Examination of a size-change test for photovoltaic encapsulation materials

David C. Miller, Xiaohong Gu, Liang Ji, George Kelly, Nichole Nickel, Paul Norum, Tsuyoshi Shioda, Govindasamy Tamizhmani, John H. Wohlgemuth

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We examine a proposed test standard that can be used to evaluate the maximum representative change in linear dimensions of sheet encapsulation products for photovoltaic modules (resulting from their thermal processing). The proposed protocol is part of a series of material-level tests being developed within Working Group 2 of the Technical Committee 82 of the International Electrotechnical Commission. The characterization tests are being developed to aid module design (by identifying the essential characteristics that should be communicated on a datasheet), quality control (via internal material acceptance and process control), and failure analysis. Discovery and interlaboratory experiments were used to select particular parameters for the size-change test. The choice of a sand substrate and aluminum carrier is explored relative to other options. The temperature uniformity of ?5?C for the substrate was confirmed using thermography. Considerations related to the heating device (hot-plate or oven) are explored. The time duration of 5 minutes was identified from the time-series photographic characterization of material specimens (EVA, ionomer, PVB, TPO, and TPU). The test procedure was revised to account for observed effects of size and edges. The interlaboratory study identified typical size-change characteristics, and also verified the absolute reproducibility of ?5% between laboratories.

Original languageEnglish (US)
Title of host publicationReliability of Photovoltaic Cells, Modules, Components, and Systems V
StatePublished - 2012
Externally publishedYes
EventReliability of Photovoltaic Cells, Modules, Components, and Systems V - San Diego, CA, United States
Duration: Aug 13 2012Aug 16 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherReliability of Photovoltaic Cells, Modules, Components, and Systems V
Country/TerritoryUnited States
CitySan Diego, CA


  • Material characteristics
  • Polymer
  • Quality assurance
  • Shrinkage

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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