whatman Grade 50/52/54/540/541/542硬化無(wú)灰定量濾紙Quantitative Filter Papers - Hardened Low Ash Grades 
(Ash 0.015%) 
The maximum ash content of these grades is intermediate between ashless and 
qualitative grades. They are particularly suitable for Buchner filtrations where 
it is desirable to recover the precipitate from the filter surface after 
filtration. Other characteristics include high wet strength and chemical 
resistance which are similar to the acid hardened ashless filter papers.
Grade 50: 2.7μm 
Retention of finest crystalline precipitates. The thinnest of all Whatman filter 
papers. Slow flow rate. Hardened and highly glazed surface. This finish also 
keeps the paper free from loose surface fibres. Highly suitable for qualitative 
or quantitative filtrations requiring vacuum assistance on Büchner or 3-piece 
filter funnels. Very strong when wet. Will withstand wet handling and 
precipitate removal by scraping. In the electronics industry, the virtual 
absence of fibre shedding is utilised in carriers for integrated circuits.Grade 
52: 7μm 
The general purpose hardened filter paper with medium retention and flow rate. 
Very hard surface. Grade 54: 20-25μm
Very fast filtration for use with coarse and gelatinous precipitates. High wet 
strength makes this grade very suitable for vacuum assisted fast filtration of 
"difficult" coarse or gelatinous precipitates. Grade 540: 8μm 
The general purpose hardened ashless filter paper with medium retention and flow 
rate. Extremely pure and strong with a hard surface. High chemical resistance to 
strong acid and alkali. Frequently used in the gravimetric analysis of metals in 
acid/alkali solutions and in collecting hydroxides after precipitation by strong 
alkalis. Grade 541: 20-25μm 
Fast filtration of coarse particles and gelatinous precipitates in acid/alkali 
solutions during gravimetric analysis. Typical applications include fibre in 
animal foodstuffs, gelatine in milk and cream, chloride in cement, and chloride 
and phosphorous in coal and coke. Grade 542: 2.7μm
High retention of fine particles under demanding conditions. Slow flow rate. 
Very hard and strong with excellent chemical resistance. Often used in 
gravimetric metal determinations.
 
 
Quantitative Filter Papers - Hardened Ashless Grades (Ash 0.006%) 
These are the supreme quantitative filter papers featuring high wet strength and 
chemical resistance. These papers are acid hardened, which reduces ash to an 
extremely low level. Their tough surfaces make them suitable for a wide range of 
critical analytical filtration operations. Each grade offers a convenient 
combination of filtration speed and particle retention.
 
 
 
      Standard Circle Filter Funnel Volumes
      The maximum practical volume of the most popular disc sizes (quadrant 
      folded) are:
      Diameter (mm)Volume (mL)
      9015
      11020
      12535
      15075
      185135
      240300

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