Quantitative Filter Papers-Grade 41: 20μm
                                                
                                                    Grade 41: 20 μm*
                                                    The fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g. iron or aluminum hydroxides).
                                                    Also used in quantitative air pollution analysis as a paper tape for impregnation when
                                                    determining gaseous compounds at high flow rates.