Fiberglass-reinforced polyurethane composite photovoltaic panel frames: An innovative and high-performance, low-carbon choice
Fiberglass-reinforced polyurethane composite photovoltaic frames are edge protection structures for photovoltaic modules. They are made of polyurethane as the matrix and fiberglass as the reinforcement material through processes such as high-pressure infiltration, extrusion molding, and heat curing. Combining the weather resistance of polyurethane and the high strength of fiberglass, they are a new alternative solution to address the pain points of traditional aluminum frames, such as being heavy, prone to corrosion, and requiring grounding. They have important application value in the fields of lightweight and high-reliability photovoltaic modules.
Thanks to their balanced performance and cost advantages, fiberglass-reinforced polyurethane composite photovoltaic frames are expected to become the mainstream alternative material for photovoltaic frames, providing key support for the green and intelligent transformation of the photovoltaic industry.
Photovoltaic panel frames are the key structures that support and protect the modules. Traditional aluminum alloy frames are facing challenges due to issues such as high energy consumption and easy corrosion. Fiberglass-reinforced polyurethane composites (GFRPU) have become an innovative solution for the low-carbon transformation of the photovoltaic industry due to their comprehensive performance advantages.
Environmental adaptability: Good low-temperature toughness and weather resistance make it more reliable for operation in harsh environments such as cold regions with large temperature differences.
Strong weather resistance: Passed tests such as extreme temperature and ultraviolet aging, with better stability than metal frames.
High insulation, no need for grounding wires.
System cost reduction: The lightweight design (lower density than aluminum) reduces the load on the support.
Through material innovation, fiberglass-reinforced polyurethane composite frames have solved the bottlenecks of traditional metal frames in terms of corrosion protection, insulation safety, and carbon footprint, and have gradually expanded from special scenarios (offshore photovoltaics) to full-scenario applications. With the acceleration of process optimization and large-scale production, this technology will continue to promote the upgrading of the photovoltaic industry towards high efficiency, low carbon, and high reliability.
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Characteristics of PU fiberglass composites
| Property | Aluminum Alloy | Steel | R PVC | Fiberglass Reinforced Plastic | Fiberglass Reinforced Pu |
| Density (g/cm³) | 2.7 | 7.8 | 1.4 | 1.8 | 2.2 |
| Bending strength (MPa) | 170-230 | 200~500 | 70~110 | 300~600 | 1442 |
| Bending modulus (GPa) | 68 | 200 | 2.2~5 | 10~22 | 44 |
| Tensile strength (MPa) | 200~300 | ＜670 | 35~52 | 300~600 | 1220 |
| Tensile modulus (GPa) | 68 | 200 | 2.2~5 | 20~25 | 56.5 |
| Strength-weight ratio (10³N·m/kg) | 74~111 | ＜86 | 25~37 | 333 | 581 |
| Thermal Conductivity (W/m·K) | ＞150 | 36~54 | 0.14 | 0.4 | 0.114 |
| Linear expansivity (10-5K-1) | 2.2~2.4 | 1.2 | 6~7 | 0.7~6 | 0.5 |
| Volume resistivity (Ω·m) | 2.9*10-8 | 9.8*10-8 | 1*1011-12 | 1*1012 | 1.5*1012 |
| Corrosion resistance (acid, alkali, salt) | Poor | Poor | Averagely | Excellent | Excellent |
Polyurethane Glass Fiber Composite (PU-GFRP)
Lightweight & High Strength: Density is just 1/6 of steel and 1/2 of aluminum, yet delivers exceptional strength and toughness.
Superior Corrosion Resistance: Excels in harsh environments (salt spray, acids/alkalis, humidity).
High Design Flexibility: Formula adjustments enable customized hardness, elasticity, color, and surface textures to meet specific needs.
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