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Proceedings Paper

Evaluating the bakeout effectiveness of RTV-S691 silicone adhesive by measuring outgassing rate
Author(s): Eiji Miyazaki; Yuka Miura; Osamu Numata; Riyo Yamanaka; Susumu Baba; Junichiro Ishizawa; Yugo Kimoto; Takashi Tamura
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Paper Abstract

Outgassing rate measurements are basically performed for fresh materials, e.g. just cured adhesives, paints, etc. and reveal a lot about how the material can behave as a contamination source. It is also important to determine the bakeout process sufficiently. In the present study, a typical silicone adhesive for use in space, RTV S-691, Wacker Chemie, was selected for the measurement. Two cured specimens, 40 × 40 mm in size, were applied for several isothermal tests under identical conditions: a specimen at 125 degrees C for 144 hours with CQCM at -193 degrees C to measure TML. Consequently, it was determined that the TML and TML rate could be reduced by bakeout as expected. It also emerged that a longer bakeout, i.e. a longer cumulative bakeout time, for the material would reduce the TML and TML rate more effectively. The results suggest that bakeout mainly affects the behavior in the “low-rate” phase, whereby the TML rate curve can be divided into two phases. The elapsed time for a specimen can also be considered the cumulative test time. Based on the cumulative elapsed time, the TML rate curve is replotted and a correlation emerges between the cumulative bakeout time and TML rate. The first measurement data of TML and the TML rate could be affected by the stored time from cure, which might result from the change in unreacted substances declining as the stored time elapsed.

Paper Details

Date Published: 9 September 2014
PDF: 8 pages
Proc. SPIE 9196, Systems Contamination: Prediction, Measurement, and Control 2014, 91960A (9 September 2014); doi: 10.1117/12.2061774
Show Author Affiliations
Eiji Miyazaki, Japan Aerospace Exploration Agency (Japan)
Yuka Miura, Japan Aerospace Exploration Agency (Japan)
Osamu Numata, Japan Aerospace Exploration Agency (Japan)
Riyo Yamanaka, Japan Aerospace Exploration Agency (Japan)
Susumu Baba, Advanced Engineering Services Co., Ltd. (Japan)
Junichiro Ishizawa, Japan Aerospace Exploration Agency (Japan)
Yugo Kimoto, Japan Aerospace Exploration Agency (Japan)
Takashi Tamura, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 9196:
Systems Contamination: Prediction, Measurement, and Control 2014
Nancy Carosso; Joanne Egges, Editor(s)

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