Grade 42 Ashless Filter Paper for Instrumental Analysis, Circle & Sheet

Description

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 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.

Parameter	Grade 42 Ashless Filter Paper for Instrumental Analysis, Circle & Sheet
Grade :	Grade 42
Grade Type :	Ashless
Typical Particle Retention in Liquid¹ :	2.5 µm
Nominal Thickness :	200 µm
Typical water flow rate² :	5 ml/min
Nominal Basis Weight :	100 g/m²
Nominal Air Flow Rate :	96 s/100 mL/in²
Nominal Ash Content³ :	0.007%
Material :	High-quality cotton linters
Alpha Cellulose Content Min. :	≥98%
Typical Trace Element Levels:	Aluminium 2.5 µg/g Antimony less than 0.5 µg/g Arsenic less than 0.5 µg/g Barium less than 0.5 µg/g Boron less than 1 µg/g Calcium 8.3 µg/g Chromium 1.5 µg/g Copper 2 µg/g Iron 12 µg/g Lead less than 0.5 µg/g Magnesium 4 µg/g Manganese less than 0.5 µg/g Mercury less than 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.
Format & Dimensions :	Circle – Ø42.5 mm, Ø47 mm, Ø55 mm, Ø70 mm, Ø90 mm, Ø110 mm, Ø125 mm, Ø150 mm, Ø185 mm, Ø240 mm, Ø320 mm Sheet – 25.4 x 90 mm, 460 x 570 mm, Flag sheet
Pack Size :	100 pieces