 failures | ≤ 15/30 |
