Filtry jakościowe Grade 4
Filtr standardowy stosowany w przypadku, gdy wymagane są wysokie przepływy w monitorowaniu zanieczyszczenia powietrza, a pobór drobnych cząstek stałych nie jest czynnikiem krytycznym.
A standard grade filter used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

Grade 4: 25 µm
Extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Very useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis. Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.
Filtry jakościowe Grade 4
Grade Grade 4 
Grade Type Standard 
Diameter 270 mm
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 Air Flow Rate 4 s/100 ml/in2
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 
Application Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical. 
Product Product Name Format Dimensions
1004-027 Grade 4 Qualitative Filter Paper Standard Grade; circle; 27 mm Circles 27 mm
1004-042 Grade 4 Qualitative Filter Paper Standard Grade; circle; 42.5 mm Circles 42.5 mm
1004-047 Grade 4 Qualitative Filter Paper Standard Grade; circle; 47 mm Circles 47 mm
1004-050 Grade 4 Qualitative Filter Paper Standard Grade; circle; 50 mm Circles 50 mm
1004-055 Grade 4 Qualitative Filter Paper Standard Grade; circle; 55 mm Circles 55 mm
1004-070 Grade 4 Qualitative Filter Paper Standard Grade; circle; 70 mm Circles 70 mm
1004-090 Grade 4 Qualitative Filter Paper Standard Grade; circle; 90 mm Circles 90 mm
1004-110 Grade 4 Qualitative Filter Paper Standard Grade; circle; 110 mm Circles 110 mm
1004-125 Grade 4 Qualitative Filter Paper Standard Grade; circle; 125 mm Circles 125 mm
1004-150 Grade 4 Qualitative Filter Paper Standard Grade; circle; 150 mm Circles 150 mm
1004-185 Grade 4 Qualitative Filter Paper Standard Grade; circle; 185 mm Circles 185 mm
1004-240 Grade 4 Qualitative Filter Paper Standard Grade; circle; 240 mm Circles 240 mm
1004-270 Grade 4 Qualitative Filter Paper Standard Grade; circle; 270 mm Circles 270 mm
1004-320 Grade 4 Qualitative Filter Paper Standard Grade; circle; 320 mm Circles 320 mm
1004-400 Grade 4 Qualitative Filter Paper Standard Grade; circle; 400 mm Circles 400 mm
1004-648 Grade 4 Qualitative Filter Paper Standard Grade; roll; 38 x 114 mm Roll 38 x 114 mm
1004-917 Grade 4 Qualitative Filter Paper Standard Grade; sheet; 460 × 570 mm Sheets 460 x 570 mm (18.11 x 22.45 in)
1004-930 Grade 4 Qualitative Filter Paper Standard Grade; sheet; 580 × 580 mm Sheets 580 x 580 mm (23 x 23 in)
1004-041 Grade 4 Qualitative Filter Paper Standard Grade, 41 mm Circles 41 mm