As solar module designs continue to evolve toward higher power output, longer service life, and deployment in more demanding environments, the photovoltaic frame has become an increasingly important structural component. Although aluminum has traditionally been used for PV module frames, composite materials are gaining attention because they can combine high mechanical strength, electrical insulation, corrosion resistance, thermal stability, and lower material-related carbon emissions.

A composite PV panel frame is designed to do more than simply hold the edges of a solar module. It contributes to module rigidity, protects the laminated cell structure, provides mounting interfaces, and helps maintain structural integrity during wind, temperature cycling, transportation, and long-term outdoor exposure. Zhejiang Zhenshi New Material Co., Ltd. has developed composite PV frames specifically for photovoltaic applications, with its product data covering mechanical, electrical, thermal, weathering, and corrosion-related performance. The company's composite PV frame has also obtained TÜV Rheinland certification.

What Is a Composite PV Panel Frame?

A composite PV panel frame is a non-metallic structural frame manufactured from engineered composite material rather than conventional aluminum alloy. In photovoltaic modules, the frame surrounds the laminated glass and cell assembly and provides a defined structural interface between the module and its mounting system.

The key difference is the way composite materials can be engineered around the required load direction and environmental conditions. For a PV frame, properties such as tensile strength, bending strength, dimensional stability, surface durability, insulation resistance, and thermal behavior all influence the long-term reliability of the module.

Zhenshi's published technical data lists a bending strength and tensile strength of 1,400 MPa for its composite PV frame. The same product data also reports a silicone adhesive strength of 158 N/cm and a drawing force of 1,500 N, indicating that the frame is designed not only as a perimeter support but also as a mechanically robust interface for module assembly and mounting.

How Strong Are Composite PV Panel Frames?

Mechanical strength is one of the most important considerations when selecting a PV panel frame. During installation and operation, solar modules can experience wind uplift, snow loads, handling forces, transportation vibration, and repeated mechanical loading. Excessive frame deformation can transfer additional stress to the glass, encapsulant, or solar cells.

According to Zhenshi's published comparison data, its composite PV frame has a tensile and bending strength of 1,400 MPa, compared with reference aluminum-frame values of at least 215 MPa and 255 MPa respectively. The company describes the axial strength of its composite frame as approximately five times that of traditional aluminum alloy framing.

High axial strength is particularly relevant for large-format PV modules, where frame deformation can become more significant as module dimensions increase. A structurally stable frame helps maintain the geometry of the module and reduces the mechanical load transferred to fragile internal components.

The frame-to-module connection is another important engineering consideration. Zhenshi reports a silicone adhesive strength of 158 N/cm and a drawing force of 1,500 N. These characteristics can support more secure module assembly and improve resistance to mechanical separation during long-term outdoor operation.

Are Composite PV Frames Resistant to Corrosion and Salt Spray?

Environmental exposure is a major challenge for solar installations. Coastal PV projects, offshore-adjacent installations, saline environments, industrial sites, and regions with high humidity can expose module frames to moisture, salt, acids, alkalis, and other corrosive substances.

Unlike conventional metal frames, composite materials do not depend on a metallic surface coating to provide their basic resistance to corrosion. This makes material selection particularly relevant where salt spray and chemical exposure are persistent.

Zhenshi states that its composite PV frame has undergone weather-resistance testing including DH3000, TC600, HF30, DH2000+UV400 and salt-spray Level 8 testing. The company also reports a strength retention rate above 80% under its stated weathering evaluation and positions the frame for highly corrosive environments such as coastal, beach, and saline-alkali areas.

The frame is also described as resistant to strong acids, strong alkalis, metal salts, and industrial detergents. For PV developers and module manufacturers, this type of chemical resistance can be particularly valuable when the module is expected to operate for decades with limited maintenance access.

Do Composite PV Frames Provide Electrical Insulation?

Electrical behavior is another significant difference between composite and conventional metal PV frames. Aluminum is electrically conductive, so module grounding and bonding requirements must be incorporated into system design. A non-conductive frame can provide an alternative approach to electrical isolation at the module perimeter.

Zhenshi's published technical data gives its composite PV frame a volume resistivity of 1 × 10¹⁰ Ω·cm and a breakdown voltage of 28 kV. The company classifies the material as an electrical-grade insulating material.

For solar module manufacturers, electrical insulation can help reduce unintended conductive paths between structural components and electrical components. It can also influence the grounding architecture and mounting design of a PV system. However, actual grounding, bonding, insulation coordination, and electrical safety requirements still need to be evaluated according to the complete module and system design and applicable standards.

How Do Composite Frames Handle Heat and Thermal Expansion?

A solar module operates outdoors through repeated heating and cooling cycles. Solar radiation can significantly raise module temperature during the day, while nighttime temperatures can fall rapidly. The resulting expansion and contraction place repeated mechanical stress on the glass, frame, adhesive, and laminated layers.

The thermal expansion behavior of the frame is therefore an important design parameter. A significant mismatch between the thermal expansion of the frame and the glass can increase mechanical stress around the module perimeter.

Zhenshi reports a heat-deflection temperature above 220°C in its technical data and describes a heat deformation temperature exceeding 230°C in its product advantages. The company also states that the coefficient of thermal expansion of its composite frame is consistent with glass, which is intended to reduce the risk of glass damage associated with thermal deformation.

This combination of thermal stability and controlled expansion is particularly relevant to modules exposed to large temperature variations, high solar irradiance, or frequent thermal cycling.

Can Composite PV Frames Help Protect Solar Cells and Glass?

The frame is positioned around a photovoltaic laminate that contains relatively fragile components, including solar cells and tempered glass. Mechanical deformation of the frame can therefore have consequences beyond the frame itself.

A stronger frame can reduce overall module deformation under external loads. Zhenshi states that its composite frame produces less module deformation under the same load compared with its aluminum reference, helping protect the cells.

The material's mechanical response can also influence vibration and impact behavior. Zhenshi describes the composite frame as having a lower elastic modulus than tempered glass and a dynamic-load damping effect under high-frequency wind loads. According to the company's product information, this can reduce resonance-related stress and help mitigate the risk of glass breakage.

Surface durability is another consideration. Zhenshi reports a wear resistance value requiring more than 2,000 L of abrasive exposure to wear through the surface, compared with more than 200 L for the referenced aluminum coating. This can be relevant during manufacturing, transportation, installation, and long-term exposure to environmental abrasion.

How Do Composite PV Frames Support Sustainable Solar Manufacturing?

The sustainability discussion around PV modules increasingly extends beyond electricity generation to the materials used throughout the module lifecycle. Frame weight, manufacturing emissions, durability, and service life can all influence the environmental profile of a solar product.

Zhenshi states that its composite PV frame can reduce carbon emissions by more than 80% per ton compared with an aluminum alloy frame. Its Solar Photovoltaics application materials also highlight reduced carbon emissions, high strength, corrosion resistance, weather resistance, and a service life exceeding 25 years as key characteristics of its composite PV solutions.

For module manufacturers, this creates an opportunity to evaluate the frame as part of a broader material-efficiency strategy rather than treating it as a standard peripheral component. A durable frame can also be important in harsh environments where premature corrosion or mechanical degradation could increase replacement and maintenance requirements.