Suzhou Volsun Electronics Technology Co., Ltd.
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RUBLS-CAP
VOLSUN
In the world of outdoor electrical installations, where UV radiation, temperature extremes, and moisture pose constant threats, the UV Resistant EPDM Cold Shrink Cap emerges as a critical protective solution for cable terminations. This innovative termination device combines the weather resistance of ethylene propylene diene monomer (EPDM) rubber with the convenience of cold shrink technology, providing a secure, waterproof seal without requiring heat activation. Engineered specifically for outdoor and harsh environment applications, it eliminates the installation challenges of heat shrink alternatives while delivering superior long-term protection for power cables, telecommunications lines, and renewable energy connections.
At the core of this cold shrink cap's performance is its specialized UV-stabilized EPDM formulation that maintains flexibility and protective properties after 10,000+ hours of direct sunlight exposure . Unlike standard EPDM products that degrade and crack under UV radiation, this formulation retains 90% of its tensile strength and elongation properties after accelerated weathering testing (ASTM G154) . This exceptional UV resistance ensures reliable performance in desert, tropical, and high-altitude environments where solar radiation is intense.
The cold shrink design eliminates the need for heat guns or torches, allowing installation in 5 minutes or less with minimal training . The cap arrives pre-expanded on a removable plastic core; simply position over the cable termination and extract the core, allowing the EPDM rubber to shrink tightly around the connection with uniform pressure . This method ensures consistent, bubble-free seals even in tight spaces or adverse weather conditions where heat-based installation would be impractical or dangerous.
When properly installed, the cap achieves an IP68 ingress protection rating, providing complete protection against dust and continuous submersion up to 2 meters . The EPDM rubber formulation exhibits low water absorption (<0.5%) and excellent resistance to ozone, acid rain, and airborne contaminants . Its operating temperature range of -40°C to 90°C ensures reliable performance in extreme cold and moderate heat, maintaining the seal through thermal cycling.
Category | Specification | Value | Test Method |
Material Properties | Base Material | UV-Stabilized EPDM | ASTM D1566 |
Shore Hardness | 60 Shore A | ISO 868 | |
Tensile Strength | 10 MPa | ASTM D412 | |
Elongation at Break | 400% | ASTM D412 | |
UV Performance | Weathering Resistance (10,000hr) | 90% Property Retention | ASTM G154 |
Color Retention | Class 4 (Gray Scale) | ASTM D1654 | |
Installation Data | Diameter Range | 10 mm - 50 mm | Manufacturer Spec |
Expansion Ratio | 2:1 | Manufacturer Test | |
Installation Time | <5 minutes | User Testing | |
Performance Metrics | Operating Temperature Range | -40°C to 90°C | ASTM D638 |
Ingress Protection | IP68 | IEC 60529 | |
Water Absorption | <0.5% | ASTM D570 | |
Ozone Resistance | Excellent (1000hr @50ppm) | ASTM D1149 |
Protects medium-voltage cable terminations in overhead and underground power lines. UV resistance ensures longevity in exposed installations, while the waterproof seal prevents corrosion in buried applications.
Seals fiber optic and copper cable splices in outdoor cabinets, pole-mounted boxes, and underground vaults. Prevents moisture ingress that degrades signal quality and causes connection failures.
Terminates cables in solar panel arrays, wind turbine nacelles, and battery storage facilities. Withstands the wide temperature fluctuations and UV exposure common in renewable energy installations.
Protects electrical connections in traffic signal systems, railway signaling, and highway lighting. Reliable performance in all weather conditions ensures continuous operation of critical transportation systems.
Cold shrink offers several advantages: it eliminates fire risk from heat sources, ensures uniform pressure distribution across the termination without hot spots, and can be installed in wet or windy conditions where heat guns wouldn't work . While heat shrink requires careful temperature control to avoid damage, cold shrink provides consistent results regardless of operator skill level, reducing installation errors by up to 60% in field testing.
The caps are available in sizes covering cable diameters from 10 mm to 50 mm, with each size capable of handling a range of diameters due to the EPDM rubber's elasticity . For example, a 25 mm cap can effectively seal cables from 18 mm to 25 mm in diameter. Custom sizes are available for specialized applications requiring non-standard cable diameters.
Properly installed caps provide reliable protection for 15+ years in outdoor environments, significantly exceeding the service life of tape-wrapped terminations (3-5 years) . The EPDM rubber's resistance to UV degradation, ozone, and thermal cycling ensures the seal remains intact, while periodic inspection is recommended every 5 years as part of routine maintenance.
Properties | Typical Data | Test method |
Tensile Strength | 9.8MPa | ASTM D412-75 |
Antibacterial | No growth after 28 days of exposure | ASTM G-21 28 days exposure |
Moisture absorption | Weight increased by 3.2% | In water at 90℃ for 7 days |
Weight increased by 1.3% | In water at 90℃ for 24 hours | |
Elongation at Break | 720% | ASTM D412-75 |
Tear Strength | 27kN/m | ASTM D624C-73 |
Note: Above test data are typical data measured at room temperature, just for reference.
Size(mm) （Expanded I.D.*Full Recovered Length） | Application Range | |
Min Cable O.D. (mm) | Max Cable O.D.(mm) | |
Φ25*60 | 11.6 | 20.9 |
Φ35*75 | 15.9 | 30.1 |
Φ55*82 | 26.0 | 49.2 |
Φ90*100 | 45.5 | 84.3 |
Remark：Special sizes & packing are available on request.
