Measuring Method of the True Relative Humidity of Specimen Surface during Light Exposure Test of Plastics.

DOI Web Site 7 References
  • MINEMATU Yoiti
    Emeritus Professor of Shibaura Institute of Technology
  • KUROSAWA Hiroaki
    Graduate School of Shibaura Institute of Technology SHIBAURA Electronics Co. Ltd.

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Other Title
  • 光暴露試料表面の真の相対湿度の測定方法
  • ヒカリ バクロ シリョウ ヒョウメン ノ シン ノ ソウタイ シツド ノ ソク

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Abstract

In the exposure test of plastics capable of absorbing water, data on the true relative humidity of specimen surface is important and necessary to consider the effect of water content on the photodegradation. Equations for obtaining the true relative humidity of specimen surface during light exposure test of plastics are derived using the measure ment data on absolute humidity of the air and on specimen surface temperature. The absolute humidity sensor element utilizes the temperature difference of two hot thermistor beads, one in dry air and one in wet air, caused by the difference of conductivity of air. Data of relative humidity of ambient air may also be useful to obtain the truerelative humidity of specimen surface, but data of ambient temperature will be equally required for calculations.

Journal

  • Materials life

    Materials life 9 (1), 29-33, 1997

    MATERIALS LIFE SOCIETY, JAPAN

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