Qualitative Filter Papers Chemistry Lab

Hawach Scientific Co., Ltd qualitative filter paper chemistry lab is divided into standard grade and wet strength grade. The wet strength grade adds a small amount of chemical stabilizer to the standard grade. Wet strengthened grades are with better moisture resistance. The ash content of filter paper is less than 0.1%. Qualitative filter papers cover a wide range of laboratory applications and are frequently used for clarifying liquids. Wet strength filter paper disc exhibits excellent compression resistance under high pressure and vacuum laboratory conditions and is not easily damaged.

Qualitative filter papers generally adopt gravity filtration, which uses filter paper to trap solid-phase particles to separate solid-liquid. Filter paper is usually used in a single layer or multiple layers. Qualitative filter paper chemistry lab has natural mechanical strength and certain toughness.

If you need to speed up the filtering speed, you can fold the filter paper many times (such as stacking two layers of filter paper into a fan shape or a zigzag pattern), which can significantly increase the filtering speed. During air pump filtration, 2-3 layers of filter paper can be stacked in the funnel according to the suction force, or a layer of dense filter cloth can be placed first, and then filter paper can be placed on it for filtration. Qualitative filter paper is also commonly used for cleaning test benches and cleaning various equipment tools in the wiping laboratory.

(1) There are 5 grades of qualitative filter paper, which are:

Filter Paper Disc Grade BIO-1: General purpose in the laboratory.
Filtration Filter Paper Grade BIO-2: Compared with Grade1, it has higher retention capacity and lower filtration speed.
20 Micron Filter Paper Grade BIO-4: The flow rate is high, the retention of larger particles is good, and the colloid can be precipitated.
Chromatography Filter Paper Grade BIO-5: The most effective qualitative filter paper used to collect small particles, with a low flow rate.
Filter Paper Biology Grade BIO-6: Good particle retention capacity, designated for boiler water analysis.

(2) There are 2 grades of wet strengthened qualitative filter paper, which are:

10 Micron Filter Paper Grade BIO-91: Used for daily analysis that is not demanding, worldwide, used to analyze the sucrose content in cane sugar.
Fast Flow Filter Paper Grade BIO-113: High load capacity, fastest flow rate, the thickest filter paper, very high strength, ideal for the analysis of colloidal sediment.

Technical Data of Qualitative Filter Papers Chemistry Lab

GradeParticle RetentionProduct AppearanceFiltration SpeedAsh Content (%)Basis Weight (g/m2)Wet Burst (mm H2O)
BIO-111μmSmoothMedium<0.184>140
BIO-28μmSmoothMedium<0.184>140
BIO-420μmSmoothFast<0.184>120
BIO-52.5μmSmoothSlow<0.184>180
BIO-63.0μmSmoothSlow<0.184>180
GradeSeparating PropertyFiltration SecondsFiltration SpeedAsh Content (%)Pore SizeBasis Weight (g/m2)Wet Burst (mm H2O)
BIO-91PbSO4>35–<70Medium<0.1310μm84>=320
BIO-113Fe(OH)3<35sFast<0.1330μm68>=320
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