b'Filter Media / Low Temperature MaterialsPolyester Felt/Dacron Recommended continuous operation temperature .275FMaximum (short time) operation temperature 300FSupports combustion .YesBiological resistance (bacteria, mildew).No EffectResistance to alkalies FairResistance to mineral acids Fair + Resistance to organic acid FairResistance to oxidizing agents GoodResistance to organic solvents . GoodAvailable weights 10 oz. - 22 oz.Polypropylene FeltRecommended continuous operation temperature .190FMaximum (short time) operation temperature 210FSupports combustion .YesBiological resistance (bacteria, mildew) ExcellentResistance to alkalies ExcellentResistance to mineral acids .ExcellentResistance to organic acids .ExcellentResistance to oxidizing agents GoodResistance to organic solvents ExcellentAvailable weights 12 oz. - 18 oz.Combo FeltRecommended continuous operation temperature .210FMaximum (short time) operation temperature 225FSupports combustion .YesBiological resistance (bacteria, mildew) . GoodResistance to alkalies . GoodResistance to mineral acids GoodResistance to organic acids GoodResistance to oxidizing agents Good Resistance to organic solvents . GoodAvailable weights 12 oz. - 18 oz.www.standardfilter.com1.800.634.58371.760.929.8559 9'