Kapton HN investigations Page: 4 of 18
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and Mound has shown that chemical processing with 10% KOH can dissolve the
Kapton polyimide and cause some of these particles to fall out of the film
leaving pits in the surface. These observations caused concern over the
electrical and mechanical integrity of the film and the long-term reliability
of products made with Kapton HN.
This section is divided into three subsections. First, work performed on the
slip additive in Kapton HN is presented, then work performed n polyimide
films, and, last, work with fully fabricated components.
As mentioned in the Introduction, the slip additive in Kapton HN is calcium
phosphate dibasic (CaHPO4). The identity of this compound was determined
by P. S. Wang and others at Mound early in 1987. Calcium phosphate dibasic
is soluble in acids, slightly soluble in water, and somewhat less soluble in
more basic solutions. SEM of the powder (Figure 1) shows that it
Figure 1 - Scanning electron micrograph of CaHP04 showing
the powder's tendency to form agglomerates.
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Williams, M.K.; Huelskamp, M.A.; Armstrong, K.P.; Brandon, J.L.; Lavoie, J.M. (EG and G Mound Applied Technologies, Miamisburg, OH (USA)) & Smith, A.E. (Sandia National Labs., Albuquerque, NM (USA)). Kapton HN investigations, report, September 28, 1990; United States. (https://digital.library.unt.edu/ark:/67531/metadc1207992/m1/4/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.