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Grade 42 Ashless Filter Paper for Instrumental Analysis, 90 mm circle (100 pcs) 1442-090

GR 42 9CM 100/PK
Availability: 75 in stock
SKU: 1442-090
Manufacturer: Cytiva
Pack Size: 100

 

Grade 42 Ashless Filter Paper for Instrumental Analysis, 90 mm circle (100 pcs)

The high-purity Whatman ashless Grade 42 quantitative filter papers are suitable for a wide range of critical analytical filtration procedures for quantitative analysis. Grade 42 filter 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
  • Particularly suitable for gravimetric 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 Grade 42 filters also makes them suitable for processes that require ashing.

Ashless filter papers for gravimetric and instrumental analysis

 
 

Product specifications

Grade 42 Ashless Filter Paper for Instrumental Analysis, 90 mm circle (100 pcs)

GradeGrade 42 
FormatCircles 
TypeAshless 
Typical Particle Retention in Liquid2.5 µm 
Nominal thickness200 µm
Typical water flow rate at 45 psi (3.1 bar)5 ml/min 
Nominal basis weight100 g/m²
Nominal air flow rate96 s/100 mL/in² 
Nominal Ash Content0.007% 
MaterialHigh-quality cotton linters 
Alpha Cellulose Content Min.≥98% 
Typical Trace Element LevelsAluminium 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 
ApplicationDesigned for gravimetric analysis and the preparation of samples for instrumental analysis. For critical gravimetric analysis with the finest particle retention. 
 

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