EPR High Voltage Insulation Tape
 | EPR High Voltage Insulation Tape
Contact Us |
High Heat Tape Company is a manufacturer of epr high voltage insulation tape for power cable joints, terminations, underground cable routes, and substation insulation systems. Made from self-amalgamating ethylene propylene rubber, this tape rebuilds a high-resistivity insulation layer on 35kV and 69kV solid dielectric cable assemblies. It is used where XLPE insulation, PVC or PE sheath areas, semi-conducting screens, and stress control layers must be matched correctly. This is not a general-purpose waterproof repair tape or low-voltage household rubber wrap.
Product Photos
Product Overview
This EPR insulation tape is produced for medium and high voltage cable accessory work where a wrapped layer must do more than cover the surface. It needs to stretch over connector barrels, cable step-down areas, prepared XLPE insulation, and screen cutback zones while keeping a stable electrical insulation path. In high voltage cable splicing tape applications, even small air gaps or uneven build-up can affect long-term reliability, so conformability and fusion after stretching are important selection points.
During application, the tape is normally pulled under controlled tension and wrapped with 50% half-lap coverage. This helps each layer merge into a compact EPR rubber insulation layer instead of sitting as loose overlapping strips. For this product grade, factory reference checks commonly focus on 0.76 mm thickness, dielectric strength around 30-38 kV/mm, volume resistivity at or above 10^14 ohm.cm, and elongation around 700%-1000%. Final use should be matched with the cable voltage class, joint design, surface preparation, and project test requirements.
Technical Data Sheet
Item | Typical Value |
Backing material | Ethylene propylene rubber, self-amalgamating |
Typical color | Black |
Standard thickness | 0.76 mm |
Common widths | 19 mm, 25 mm, 38 mm, 50 mm |
Roll length reference | 5 m, 9.1 m, 10 m |
Dielectric strength | 30-38 kV/mm |
Volume resistivity | >=10^14 ohm.cm |
Elongation at break | 700%-1000% |
Tensile strength | 2.0-3.0 MPa |
Continuous operating temperature | 90 C |
Emergency overload temperature | 130 C |
Fusion behavior | Pass after controlled stretch wrapping |
Cable insulation compatibility | XLPE, EPR, PE, PVC sheath systems after testing |
Recommended wrapping method | 50% half-lap with controlled tension |
Damp-heat observation | Check fusion, cracking, dielectric retention, resistivity trend |
Benefits
- Forms a high-resistivity EPR rubber insulation layer for prepared cable joints and terminations.
- Supports 35kV stress cone insulation and insulation recovery in 69kV joint assemblies when used within a qualified accessory design.
- High elongation helps the tape follow connector steps, lug profiles, and uneven cable surfaces.
- Self-amalgamating rubber construction improves fusion after controlled stretching and 50% half-lap wrapping.
- Works with XLPE cable insulation compatibility checks and PVC or PE sheath transition areas.
- 90 C continuous operation and 130 C emergency overload reference range suit many medium voltage cable systems.
- Keeps the insulation layer clearly separated from semi-conducting screen repair, stress control, and outer protection layers.
- After heat-ageing or damp-heat exposure, inspection can focus on fusion, surface cracks, dielectric retention, and volume resistivity change.
Applications
- Main insulation recovery over connector barrels in medium and high voltage cable splices.
- Cable termination insulation tape use around prepared XLPE cable ends and screen cutback areas.
- Underground cable joints where moisture resistance and electrical insulation stability are both required.
- Stress cone build-up in qualified 35kV termination assemblies.
- Insulation build-up for solid dielectric power cable joints rated up to 69kV.
- Bus bar insulation where a conformable EPR layer is required over irregular metal profiles.
- End sealing of high-voltage cables before applying outer protection tape or molded cable components.
- Cable jacket repair zones where the repair design also requires electrical insulation control.
What makes EPR tape suitable for 35kV and 69kV cable insulation systems?
EPR high voltage insulation tape is chosen for cable accessory work because it can build a flexible insulation body around non-flat joint profiles. In a 35kV termination, the stress cone area needs clean layering near the screen cutback so electrical stress is not concentrated at a sharp edge. In a 69kV splice, the wrapped insulation must cover the connector area evenly and reduce trapped air between layers. Compared with general self-fusing sealing tape, this material is selected for dielectric strength, volume resistivity, stretch recovery, and stable fusion on solid dielectric cable systems.
How should insulating EPR tape work with semi-conducting and stress control layers?
A high voltage cable joint is built as a layered electrical system, not as a single rubber wrap. Semi-conducting EPR tape is used to rebuild screen continuity or smooth the transition near the conductor and core screen. Stress control tape helps manage electric field concentration around the screen cutback and termination area. The insulating EPR tape should be applied as the high-resistivity primary layer over the prepared insulation zone, not as a replacement for the semi-conducting layer. For substation cables, underground joints, and indoor terminations, separating these functions helps improve insulation stability and reduces wrong-layer selection during installation.
FAQ
Is this tape the same as ordinary self-fusing waterproof tape?
No. Ordinary self-fusing waterproof tape is mainly selected for sealing. This product is selected where dielectric strength, high volume resistivity, and controlled insulation build-up are required in medium and high voltage cable systems.
Can it be used directly on XLPE cable insulation?
Yes. It can be used with XLPE cable insulation systems when the cable surface is clean, dry, and prepared according to the joint or termination design. Sample wrapping and electrical checks are recommended before bulk use.
Does it replace semi-conducting EPR tape?
No. Semi-conducting tape and insulating EPR tape have different roles. Semi-conducting tape supports screen continuity and stress smoothing, while this tape builds the main high-resistivity insulation layer.
What should be checked after damp-heat or heat ageing exposure?
Check whether the tape remains fused, whether the surface shows cracking or lifting, and whether dielectric strength and volume resistivity remain within the required insulation range for the cable system.