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L – Suitable for gravity or low suction filtration. Care must be taken to prevent rupture of paper
M – Will withstand all normal use on Buchner Funnels or others devices under suction or moderate pressure
H – High wet strength and high chemical resistance
Grade No
Flow rate
Retention microns
Wet Strength
Thickness, mm
Ash %
4
Excellent retention of coarse and gelatinous precipitates
Fast
20-25
L
0.21
0.06
Available Sizes:
Circles: 27 mm to 400 mm (available prepleated)
Sheets: 38 x 114 mm to 580 x 580 mm
Properties
Particle retention1: 25µm
Nominal thickness: 210 µm
Nominal basis weight: 92 g/m2
Nominal ash content2: 0.06%
Applications
Grade 4 is a fast filter material that is well suited for retention of coarse particles and gelatinous precipitates, such as ferric hydroxide and aluminum hydroxide. Specific applications include:
Air pollution monitoring where the collection of fine particles is not critical
Routine clean-up of biological fluids or organic extracts
