Advantec Qualitative Filter Papers are made of 100% cotton linter cellulose.

Grade No. 1 Retains coarse and gelatinous ppt with fast flow rate. Recommended for gas filtration, air pollution analysis, and general purpose. Grade No. 2 Retains medium crystalline ppt with high flow rate. General purpose filter. Grade No. 231 Retains crystalline ppt, moderate flow. Thin and slightly more retentive than No. 1 general purpose paper. Grade No. 232 Collects medium to medium-fine ppt. Slow flow rate. Thin retentive paper. Grade No. 131 High retention efficiency for fine crystalline ppt like BaSO4. Slow flow. Higher wet strength and will withstand suction. Grade No. 235 Highest retention efficiency collecting very fine ppt. Very slow flow rate. Grade No. 101 Creped filter paper captures large particles. Fast flow rate. Excellent for seed germination and viscous fluids .

Primarily used for clarifying and removing precipitates (ppt) and preparation for quantitative analysis. These papers can be used over a pH range from 0-12 and a maximum temperature of 120oC. Ash content of 0.1%. Papers have smooth surface, normal hardness (except No. 101 has creped surface).