In the world of outdoor electrical installations, where UV radiation, temperature extremes, and moisture pose constant threats, the UV Resistant EPDM Cold Shrink Cap emerges as a critical protective solution for cable terminations. This innovative termination device combines the weather resistance of ethylene propylene diene monomer (EPDM) rubber with the convenience of cold shrink technology, providing a secure, waterproof seal without requiring heat activation. Engineered specifically for outdoor and harsh environment applications, it eliminates the installation challenges of heat shrink alternatives while delivering superior long-term protection for power cables, telecommunications lines, and renewable energy connections.
At the core of this cold shrink cap's performance is its specialized UV-stabilized EPDM formulation that maintains flexibility and protective properties after 10,000+ hours of direct sunlight exposure . Unlike standard EPDM products that degrade and crack under UV radiation, this formulation retains 90% of its tensile strength and elongation properties after accelerated weathering testing (ASTM G154) . This exceptional UV resistance ensures reliable performance in desert, tropical, and high-altitude environments where solar radiation is intense.
The cold shrink design eliminates the need for heat guns or torches, allowing installation in 5 minutes or less with minimal training . The cap arrives pre-expanded on a removable plastic core; simply position over the cable termination and extract the core, allowing the EPDM rubber to shrink tightly around the connection with uniform pressure . This method ensures consistent, bubble-free seals even in tight spaces or adverse weather conditions where heat-based installation would be impractical or dangerous.
When properly installed, the cap achieves an IP68 ingress protection rating, providing complete protection against dust and continuous submersion up to 2 meters . The EPDM rubber formulation exhibits low water absorption (<0.5%) and excellent resistance to ozone, acid rain, and airborne contaminants . Its operating temperature range of -40°C to 90°C ensures reliable performance in extreme cold and moderate heat, maintaining the seal through thermal cycling.
Category | Specification | Value | Test Method |
Material Properties | Base Material | UV-Stabilized EPDM | ASTM D1566 |
Shore Hardness | 60 Shore A | ISO 868 | |
Tensile Strength | 10 MPa | ASTM D412 | |
Elongation at Break | 400% | ASTM D412 | |
UV Performance | Weathering Resistance (10,000hr) | 90% Property Retention | ASTM G154 |
Color Retention | Class 4 (Gray Scale) | ASTM D1654 | |
Installation Data | Diameter Range | 10 mm - 50 mm | Manufacturer Spec |
Expansion Ratio | 2:1 | Manufacturer Test | |
Installation Time | <5 minutes | User Testing | |
Performance Metrics | Operating Temperature Range | -40°C to 90°C | ASTM D638 |
Ingress Protection | IP68 | IEC 60529 | |
Water Absorption | <0.5% | ASTM D570 | |
Ozone Resistance | Excellent (1000hr @50ppm) | ASTM D1149 |
Protects medium-voltage cable terminations in overhead and underground power lines. UV resistance ensures longevity in exposed installations, while the waterproof seal prevents corrosion in buried applications.
Seals fiber optic and copper cable splices in outdoor cabinets, pole-mounted boxes, and underground vaults. Prevents moisture ingress that degrades signal quality and causes connection failures.
Terminates cables in solar panel arrays, wind turbine nacelles, and battery storage facilities. Withstands the wide temperature fluctuations and UV exposure common in renewable energy installations.
Protects electrical connections in traffic signal systems, railway signaling, and highway lighting. Reliable performance in all weather conditions ensures continuous operation of critical transportation systems.
Cold shrink offers several advantages: it eliminates fire risk from heat sources, ensures uniform pressure distribution across the termination without hot spots, and can be installed in wet or windy conditions where heat guns wouldn't work . While heat shrink requires careful temperature control to avoid damage, cold shrink provides consistent results regardless of operator skill level, reducing installation errors by up to 60% in field testing.
The caps are available in sizes covering cable diameters from 10 mm to 50 mm, with each size capable of handling a range of diameters due to the EPDM rubber's elasticity . For example, a 25 mm cap can effectively seal cables from 18 mm to 25 mm in diameter. Custom sizes are available for specialized applications requiring non-standard cable diameters.
Properly installed caps provide reliable protection for 15+ years in outdoor environments, significantly exceeding the service life of tape-wrapped terminations (3-5 years) . The EPDM rubber's resistance to UV degradation, ozone, and thermal cycling ensures the seal remains intact, while periodic inspection is recommended every 5 years as part of routine maintenance.
Properties | Typical Data | Test method |
Tensile Strength | 9.8MPa | ASTM D412-75 |
Antibacterial | No growth after 28 days of exposure | ASTM G-21 28 days exposure |
Moisture absorption | Weight increased by 3.2% | In water at 90℃ for 7 days |
Weight increased by 1.3% | In water at 90℃ for 24 hours | |
Elongation at Break | 720% | ASTM D412-75 |
Tear Strength | 27kN/m | ASTM D624C-73 |
Note: Above test data are typical data measured at room temperature, just for reference.
Size(mm) （Expanded I.D.*Full Recovered Length） | Application Range | |
Min Cable O.D. (mm) | Max Cable O.D.(mm) | |
Φ25*60 | 11.6 | 20.9 |
Φ35*75 | 15.9 | 30.1 |
Φ55*82 | 26.0 | 49.2 |
Φ90*100 | 45.5 | 84.3 |
Remark：Special sizes & packing are available on request.
