A steady and uniform current relies not only on high-quality conductor structures and performance, but also on the quality of two key components in the cable: the insulation and sheath materials.
In actual energy projects, cables are often exposed to harsh environmental conditions for extended periods. From direct UV exposure, building fires, underground burial, extreme cold, to heavy rain, all pose challenges to the insulation and sheath materials of photovoltaic cables. The most common materials used include cross-linked polyolefin (XLPO), cross-linked polyethylene (XLPE), and polyvinyl chloride (PVC). Each of these materials has distinct properties suitable for different environmental conditions and project requirements. They effectively prevent energy loss and short circuits, and reduce risks such as fire or electric shock.
PVC (Polyvinyl Chloride):
Due to its flexibility, moderate price, and ease of processing, PVC remains a commonly used raw material for cable insulation and sheathing. As a thermoplastic material, PVC can be easily molded into various shapes. In photovoltaic systems, it is often selected as a sheath material, offering abrasion protection for inner conductors while helping reduce the overall project budget.
XLPE (Cross-linked Polyethylene):
Produced using a professional silane cross-linking process, silane coupling agents are introduced into polyethylene to enhance strength and aging resistance. When applied to cables, this molecular structure significantly improves mechanical strength and stability, ensuring durability under extreme weather conditions.
XLPO (Cross-linked Polyolefin):
Produced through a specialized irradiation cross-linking process, linear polymers are transformed into high-performance polymers with a three-dimensional network structure. It offers excellent UV resistance, thermal resistance, cold resistance, and mechanical properties. With greater flexibility and weather resistance than XLPE, it is easier to install and maneuver in complex layouts—making it particularly suitable for rooftop solar panels or ground-mounted array systems.
Our XLPO compound for photovoltaic cables complies with RoHS, REACH, and other international environmental standards. It meets the performance requirements of EN 50618:2014, TÜV 2PfG 1169, and IEC 62930:2017, and is suitable for use in the insulation and sheath layers of photovoltaic cables. The material ensures environmental safety while offering excellent processing flow and smooth extrusion surface, improving cable manufacturing efficiency and product consistency.
Fire & Water Resistance
XLPO, after irradiation cross-linking, possesses inherent flame retardant properties. It maintains stability under high temperature and pressure, significantly reducing fire risk. It also supports AD8-rated water resistance, making it suitable for humid or rainy environments. In contrast, XLPE lacks inherent flame retardancy and is better suited for systems requiring strong water resistance. While PVC has self-extinguishing ability, its combustion may release more complex gases.
Toxicity & Environmental Impact
XLPO and XLPE are both halogen-free, low-smoke materials that do not release chlorine gas, dioxins, or corrosive acid mist during combustion, offering greater environmental friendliness. PVC, on the other hand, can emit harmful gases to humans and the environment at high temperatures. Furthermore, the high degree of cross-linking in XLPO gives it a longer service life, helping reduce long-term replacement and maintenance costs.
XLPO & XLPE
Application Scenarios: Large-scale solar power plants in regions with strong sunlight or harsh climates, commercial and industrial solar rooftops, ground-mounted solar arrays, underground corrosion-resistant projects.
Their flexibility supports complex layouts, as cables need to navigate obstacles or undergo frequent adjustments during installation. XLPO’s durability under extreme weather conditions makes it a reliable choice for regions with temperature fluctuations and harsh environments. Particularly in photovoltaic projects with high demands for flame retardancy, environmental protection, and longevity, XLPO stands out as the preferred material.
PVC
Application Scenarios: Indoor solar installations, shaded rooftop solar systems, and projects in temperate climates with limited sunlight exposure.
Although PVC has lower UV and heat resistance, it performs well in moderately exposed environments (such as indoor systems or partially shaded outdoor systems) and offers a budget-friendly option.
Post time: Jul-25-2025