Grade 42 Ashless Filter Paper for Instrumental Analysis

GE’s 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

Ashless paper for gravimetric and instrumental analysis

Whatman Grade 42 quantitative papers from GE Healthcare’s Life Sciences business 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 GE’s Grade 42 filters also makes them suitable for processes that require ashing.

Grade 42: 2.5 µm

Specifications:

• Grade: Grade 42
• Format: Circles/Sheet
• Type: Ashless
• Typical Particle Retention in Liquid: 2.5 µm
• Typical Water Flow Rate (ml/min) for 9cm diameter: 5
• Nominal Thickness: 200 µm
• Nominal Basis Weight: 100 g/m²
• Nominal Air Flow Rate: 96s/100mL/in²
• 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

Ordering Information: