Filtry ilościowe bezpopiołowe, wzmocnione, Grade 541
Papier filtracyjny Grade 541, rafinowany kwasem. Charakteryzuje się podwyższoną wytrzymałością w stanie mokrym, wysoką odpornością chemiczną i dużą retencją cząstek, przeznaczony do szybkiej filtracji analitycznej.
Whatman™ Grade 541 acid hardened cellulose filter paper features high wet-strength, high chemical resistance, and a large nominal particle retention for fast analytical filtration.

• High wet-strength
• High chemical resistance to strong acid and alkali suspensions
• Retention of gelatinous precipitate
• 22 µm nominal particle retention rating
• Fast flow rate (Herzberg filtration speed 34 s)
• Maximum of 0.006% ash concentration

Along with fast Grade 541 filter paper, the hardened, ashless range includes general-purpose Grade 540 and Grade 542 for fine particle retention. All three paper grades are appropriate for use in gravimetric analysis with strong acids and alkali samples.

Gelatinous precipitate retention
Hardened ashless filter paper is recommended when fast filtration of a gelatinous precipitate for gravimetric analysis is performed on a strongly acidic or alkali solution. Applications of Grade 541 papers include:

• Use as an animal foodstuff filter for determining fiber content
• Determination of gelatin content in milk and cream
• Quantification of chloride in cement, as well as chloride and phosphorous in coal and coke
Filtry ilościowe bezpopiołowe, wzmocnione, Grade 541
Grade Grade 541 
Type Hardened Ashless 
Typical Particle Retention in Liquid 22µm 
Nominal Thickness 155 µm
Typical water flow rate 359 ml/min 
Nominal Basis Weight 78 g/m2
Nominal Air Flow Rate 3 s/100 mL/in2
Nominal Ash Content 0.005% 
Material High-quality cotton linters 
Alpha Cellulose Content Min. ≥98% 
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 Typical applications include fiber in animal foodstuffs; gelatine in milk and cream; chloride in cement; and chloride and phosphorous in coal and coke. 
Product Product Name Dimensions
1541-042 Grade 541 Ashless Fast Filter Paper; 42.5 mm circles (100 pcs) 42.5 mm
1541-047 Grade 541 Ashless Fast Filter Paper; 47 mm circles (100 pcs) 47 mm
1541-055 Grade 541 Ashless Fast Filter Paper; 55 mm circles (100 pcs) 55 mm
1541-070 Grade 541 Ashless Fast Filter Paper; 70 mm circles (100 pcs) 70 mm
1541-090 Grade 541 Ashless Fast Filter Paper; 90 mm circles (100 pcs) 90 mm
1541-110 Grade 541 Ashless Fast Filter Paper; 110 mm circles (100 pcs) 110 mm
1541-125 Grade 541 Ashless Fast Filter Paper; 125 mm circles (100 pcs) 125 mm
1541-150 Grade 541 Ashless Fast Filter Paper, 150 mm circles (100 pcs) 150 mm
1541-185 Grade 541 Ashless Fast Filter Paper; 185 mm circles (100 pcs) 185 mm
1541-240 Grade 541 Ashless Fast Filter Paper; 240 mm circles (100 pcs) 240 mm
1541-270 Grade 541 Ashless Fast Filter Paper; 270 mm circles (100 pcs) 270 mm
1541-320 Grade 541 Ashless Fast Filter Paper; 320 mm circles (100 pcs) 320 mm
1541-400 Grade 541 Quantitative Filter Paper Hardened Ashless; circle; 400 mm 400 mm
1541-917 Grade 541 Ashless Fast Filter Paper; sheet; 460 × 570 mm sheet (100 pcs) 460 x 570 mm