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Whatman Quantitative Filter Papers, Hardened Low Ash Grades, Grade 50, GE Healthcare


1450-916 1450-110 1450-055 1450-320 1450-993 1450-125 1450-500 1450-090 1450-070 1450-150 1450-240 1450-185 1450-042 1450-917
GE’s thinnest Whatman brand hardened filter paper, highly glazed Grade 50 supports vacuum filtration in Büchner funnels or Hirsch funnels and enables strong retention of very fine crystalline precipitates.

  • Thinner filter design (average thickness 115 µm) than most Büchner filter papers
  • Acid-treated for high wet-strength and chemical resistance
  • Nominal particle retention of 2.7 µm
  • Slow flow rates (Herzberg filtration speed 2685 s)
  • High purity and low ash content (0.015% ash maximum)
  • Compatible with Hirsch or Büchner funnels

GE offers three grades of hardened low ash filters. All three are designed for use in Hirsch and Büchner funnel applications and can be customized for an exact fit.

For many vacuum filtration applications, a thin filter paper with a slow flow rate and excellent wet strength can maintain sample quality and purity. Because Grade 50 thin filter papers are hardened to minimize fiber shredding, they are a good choice for use as carriers in integrated circuits.

Wet-strengthened filters for vacuum filtration. Grade 50 thin filter paper from GE Healthcare’s Life Sciences business is very strong when wet. It will withstand wet handling and precipitate removal by scraping.



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Description Size Material Dimensions Type Supplier No. Catalog Number Unit List Price Quantity
Grade 50 Filter for Quantitative Analysis, Thin, 42.5 mm circle 100 Pieces High-quality cotton linters 42.5 mm Hardened low ash 1450-042 1450-042 Pack of 100 Retrieving


Thickness 115 µm (nominal)
Particle Retention 2.7 µm (Particle retention rating at 98% efficiency), in liquid max.
Filtration Speed 2685 s (Herzberg)
Airflow Rate 144 s/100 mL/in²
Tensile Strength 84 N/15 mm, Tensile M/D Dry
Basis Weight 96 g/m²
Flow Rate Slow
Recommended Flow Rate 10 mL/min (Water)
Burst Strength 0.627 bar, wet burst; 2.275 bar, dry burst
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