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Quantitative Filter

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작성자최고관리자 댓글 0건 조회 74회 작성일 23-09-06 10:19

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Quantitative Filter Papers - Hardened Low Ash Grades Quantitative Filter Papers - Hardened Low Ash Grades
The maximum ash content of these grades is intermediate between ashless and qualitative grades.

They are particularly suitable for Büchner 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: 2.7 µm
Retention of very fine 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 fibers. 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 fiber shedding is utilized in carriers for integrated circuits.
This grade is also available in Smear Tab format for wipe testing (e.g., testing of surfaces for radionuclide contamination).

Grade 52: 7 µm
The general purpose hardened filter paper with medium retention and flow rate. Very hard surface.

Grade 54: 22 µm
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.

Typical Properties - Quantitative Hardened Low Ash Grades

Grade	Description	Particle Retention in Liquid (µm)	Filtration Speed Herzberg (s)	Ash Content*	Typical Thickness (µm)	Basis Weight (g/m2)
50	Slow	2.7†	2685	0.015	115	97
52	Medium	7†	235	0.015	175	101
54	Very fast	22†	39	0.015	185	92

* Ash is determined by ignition of the cellulose filter at 900°C in air
† Particle retention rating at 98% efficiency

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Quantitative Filter > Whatman

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Quantitative Filter

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Typical Properties - Quantitative Hardened Low Ash Grades