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Curing Characteristics of Ethylene Vinyl Acetate (EVA) Based Encapsulants
M. Winkler, R. Baeuerlein, B. Goetz, F. Sandau
Encapsulation, Module Manufacturing, PV Materials, Qualification and Testing, Characterisation, Characterization
Components for PV Systems
Subtopic: PV Modules
Event: 27th European Photovoltaic Solar Energy Conference and Exhibition
Session: 4BV.3.25
3482 - 3485
ISBN: 3-936338-28-0
Paper DOI: 10.4229/27thEUPVSEC2012-4BV.3.25
0,00 EUR
Document(s): paper


The long term stability highly influences the total power output of a PV module over its lifetime which is the most important factor of a PV system. Delaminations and discoloration are only two examples for encapsulant degradation. Therefore PV module manufacturers have to monitor EVA’s degree of cross-linking which usually the solvent extraction method (Soxhlet) is been used for. Unfortunately this inaccurate method needs several days to get a result and a chemical laboratory is necessary. Finding a rapid but accurate method to determine the degree of crosslinking and to observe the curing characteristics of EVA is the objective of this present work. Among chemical analyzing methods, e.g. Soxhlet extraction, there are other methods like Dynamic Mechanical Analysis (DMA) and Differential Scanning Calorimetry (DSC). DMA is the most suitable method because the cross-linking process influences the mechanical properties of polymers and it observes the changes by measuring the resultant torque. For excellent results a cure meter is recommended because of the enclosed test chamber. The paper results show, that the cure meter is able to identify the curing characteristics of EVA based encapsulants. It is useful to implement this method into the incoming goods inspection of curing materials like EVA as well as developing lamination cycles in process engineering.