... resistance, small specific gravity, good hydrolyzationresistance and good oxygenation resistance, and maximum operating temperature is90 Celsius degrees. ... , 4423, 6362, 4501, 5542, 407,663, 301, and 856Polyvinyl alcohol filter fabrics series is made of polyvinyl alcohol ... strong alkali-resistance, high softening point, smallelongation, and good moisture absorption. The finishing treatment of ...