Not capacitive means that there are no isolated electrically conductive layers that act as capacitors. That is, the stuff isn't only non-conductive for DC. The alumina also increases thermal conductivity, and strengthens the epoxy, making removal much more difficult.
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Not capacitive means that there are no isolated electrically conductive layers that act as capacitors. That is, the stuff isn't only non-conductive for DC. The alumina also increases thermal conductivity, and strengthens the epoxy, making removal much more difficult.