... interior harmful gas molecules. 2..Dedicated to the adsorption of formaldehyde, benzenes, ammonia, radon and other harmful gases ... radon and other harmful gases indoors. Meanwhile it owns of removing away of mildew smell, deodorize and sterilize. For the constant ... time, SINCHEM had got the approval of FDA (Food and Drug Administration). As to chemical properties of silicon, stability, high-security, ...