Grade CFP541 Cellulose filter paper, Hardened wet-strength, ashless, 21-23µm cut 32.0cm dia, 100/pk Quantitative - CFP541-320 Grade CFP541 quantitative cellulose filter media is ashless and hardened with increased wet strength. Fast flow rates and retention of approximately 21 - 23 um. Extremely low ash content of <0.01%. Thickness 0.200mm. Dimensions (L x W x H) : 8 x 8 x 1 Inch