Filtry ilościowe bezpopiołowe Grade 42

Filtry Grade 42 wykazują się retencją najdrobniejszych cząstek spośród wszystkich bezpopiołowych papierów filtracyjnych Whatman. Przeznaczone są do analizy grawimetrycznej i przygotowania próbek do analizy instrumentalnej.
Whatman Grade 42 quantitative papers have the finest retention of all Whatman ashless filter paper grades. Grade 42 is designed for gravimetric analysis and sample preparation for instrumental analysis.

• Ashless: 0.007% ash maximum
• Fine (2.5 µm) nominal particle retention rating, eliminates large particles that might otherwise interfere with sensitive instrumentation
• Herzberg filtration speed of 1870 s
• Commonly used as a calcium carbonate filter

Whatman quantitative papers come in a variety of particle retentions. Also see hardened ashless grades for work with strong acids or bases.

Ashless paper for gravimetric and instrumental analysis
Whatman Grade 42 quantitative papers are designed for retention of extremely small particles. A common example is use of Grade 42 as a calcium carbonate filter for analysis in the cement industry.

Other typical precipitates for gravimetric analysis include barium sulfate and metastannic acid for use in glazes, coatings, and pigments. The high purity of Whatman Grade 42 filters also makes them suitable for processes that require ashing.
Grade Grade 42 
Type Ashless 
Typical Particle Retention in Liquid 2.5 µm 
Nominal Thickness 200 µm
Typical water flow rate 5 ml/min 
Nominal Basis Weight 100 g/m2
Nominal Air Flow Rate 96 s/100 mL/in
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. For critical gravimetric analysis with the finest particle retention. 
Product Product Name Dimensions
1442-042 Grade 42 Ashless Filter Paper for Instrumental Analysis; 42.5 mm circle (100 pcs) 42.5 mm
1442-047 Grade 42 Ashless Filter Paper for Instrumental Analysis; 47 mm circle (100 pcs) 47 mm
1442-055 Grade 42 Ashless Filter Paper for Instrumental Analysis; 55 mm circle (100 pcs) 55 mm
1442-070 Grade 42 Ashless Filter Paper for Instrumental Analysis; 70 mm circle (100 pcs) 70 mm
1442-090 Grade 42 Ashless Filter Paper for Instrumental Analysis; 90 mm circle (100 pcs) 90 mm
1442-110 Grade 42 Ashless Filter Paper for Instrumental Analysis; 110 mm circle (100 pcs) 110 mm
1442-125 Grade 42 Ashless Filter Paper for Instrumental Analysis; 125 mm circle (100 pcs) 125 mm
1442-150 Grade 42 Ashless Filter Paper for Instrumental Analysis; 150 mm circle (100 pcs) 150 mm
1442-185 Grade 42 Ashless Filter Paper for Instrumental Analysis; 185 mm circle (100 pcs) 185 mm
1442-240 Grade 42 Ashless Filter Paper for Instrumental Analysis; 240 mm circle (100 pcs) 240 mm
1442-320 Grade 42 Ashless Filter Paper for Instrumental Analysis; 320 mm circle (100 pcs) 320 mm
1442-6551 Grade 42 Quantitative Filter Paper Ashless (Ash 0.007%); sheet; 25.4 × 90 mm 25.4 x 90 mm
1442-917 Grade 42 Ashless Filter Paper for Instrumental Analysis; 460 × 570 mm sheet (100 pcs) 460 x 570 mm