Lab Filration - Hardened Ashless Filter Papers Brochure

15www.hahnemuehle.comHardened ashless filter papers for quantitative analysisHardened ashless filters (approx. 0.002%), especially recommended for vacuum and pressure filtration, and for the use of acidic and alkaline solutions.Made of super-refined cotton linters and cellulose ?a?? -Cellulose content above 95%, therefore high stability and durabilityAcid-washed and rinsed with water ?Free of minerals and metallic ions, ideal for the detection of ?metallic ionsHardened by small quantities of nitrogen-containing resin, which does ?not introduce significant impurities into the filtrateHigh wet strength; easy to scrap off or wash off precipitates ?High resistance to aggressive chemical components, like sulphuric ?and nitric acids (up to 40 % at 50 ° Celsius) and alkalis (up to 10 % at 20 ° Celsius)For analytical applications, routine quantitative and /or gravimetric ?proceduresTechnical specifications LabScienceALBETGrade PropertiesFiltrationHerzberg[s]Retention of particles*[µm]Weight [g/m²]Thickness [mm]1505 Fast 50 12 – 25 88 0.171506 Medium 170 4 – 12 90 0.161507 Slow 600** = 2 90 0.14* Approximate values **Measured with 150 mm water column instead of 50 mm:‘ ApplicationsGrade 1505For coarse crystalline precipitates ?Determination of proteins ?Determination of fibres in foodstuffs ?Cement analysis ?Analysis in electroplating: baths of aluminium, chrome and copper ?Grade 1506For fine crystalline precipitates ?Gravimetric determination of metals in acidic/alkaline solutions ?Analysis in electroplating: baths of aluminium, copper, nickel and tin ?Grade 1507For very fine crystalline precipitates ?Gravimetric analysis of fine metals: barium and lead sulphate, nickel and ?tin sulphide, oxalate and calcium fluorideOrdering informationThe types 1505, 1506 and 1507 are available as filter circles with the following sizes as standard (in mm): 12,5 – 12,7 – 40,5 – 47 – 55 – 70 – 90 – 110 – 125 – 150 – 185 – 240 – 320. The product reference is structured as described on page 63. Other sizes, folded filters, sheets and special cuts are available on request.Did you know that the basis for filtration was developed at the begin-ning of 20th Century? In the past the Egyptians, the Sumerians and the Romans filtered wine with textile fabrics or similar materials.18 www.hahnemuehle.comHardened highly pure filter papers for qualitative analysisHardened highly pure filter papers (approx. 0.05%) with extremely high chemical and mechanical resistance, especially recommended for vacuum and pressure filtration, and for the use of acidic and alkaline solutions.Made of super-refined cotton linters and cellulose ?a ? -cellulose content above 95%, therefore high stability and durabilityHigh wet strength; easy to scrap off or wash off precipitates, no fibre release ?Hardened by small quantities of nitrogen-containing resin, which does not introduce significant impurities ?into the filtrateVery low content of minerals (approx. 0.05% ash) ?High resistance to aggressive chemical components, like sulphuric and nitric acids (up to 40% at ?50° Celsius) and alkalis (up to 10% at 20° Celsius) and alkalis (up to 10% at 20° Celsius).Available as plain discs (DP), folded discs (DF), sheets, and rolls ?These filter papers are perfectly qualified for food control, beverage analysis and environmental monitoring.Technical specifications LabScienceALBETGrade PropertiesFiltrationHerzberg[s]Retention of particles*[µm]Weight [g/m²]Thickness [mm]1573 Fast 50 12 – 25 88 0.171574 Medium 170 7 – 12 90 0.161575 Slow 600** 2 90 0.141577 Slow 650** = 2 81 0.12* Approximate values ** Measured with 150 mm water column instead of 50 mm:We utilise different pulps, linters and glass fibre for producing more than 150 different paper varieties.www.hahnemuehle.com 19ApplicationsGrade 1573For coarse crystalline precipitates ?Iron hydroxide, aluminium, chrome, copper sulphate, bismuth, cobalt and iron ?Silicon determination in iron analysis ?As rolls for filtration of biosolids ?Grade 1574For fine crystalline precipitates ?Calcium oxalate, metal sulphide, barium sulphate and lead molybdate ?Emission controls on atmospheric pollution (sulphur oxide, ammoniac gases, etc.) ?Fat-extracting equipment ?Oil and food industry ?Grade 1575Retention of very fine precipitates, such as barium sulphate, zinc sulphide ?Grade 1577For very fine precipitates ?Used as a protective layer in filter presses ?Ordering informationThe types 1573, 1574, 1575 and 1577 are available as filter circles with the following sizes as standard (in mm): 6 – 12,5 – 12,7 – 40,5 – 47 – 55 – 70 – 90 – 110 – 125 – 150 – 185 – 240 – 320. The product reference is struc-tured as described on page 63. Other sizes, sheets, rolls and special cuts are available on request.