Grade CFP540 Cellulose filter paper, Hardened wet-strength, ashless, 7-8µm cut 24.0cm dia, 100/pk Quantitative - CFP540-240 Grade CFP540 quantitative cellulose filter media is ashless and hardened with increased wet strength. Medium flow rates and retention of approximately 7 - 8 um. Extremely low ash content of <0.01%. Thickness 0.210mm. Dimensions (L x W x H) : 8 x 8 x 1 Inch