Mechanical properties of EVA-based encapsulants

Published: May 1, 2011

By Ulrich Eitner, Project Leader, Institute for Solar Energy Research Hamelin (ISFH); Sarah Kajari-Schröder, Scientist, PV Module Technology Group, Institute for Solar Energy Research Hamelin (ISFH)

Since the 1980s, ethylene-vinyl acetate (EVA) has been the standard encapsulation material for crystalline photovoltaic modules. From a mechanical point of view, the encapsulant takes the function of a compliant buffer layer surrounding the solar cells. Therefore, understanding its complex mechanical properties is essential for a robust module design that withstands thermal and mechanical loads. In the cured state after lamination, its stiffness features a high sensitivity to temperature especially in the glass transition region around -35°C, and a dependence on time which becomes obvious in relaxation and creep behaviour. This paper outlines the viscoelastic properties of EVA and the corresponding standard experimental methods, as well as the impact on the accuracy of wind and snow load test procedures for PV modules.

US$ 21.00

Journal Subscription

Print, Digital & Archive
US$ 599 per year
  • Digital access to the entire archive (over 40 editions)
  • Print copies of 2 upcoming editions
  • Digital copies of 2 upcoming editions
  • Online access to all technical papers (Over 700)

This Website Uses Cookies

By continuing browsing this website you are accepting our Cookie Policy, as well as our Terms of Use and Privacy Policy.