GR613 Filter Paper Circles 1000 Circles/PK. 4.70cm diameter circles. Qualitative High Purity Filter Paper. Medium filtration speed abs. Weight 70g/m2 Thickness 0.17mm Herzberg 114sec/100ml Rapidity 60ml/min Capillary Rise 25mm Retention 6um smooth 70% cotton/30% wood fiber. Exact Match 28342-054

GR613 Filter Paper Sheets 1000/PK. 8 x8 sheets. Qualitative High Purity Filter Paper. Medium filtration speed absorbence. Weight 70g/m2 Thickness 0.17mm Herzberg 114sec/100ml Rapidity 60ml/min Capillary Rise 25mm Retention 6um smooth 70% cotton/30% wood fiber. Exact Match 28342-022

GR615 Filter Paper Circles 100 Circles/PK. 50PK/CS. 25.00cm diameter circles. Qualitative High Purity Filter Paper. Fast filtration speed/abs. Weight 70g/m2 Thickness 0.26mm Herzberg 29sec/100ml Rapidity 235ml/min Capillary Rise 32mm Retention 25um Creped surface 70% cotton/30% wood fiber. Exact Match 71440-036

FILTER PAPER Qualitative High Purity Grade 631 7 cm circle 100/pk Exact Match 47749-690

Black Filter Paper Circles 100 Circles/PK. 100PK/CS. 9.00cm diameter circles. Smooth Black Finish Visual Test Filter Paper. Weight 85g/m2 Thickness 0.18mm Herzberg 114sec/100ml Rapidity 60ml/min Capillary Rise 22mm Retention 4um 100% wood fiber. Exact Match 28342-010

Ahlstrom manufactures a series of extremely high purity, acid washed filter papers designed for use in analytical and gravimetric analysis. The quantitative grades are manufactured from top quality cotton linters using ultra-pure, reverse-osmosis water and are further treated with dilute acid to remove any remaining organic and inorganic impurities. All quantitative grades are manufactured in a strictly controlled environment that ensures high uniformity and high purity from filter to filter. Quantitative analysis Low ash content 0.007% (Acid-wash treated) High wet-strength Consistent performance Custom cut Bulk packaging Ashless Grades (Ash 0.007%) These standard ashless grades are high purity filter papers suitable for routine quantitative gravimetric techniques and in the preparation of samples for use in analysis involving instrumental techniques. Ahlstrom 74: 2.0µm – Medium Speed This grade has medium flow rate and good particle retention and is the most commonly used acidwashed filter. Ahlstrom 74 covers a wide range of general ashless filtration applications. It is used for gravimetric analysis of numerous components (e.g.: cements, copper, clay, bismuth, silicon, iron) found in heavy industries such as construction, mining or steel. Ahlstrom 74 is also used as a high purity filter for speedy filtering of trace elements such as silver chromate, lead sulfate, zinc and ammonium hydroxides. Ahlstrom 74 is also found in general soil analysis for separating solid from aqueous extracts. Grade: 74 Retention (µm): 2.0 Filtration Speed (Herzberg sec/100mls): 229 Filtration Speed Rapidity (mls/min): 30 Loading Capacity: Medium

Ahlstrom-Munksjo Filtration LLC
Mfg Item # : 6090-1100
Ahlstrom’s qualitative grades of filter paper are, by definition, recommended for use in analytical methods, which determine or identify particulate constituents of a mixture irrespective of the amount present. Qualitative filter papers are often used in routine separation work that still requires high purity and consistent performance. Ahlstrom offers a complete range of low ash filter papers for general laboratory work that provides you with the correct combination of particle retention, filtration speed, loading capacity and wet-strength. All our qualitative grades consist of > 95% super refined a-cellulose and linter fibers. Qualitative analysis Low ash content 0.06%/li> Untreated/li> Consistent performance/li> Wet-strengthened grades available/li> Custom cut/li> Bulk packaging/li> Standard Grades (Non Wet-Strengthened) Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications. These grades contain a high level of alpha-cellulose that provides high purity but will weaken when wet. The inherent strength of standard (untreated) grades does not pose a problem when they are used in routine quadrant folded applications. We do not recommend these grades for use in vacuum work or when wet handling is required. Ahlstrom 609: 4Ým – Medium Speed This grade is an evolution of Ahlstrom 613 for use in the beer industry. This is a filter paper with an extremely low iron and nitrogen content for the analysis of protein in beer.

Ahlstrom manufactures a series of extremely high purity, acid washed filter papers designed for use in analytical and gravimetric analysis. The quantitative grades are manufactured from top quality cotton linters using ultra-pure, reverse-osmosis water and are further treated with dilute acid to remove any remaining organic and inorganic impurities. All quantitative grades are manufactured in a strictly controlled environment that ensures high uniformity and high purity from filter to filter. Key Features Quantitative analysis Low ash content 0.007% (Acid-wash treated) High wet-strength Consistent performance Hardened grades available Custom cut Bulk packaging Ashless Grades (Ash 0.007%) These standard ashless grades are high purity filter papers suitable for routine quantitative gravimetric techniques and in the preparation of samples for use in analysis involving instrumental techniques. Ahlstrom 54: 10µm – Fast Speed This is a fast filtering grade for rapid filtration of coarse particles and gelatinous precipitates such as iron, zirconium and aluminum hydroxides, and cobalt sulfide. Ahlstrom 54 is also used in air pollution testing to determine gaseous compounds. It is recommended for fast analysis procedures for unstable precipitates such as silicon, which requires speedy filtration. Grade: 54 Retention (µm): 10.0 Filtration Speed (Herzberg sec/100mls): 34 Filtration Speed Rapidity (mls/min): 200 Loading Capacity: Medium

Ahlstrom-Munksjo Filtration LLC
Mfg Item # : 6090-3200
Ahlstrom’s qualitative grades of filter paper are, by definition, recommended for use in analytical methods, which determine or identify particulate constituents of a mixture irrespective of the amount present. Qualitative filter papers are often used in routine separation work that still requires high purity and consistent performance. Ahlstrom offers a complete range of low ash filter papers for general laboratory work that provides you with the correct combination of particle retention, filtration speed, loading capacity and wet-strength. All our qualitative grades consist of > 95% super refined a-cellulose and linter fibers. Qualitative analysis Low ash content 0.06%/li> Untreated/li> Consistent performance/li> Wet-strengthened grades available/li> Custom cut/li> Bulk packaging/li> Standard Grades (Non Wet-Strengthened) Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications. These grades contain a high level of alpha-cellulose that provides high purity but will weaken when wet. The inherent strength of standard (untreated) grades does not pose a problem when they are used in routine quadrant folded applications. We do not recommend these grades for use in vacuum work or when wet handling is required. Ahlstrom 609: 4Ým – Medium Speed This grade is an evolution of Ahlstrom 613 for use in the beer industry. This is a filter paper with an extremely low iron and nitrogen content for the analysis of protein in beer.