Filtry jakościowe fałdowane Grade 4V
Papier filtracyjny Grade 4V doskonale nadaje się do analizy jakościowej lub ogólnej filtracji roztworów gruboziarnistych. Fałdowana konstrukcja filtra zwiększa prędkość filtracji, przepływ i ładowność.
Whatman™ Grade 4V filter paper is well suited for qualitative analysis or general filtration of coarse particles. The fluted filter design increases filtration speed, flow rate, and loading capacity.

• Very fast flow rate
• Retention of coarse and gelatinous precipitates
• Nominal particle retention rating of 20–25 µm
• Fast filtration speed (Herzberg 37 s)
• Fluted (pre-pleated) for compatibility with conical filter funnels without the need for further folding

We offer a variety of Whatman™ brand qualitative filter papers. Wet-strengthened and standard grades are available.

Fluted filter for capturing gelatinous precipitate
Whatman™ Grade 4V prepleated (fluted) filter paper is frequently used to filter gelatinous precipitate or during general filtration that does not require the collection of fine particles. The filter sheets are also useful for rapid filtration of biological fluids or organic extracts prior to analysis.
Filtry jakościowe fałdowane Grade 4V
Filtry jakościowe fałdowane Grade 4V
Grade Grade 4 
Grade Type Folded (Prepleated) 
Typical Particle Retention in Liquid 25 µm 
Nominal Thickness 210 µm
Typical water flow rate 247 ml/min 
Nominal Basis Weight 92 g/m2
Nominal Ash Content 0.06% 
Material Cellulose 
Typical Trace Element Levels Aluminium 3.6 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 27.5 µg/g Chromium 1 µg/g Copper 0.9 µg/g Iron 13.7 µg/g Lead <0.5 µg/g Magnesium 21 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 6.2 µg/g Silicon 8.8 µg/g Sodium 32.3 µg/g Zinc 58.3 µg/g 
Properties Very fast 
Application Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical. 
Supporting Analysis Qualitative 
Product Product Name Diameter
1204-0185 Grade 4V Fluted Filter Paper; FF; 18.5 cm circle (100 pcs) 185 mm
1204-125 Grade 4V Fluted Filter Paper; FF; 12.5 cm circle (100 pcs) 125 mm
1204-150 Grade 4V Fluted Filter Paper; FF; 15 cm circle (100 pcs) 150 mm
1204-240 Grade 4V Fluted Filter Paper; FF; 24 cm circle (100 pcs) 240 mm
1204-270 Grade 4V Fluted Filter Paper; FF; 27 cm circle (100 pcs) 270 mm
1204-320 Grade 4V Fluted Filter Paper; FF; 12.5 cm circle (100 pcs) 320 mm