Whatman Grade 42 Qualitative Filter Paper Circles 42.5 mm, 1442-042 - New 100 Pk

$19.50
New in sealed package. Each pack contains 100 sheets.

The Whatman 1442-042 is a Grade 42 Ashless Quantitative Filter Paper Circle, 42.5mm in diameter, designed for critical gravimetric analysis with fine 2.5 µm particle retention, featuring a 100 g/m² basis weight, 200 µm thickness, very low ash (<0.007%), and slow 1870-second Herzberg filtration speed for capturing fine precipitates like barium sulfate.
Specifications
  • Product Code: 1442-042
  • Grade: 42 (Ashless Quantitative)
  • Format: Circles (Discs)
  • Diameter: 42.5 mm (4.25 cm)
  • Material: High-purity cotton linters (cellulose)
  • Particle Retention (Liquid): 2.5 µm (finest retention of cellulose papers)
  • Basis Weight: 100 g/m²
  • Thickness: 200 µm
  • Ash Content: ≤ 0.007% (maximum)
  • Filtration Speed (Herzberg): 1870 seconds
  • Wet Burst Strength: 0.40 psi
  • Quantity: 100 circles per pack 
Common Uses:
  • Critical gravimetric analysis
  • Sample preparation for instrumental analysis
  • Filtering fine precipitates like barium sulfate or calcium carbonate