Saint-Gobain Solar’s solid silicone rubber operates as durable membrane for lamination process

During the PV module lamination process, module makers seal all components with ethylene vinyl acetate (EVA) adhesive film to ensure that module layers remain secure. High heat levels are needed to melt the EVA (typically 145-155°C). These temperatures call for a flexible, durable membrane for use in the vacuum laminator to provide compression on the module in repeated cycles.

Solution

SolarBond Membranes were developed specifically for the PV vacuum lamination process and act as a vacuum blanket, constructed from high-performance solid silicone rubber, with excellent thermal and mechanical properties, chemical inertness and long service life. This silicone enables the membrane to retain its inherent flexibility and tear-resistance through multiple lamination cycles, resulting in increased service life and lower costs. Manufactured in continuous lengths of 2.8 meter widths with no seams, both versions of SolarBond Membrane eliminate the risk of ghosting (leaving an impression) on the module, often caused by seams in joined membranes.

Applications

Module lamination process.

Platform

Each version of SolarBond Membrane is designed to specific benefits to module makers. The premier version incorporates unique additives in its formulation to resist the EVA outgassing and can last for up to 6,000 cycles, depending on EVA type, laminator model and process parameters. The standard version provides an economic solution and is ideal for smaller module manufacturing plants. The membranes are available in a 3 millimeter thickness and widths up to 2.85 meters. Additional testing to evaluate Volatile Organic Content (VOC) showed that both membrane types performed significantly better than product alternatives.

Availability

September 2011 onwards.