Grade CFP542 Cellulose filter paper, Hardened wet-strength, ashless, 2-3µm cut 32.0cm dia, 100/pk Quantitative - CFP542-320 Grade CFP542 quantitative cellulose filter media is ashless and hardened with increased wet strength. Very slow flow rates and retention of approximately 2 - 3um. Extremely low ash content of <0.01%. Thickness 0.170mm. Dimensions (L x W x H) : 8 x 8 x 1 Inch