Journal of Failure Analysis and Prevention

, Volume 13, Issue 5, pp 613–618 | Cite as

Failure Analysis of Epoxy Resin Encapsulant During a Long-Term Storage

  • Guobin Zhang
  • Yusen Wang
  • Shinian Zhang
  • Chunhe Liu
Technical Article---Peer-Reviewed


In this article, the failure phenomena of softening and flow of crosslinked epoxy resin encapsulant during a long-term storage were analyzed by means of fault tree analysis, Fourier transform infrared spectroscopy, x-ray energy dispersive spectrum, and differential scanning calorimetry coupled with thermogravimetric analysis. Based on the results of those analyses, the reason of failure is identified to be that the epoxy resin was not cured completely during manufacturing, and the resulting imperfect three-dimensional crosslinked network was hydrolyzed because of the humidity in the environment during a long-term storage. Hence, the depolymerized polymers became softened gradually, and the seriously softened polymers flowed slowly because of creeping, an inherent property of the polymer materials.


Epoxy resin encapsulant Failure Long-term storage Hydrolysis 


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Copyright information

© ASM International 2013

Authors and Affiliations

  • Guobin Zhang
    • 1
    • 2
  • Yusen Wang
    • 1
  • Shinian Zhang
    • 1
  • Chunhe Liu
    • 1
  1. 1.Institute of Reliability EngineeringBeijing University of Aeronautics and AstronauticsBeijingPeople’s Republic of China
  2. 2.BeijingChina

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