Whatman 无灰级定量滤纸 Grade 44   
  • 品牌 : Whatman

  • 产品分类:滤纸


GE’s Whatman Grade 44 quantitative paper is a thin version of Grade 42 ashless paper. The thinness reduces the overall ash content, making Grade 44 well suited for analyses relying on ash-free dry weight.

Accurate ash free dry mass measurements
Fine nominal particle retention rating of 3 µm
Filtration speed (Herzberg 995 s)
Typical thickness of 180 µm
GE Healthcare’s Life Sciences business offers other ashless grades with different particle retention ratings, as well as hardened ashless grades to ensure accurate measurement during analyses of samples that are strongly acidic/alkali.

Fast gravimetric analysis of fine particles
Gravimetric analysis can be time-consuming when filtration of fine particles is required. Because of its reduced thickness, Grade 44 ashless filter paper from GE provides faster filtration of fine particles when compared with thicker papers of similar retention rating, such as Whatman Grade 42 paper.

Looking for a filter paper, membrane filter, or syringe filter? Let GE help you find the optimal filter for your needs to ensure reliable analysis.


 
PRODUCT SPECIFICATIONS
Parameter Grade 44 Ashless Filter Paper, Thin
Grade Grade 44 
Format Circles 
Type Ashless 
Typical Particle Retention in Liquid 1 3 µm 
Nominal thickness 176 µm
Typical water flow rate 2 11 ml/min 
Nominal basis weight 80 g/m²
Nominal air flow rate 56 s/100 mL/in² 
Nominal Ash Content 3 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 
Application Designed for gravimetric analysis and the preparation of samples for instrumental analysis. 
Dimensions Ø ( mm ) 70 / 90 / 110 / 125 / 150 / 185 / 240
1:Particle retention rating at 98% efficiency.
2:For 9 cm diameter
3:Ash is determined by ignition of the cellulose filter at 900°C in air.

 
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