Filtry składane w piramidę
Bibuła filtracyjna składana w piramidkę (kwadratowa) jest łatwa w użyciu i pozwala zaoszczędzić cenny czas podczas wykonywania powtarzających się lub wielokrotnych analiz.
Whatman™ cellulose filter paper grades are also available in pyramid (square) folded formats.

- Easily fits into conical funnels.
- Saves valuable time when undertaking repetitive or multiple analyses.
- Provides the same high quality and consistency that you expect from all Whatman™ filter papers.
Filtry składane w piramidę
Filtry składane w piramidę
What's the difference? Whatman™ folded filter paper.
Grade 41
Nominal Thickness 215 µm
Nominal Basis Weight 85 g/m2
Nominal Ash Content 0.007% 
Material Cellulose 
Grade 6
Nominal Thickness 180 µm
Nominal Basis Weight 100 g/m2
Nominal Ash Content 0.15% 
Material Cellulose 
Grade 40
Nominal Thickness 210 µm
Nominal Basis Weight 95 g/m2
Nominal Ash Content 0.007% 
Material Cellulose 
Grade 540
Alpha Cellulose Content Min. ≥98%
Material High quality cotton linters
Nominal Ash Content 0.005%
Nominal air flow rate 13 s/100 mL/in2
Nominal basis weight 85  g/m2
Nominal thickness 160 µm
Type hardened ashless
Typical Particle Retention in Liquid 8 µm
Typical Trace Element Levels Aluminium 3.4 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 14.7 µg/g Chromium 1.1 µg/g Copper 8.2 µg/g Iron 16.3 µg/g Lead <0.5 µg/g Magnesium 3.3 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 3.7 µg/g Silicon <6 µg/g Sodium 17 µg/g Zinc 87.8 µg/g  Application: Frequently used in the gravimetric analysis of metals in acid/alkali solutions and in collecting hydroxides after precipitation by strong alkalis.
Typical water flow rate 97 ml/min
Product Product Name Pack size
989810116 Grade 4 Pyramid filter paper; 110 mm; 1000/pk 1000
9891-128 Grade 6 Pyramid filter paper; 125 mm; 1000/pk 1000
9892-128 Grade 40 Pyramid filter paper; 125 mm; 1000/pk 1000
989610112 Grade 42 Pyramid filter paper; 125 mm; 1000/pk 1000
989510112 Grade 41 Pyramid filter paper; 125 mm; 1000/pk 1000
989710112 Grade 1 Pyramid filter paper; 125 mm; 1000/pk 1000
989810112 Grade 4 Pyramid filter paper; 125 mm; 1000/pk 1000
989510116 Grade 41 Pyramid filter paper; 110 mm; 1000/pk 1000
1540-10123 Grade 540 Pyramid folded filter paper; 90mm; 1000/pk 1000
1540-10124 Grade 540 Pyramid folded filter paper; 110mm; 1000/pk 1000
989610137 Grade 42 Pyramid folded filter paper; 90 mm; 1000/pk 1000
989610116 Grade 42 Pyramid folded filter paper; 110 mm; 1000/pk 1000
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