... epoxy cloth, perlite (Without : asbestos, formaldehyde, benzene) Appl Materials: magnesium chloride, magnesia, alkali endured epoxy cloth, perlite (Without : asbestos, formaldehyde ... & shrinking ratio, free from crack and distortion, convenient construction, low wastage and long life, it is the really green fire ... without such harmful elements as asbestos, formaldehyde or benzene. magnesium oxid board