Use the PFA holders with chemically aggressive liquids. Dual support screens allow for flow in either direction. Exterior locking ring designed for quick assembly without tearing the membrane. They are ideal for sterilizing and filtering ultra clean liquids under positive pressure and filtering small volumes of high-purity acids, alkalis, or organic solvents. Body and support screens of the filters are made of PFA; O-ring is made of perfluoroelastomer. Maximum operating temperature is 250°F (121°C). Autoclavable.