... perlite (Without : asbestos, formaldehyde, benzene) Appl Materials: magnesium chloride, magnesia, alkali endured epoxy cloth, perlite (Without ... , special class fire prevention, sandwiched plate in fireproof gate and packaging of equipment cases.The board ... light quality, sound insulation, heat preservation, waterproof, fireproof, free from freeing and erosion, minuteness expanding & shrinking ratio, ...