Filtry ilościowe bezpopiołowe, wzmocnione, Grade 542
Filtry Grade 542 są wzmacniane poprzez rafinację kwasem, dzięki czemu możliwa jest retencja dużych ilości drobnych osadów w aplikacjach takich jak oznaczanie metali i wytrącanie osadów wodorotlenków.
Whatman™ Grade 542 filters are acid hardened to allow high retention of fine precipitates in applications such as metal determinations and hydroxide collection.

• High wet-strength
• Acid-hardened for resistance to strong acid and alkali solutions
• Nominal particle retention rating of 2.7 µm
• Herzberg filtration speed of 2510 s
• Extremely low ash content (0.006% ash maximum)

Along with Grade 542 cellulose filter paper, the Whatman™ range of hardened quantitative papers from includes fast Grade 541 and general-purpose Grade 540 filters. All three grades are designed for use in quantitative analysis with strong acid/alkali solutions.

Slow flow rate filters for gravimetric determination
Hardened Grade 542 quantitative papers enable high retention of fine particles in chemically harsh conditions. When acting as a gravimetric filter, this cellulose filter paper is therefore well suited for use in capturing fine precipitates in applications such as metal determinations and hydroxide collection.
Filtry ilościowe bezpopiołowe, wzmocnione, Grade 542
Grade Grade 542 
Type Hardened Ashless 
Typical Particle Retention in Liquid 2.7 µm 
Nominal Thickness 150 µm
Typical water flow rate 13 ml/min 
Nominal Basis Weight 96 g/m2
Nominal Air Flow Rate 64 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 Used in gravimetric metal determinations. 
Product Product Name Diameter
1542-055 Grade 542 Ashless Fine Precipitate FIlter; 55 mm circles (100 pcs) 55 mm
1542-070 Grade 542 Ashless Fine Precipitate FIlter; 70 mm circles (100 pcs) 70 mm
1542-090 Grade 542 Ashless Fine Precipitate FIlter; 90 mm circles (100 pcs) 90 mm
1542-110 Grade 542 Ashless Fine Precipitate FIlter; 110 mm circles (100 pcs) 110 mm
1542-125 Grade 542 Ashless Fine Precipitate FIlter; 125 mm circles (100 pcs) 125 mm
1542-150 Grade 542 Ashless Fine Precipitate FIlter; 150 mm circles (100 pcs) 150 mm
1542-185 Grade 542 Ashless Fine Precipitate FIlter; 185 mm circles (100 pcs) 185 mm
1542-240 Grade 542 Ashless Fine Precipitate FIlter; 240 mm circles (100 pcs) 240 mm
1542-400 Grade 542 Quantitative Filter Paper Hardened Ashless; circle; 400 mm 400 mm