PROMATECT™ 100 is resistant to the effects of moisture and will not physically deteriorate when used in damp or humid conditions. One face of the board is smooth and ready to form a finished surface, able to receive almost any form of architectural/finish treatment. The reverse face is sanded. PROMATECT™ 100 comprises autoclaved calcium silicate spheres (PROMAXON™ is a synthetic hydrated calcium silicate in spherical form) bound in a mineral matrix. PromaX™ technology provides excellent fire performance in most applications.