A guide to laboratory filtration - Fisher Scientific

1 YesHardened Low Ash Grades (quantitative) Fine precipitate: Grade 50 ( m) Medium precipitate: Grade 52 (7 m) Coarse or gelatinous precipitate: Grade 54 (22 m)Is the filter to be ashed during gravimetric analysis and/or do you require an ashless filter ?Ashless Grades (quantitative) Medium precipitate: Grade 40 (8 m), Grade 43 (16 m) Coarse or gelatinous precipitate: Grade 41 (20 m) Fine precipitate: Grade 42 ( m), Grade 44 (3 m)Hardened Ashless Grades (quantitative) Medium precipitate: Grade 540 (8 m) Coarse or gelatinous precipitate: Grade 541 (22 m) Fine precipitate: Grade 542 ( m)NoYesYesNoYesNoNoNoYesNoNoYesWet Strengthened Grades For routine samples: Grade 91 (10 m) and Grade 93 (10 m ) For coarse or gelatinous precipitate: Grade 113 (30 m) (higher loading), Grade 114 (25 m)Binder Free Glass Microfiber Filters For Standard Methods 2540D: use Grade 934-AH or Grade 934-AH RTU For EN 872: use Grade GF/C Qualitative Grades Medium precipitate: Grade 1 (11 m), Grade 2 (8 m), Grade 3 (6 m) Fine precipitate: Grade 5 ( m), Grade 6 (3 m) Coarse or gelatinous precipitate: Grade 4 (20 -25 m)Binder Free Glass Microfiber Filters For routine samples.

2 Grade GF/B ( m), Grade GF/D ( m) For high particulate samples: Multigrade GMF 150 (1 m)Binder Free Glass Microfiber Grades: Choose most relevant grade based on characteristicsGF/F GF/B GF/C 934-AH GF/A GF/D m m m m m mStart hereIs the suspension strongly acid or alkaline?Are you determining suspended solids in water?Are you filtering under gravity or vacuum?Are you looking for a membrane pre- filter ?Is high wet strength required?Is the precipitate to be recovered from the filter ?Do you require high loading capacity, very fine retention (< m) or a glass microfiber filter ?VacuumGravityYesCOD = Chemical oxygen demand; TOC =Total organic carbon; DOC =Dissolved organic carbonNote: For guidance only. Only a selection of applications shown aboveApplications Air ventingAutomated filtration of samples/Tablet dissolution testingBiological sample preparationCapillary electrophoresisDifficult to filter samples (high solid content samples) filtration of colloidal materialHPLC/UHPLC sample preparationIon-chromatographyFiltration of protein containing samplesFiltration of nano particlesSterile filtration (use sterile filter and membrane with pore size m)COD/TOC/DOC Trace metal analysis (ICP/AAS/ICP-MS)UV/VIS hereReZist 14714 Puradisc*Notes: 3 & 9: CA, PES, PVDF 12 & 13: PES3*479*1112*13*14 Mini-UniPrep G227GD/XP47812131454 Anotop Plus*Notes: m710*5 Roby2 SPARTAN 47914 Puradisc Aqua 301213 Anotop *Notes: m34678910*1114 Puradisc FP*Notes: 3 and 9: CA3*49*1114 Mini-UniPrep27 Cellulose and glass filter papers for general laboratory filtrationFiltration devices for small volume sample preparationStep 1: Choose application Step 2.

3 Choose appropriate filterGE, imagination at work and GE monogram are trademarks of General Electric Company. 934-AH, Anotop, Whatman GD/X, GF/C, Mini-UniPrep, ReZist, SPARTAN, Whatman are trademarks of General Electric Company or one of its 2014 General Electric Company All rights reserved. First published March 2014. GE Healthcare UK Limited, Amersham. 0617143 June 2014 Symbols used in the selection guide : Also available in prepleated version: Recommended for filtration of hard to filter samples or to increase flow rate. Creped surface: increased filtration speed compared to smooth surface. All values in m refer to particle retention rating at 98% efficiency. mSelect the optimal Whatman filter for your application - Whatever you need to filter , Whatman has it guide to laboratory filtrationLayer 3 Layers 1 and 2 Layer 4 Membrane filterNeed to speed up and simplify filtration ? Consider Whatman GD/X and Mini-UniPrep ranges Mini-UniPrep filter vial and multi compressor All in one filtration of up to 8 HPLC samples in parallel GD/X - syringe filter Multilayer construction provides easier filtration of high particulate samplesGD/X4711145 2014 Thermo Fisher Scientific Inc.

4 All rights reserved. 2014 Thermo Fisher Scientific Inc. All rights reserved. 2014 Thermo Fisher Scientific Inc. All rights reserved.