Qualitative Filter Paper Discs, Grade 91, 320mm, 34-42um Retention, Very Fast, 100/Pk
GVS SKU: FP320DME91QALC01

Featuring a creped cellulose medium with a very fast flow rate, this Grade 91 general purpose qualitative filter paper delivers efficient clarification for less critical, routine laboratory analysis. Each 320mm circle provides a 34 to 42 micron particle retention range, a nominal thickness of 160 micrometers, and a basis weight of 65 g/m2, with a low ash content of under 0.1 percent. The creped surface increases the effective filtration area and helps maintain rapid throughput across general-purpose separations.

Key Qualitative Filter Paper Characteristics

• Very fast, creped flow: The creped surface promotes a very fast filtration rate suited to high-volume, routine work.
• Particle retention: Retains particles in the 34 to 42 micron range for general clarification of liquids.
• Low ash content: Ash content of less than 0.1 percent supports cleaner filtrates in qualitative procedures.
• Defined thickness and weight: 160 micrometer nominal thickness and 65 g/m2 basis weight provide consistent, repeatable performance.
• Hydrophilic cellulose: Naturally wettable medium accepts aqueous samples without pretreatment.

Key Construction Characteristics

• Format: Precut 320mm diameter circles for funnel and Buchner filtration.
• Grade: Qualitative Grade 91 general purpose filter paper.
• Pack: Supplied 100 discs per pack, nonsterile.

This filter paper provides reliable, repeatable clarification for routine laboratory separations where fine particle collection is not critical. The very fast creped medium maintains rapid throughput while supporting sample integrity. Consistent thickness, weight, and retention deliver dependable results across applications such as sucrose assays and general pharmaceutical and food laboratory filtration.

Diameter

320mm

Dimensions

320mm Circle

Flow Speed

Very Fast/Creped

Grade

Qualitative Grade 91

Material

Cellulose

Nominal Ash Content (%)

<0.1

Nominal Basis Weight (g/ m²)

65

Nominal Thickness (µm)

160

Pack Count

100

Particle Retention

34-42 um

Pore Size (µm)

42

Qualitative/ Quantitative

Qualitative

Sterility

Nonsterile

Wettability

Hydrophilic

Whatman Equivalent

Grade 91

• Routine Liquid Clarification Removes coarse particulates from sample liquids at a very fast rate for general, less critical laboratory analysis.
• Sucrose Assays Widely used to assay sugar in cane sugar and beet sugar laboratory workflows.
• Pharmaceutical Routine Filtration Supports routine filtration tasks in pharmaceutical laboratories where fine particle retention is not critical.
• Food and Beverage Analysis Separates solid foodstuffs from associated liquids during sample preparation.
• General Laboratory Separations Handles high-volume, routine separations using large 320mm circles in funnels and Buchner setups.
• Education and Teaching Labs Provides an economical, fast-flowing medium for instructional filtration exercises.