Also, in high humidity conditions, molecular level moisture adhesion is a problem.
Is that another way of saying that it gets damp?
There as ABsorb, and there is ADsorb. ABsorb is what sponges and other porous things do. Water is pulled into voids, and can be driven out with low heat, just evaporated away. ADsorb is what dye does: it forms molecular bonds and the water is firmly, "permanently" attached. It takes much higher heat to break the bonds and drive that off. It's quite possible for materials to do both. When you do ceramics, first you dry the clay, removing ABsorbed water. Then you fire it, removing the ADsorbed water (and vitrifying). --ian _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla