Filtry ilościowe bezpopiołowe Grade 44
Papier ilościowy Whatman™ Grade 44 jest cieńszą wersją papieru bezpopiołowego Grade 42. Dzięki zmiejszeniu grubości, zmniejsza się ogólną zawartość popiołu, co sprawia, że papier Grade 44 doskonale nadaje się do analiz zależnych od niskiej zawartości popiołu.
Whatman™ Grade 44 quantitative paper is a thin version of Grade 42 ashless paper. The thinness reduces the overall ash content, making Grade 44 well suited for analyses relying on ash-free dry weight.

• Accurate ash free dry mass measurements
• Fine nominal particle retention rating of 3 µm
• Filtration speed (Herzberg 995 s)
• Typical thickness of 180 µm

We offer other ashless grades with different particle retention ratings, as well as hardened ashless grades to ensure accurate measurement during analyses of samples that are strongly acidic/alkali.

Fast gravimetric analysis of fine particles
Gravimetric analysis can be time-consuming when filtration of fine particles is required. Because of its reduced thickness, Grade 44 ashless filter paper provides faster filtration of fine particles when compared with thicker papers of similar retention rating, such as Whatman™ Grade 42 paper.
Filtry ilościowe bezpopiołowe Grade 44
Grade Grade 44 
Type Ashless 
Typical Particle Retention in Liquid 3 µm 
Nominal Thickness 176 µm
Typical water flow rate 11 ml/min 
Nominal Basis Weight 80 g/m2
Nominal Air Flow Rate 56 s/100 mL/in2
Nominal Ash Content 0.007% 
Material High-quality cotton linters 
Alpha Cellulose Content Min. ≥98% 
Typical Trace Element Levels Aluminium 2.5 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 8.3 µg/g Chromium 1.5 µg/g Copper 2 µg/g Iron 12 µg/g Lead <0.5 µg/g Magnesium 4 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 2.3 µg/g Silicon 6.2 µg/g Sodium 16.8 µg/g Zinc 64.5 µg/g 
Application Designed for gravimetric analysis and the preparation of samples for instrumental analysis. 
Product Product Name Dimensions
1444-070 Grade 44 Ashless Filter Paper; Thin; 70 mm circle (100 pcs) 70 mm
1444-090 Grade 44 Ashless Filter Paper; Thin; 90 mm circle (100 pcs) 90 mm
1444-110 Grade 44 Ashless Filter Paper; Thin; 110 mm circle (100 pcs) 110 mm
1444-125 Grade 44 Ashless Filter Paper; Thin; 125 mm circle (100 pcs) 125 mm
1444-150 Grade 44 Ashless Filter Paper; Thin; 150 mm circle (100 pcs) 150 mm
1444-185 Grade 44 Ashless Filter Paper; Thin; 185 mm circle (100 pcs) 185 mm
1444-240 Grade 44 Ashless Filter Paper; Thin; 240 mm circle (100 pcs) 240 mm
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