Filtry ilościowe bezpopiołowe, wzmocnione, Grade 540

Filtry Grade 540 są papierami celulozowymi o wysokiej czystości, rafinowane kwasem. Odporne na działanie czynników mechanicznych filtry Grade 540 są odpowiednie dla analizy ilościowej lub grawimetrycznej próbek silnie kwasowych lub zasadowych.
Whatman Grade 540 is a high-purity, acid-treated cellulose lab filter paper. Mechanically strong Grade 540 is well suited for quantitative or gravimetric analysis of strongly acidic or alkaline samples.

• Acid-treated for high wet-strength
• Extremely low ash content (0.006% ash maximum)
• Nominal particle retention of 8 µm
• Medium flow rate (Herzberg filtration speed 200 s)
• High chemical resistance to strong acid and alkali suspensions

We offer hardened ashless filter paper for a variety of precipitate sizes. Along with general filtration Grade 540, the range includes Grade 542 for retention of fine precipitates and Grade 541 for fast filtration. All three grades are designed for use in gravimetric analysis.

Gravimetric analysis of acid and alkali suspensions
Whatman hardened, ashless Grade 540 lab filter paper is frequently used as a gravimetric filter during analysis of metals in acidic or alkaline solutions and in the collection of hydroxides. The acid-treated surface prevents tearing during filtration and allows the user to scrape precipitates from the paper.
Grade Grade 540 
Type Hardened Ashless 
Typical Particle Retention in Liquid 8 µm 
Nominal Thickness 160 µm
Typical water flow rate 97 ml/min 
Nominal Basis Weight 85 g/m2
Nominal Air Flow Rate 13 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 Frequently used in the gravimetric analysis of metals in acid/alkali solutions and in collecting hydroxides after precipitation by strong alkalis. 
Product Product Name Diameter
1540-042 Grade 540 Ashless General Lab Filter Paper; 42.5 mm circles (100 pcs) 42.5 mm
1540-055 Grade 540 Ashless General Lab Filter Paper; 55 mm circles (100 pcs) 55 mm
1540-090 Grade 540 Ashless General Lab Filter Paper; 90 mm circles (100 pcs) 90 mm
1540-110 Grade 540 Ashless General Lab Filter Paper; 110 mm circles (100 pcs) 110 mm
1540-125 Grade 540 Ashless General Lab Filter Paper; 125 mm circles (100 pcs) 125 mm
1540-150 Grade 540 Ashless General Lab Filter Paper; 150 mm circles (100 pcs) 150 mm
1540-185 Grade 540 Ashless General Lab Filter Paper; 185 mm circles (100 pcs) 185 mm
1540-240 Grade 540 Ashless General Lab Filter Paper; 240 mm circles (100 pcs) 240 mm
1540-320 Grade 540 Ashless General Lab Filter Paper; 320 mm circles (100 pcs) 320 mm
1540-321 Grade 540 Ashless General Lab Filter Paper; 21 mm circles (100 pcs) 21 mm
1540-324 Grade 540 Ashless General Lab Filter Paper; 24 mm circles (100 pcs) 24 mm