Cellulose Qualitative Filter Paper Discs, Grade 05, 90mm, Very Slow, Low Ash, 100/Pk
GVS SKU: FP090DXS05QALC01

Featuring a low ash cellulose medium made from refined pulp and pure cotton linters with an alpha-cellulose content of nearly 100%, this 90mm qualitative filter paper disc delivers very slow filtration with high retention of extra fine particles. The Grade 05 medium provides a nominal retention rating in the 3 micron range, making it suited to the most difficult clarifications and the capture of finely divided precipitates. Each disc measures 90mm in diameter, and discs are supplied 100 per pack.

Key Cellulose Media Characteristics

• Manufactured from refined pulp and pure cotton linters with an alpha-cellulose content of nearly 100% for consistent, diverse filtration properties.
• Low ash content of less than 0.06% that is not reduced by post-treatment, minimizing contamination of filtrates and recovered solids.
• Hydrophilic structure that wets readily with aqueous samples for predictable flow.
• Very slow flow rate paired with high retention for capturing extra fine-grained precipitates.
• Enhanced mechanical strength suited to Buchner funnels and filtration under pressure.

Key Construction Characteristics

• Cellulose qualitative filter paper in a 90mm diameter disc format.
• Grade 05, the very slow flow grade in the qualitative range.
• Nonsterile, supplied 100 discs per pack.
• Nominal retention in the 3 micron range for fine particle and precipitate capture.

This disc delivers reliable, repeatable separation for demanding qualitative work where fine precipitates and turbid samples must be cleanly retained. The low ash, high purity cellulose helps preserve sample integrity, while the very slow flow maximizes retention of extra fine particulates. The result is dependable clarification across challenging laboratory filtrations.

Color

White

Diameter

90mm

Flow Speed

Very Slow

Grade

05

Material

Cellulose

Mesh Format

Circle

Nominal Ash Content (%)

<0.06

Nominal Thickness (µm)

170

Pack Count

100

Particle Retention

3 um (nominal)

Pore Size (µm)

3

Qualitative/ Quantitative

Qualitative

Sterility

Nonsterile

Wettability

Hydrophilic

• Fine Precipitate Filtration Captures extra fine-grained precipitates such as barium sulphate and cupreous oxide where high retention is required.
• Difficult Clarifications The very slow flow and high retention handle turbid or hard-to-filter suspensions that pass through coarser grades.
• Wine Clarification Often specified for clarifying wine and similar beverages requiring removal of very fine particulates.
• Water and Soil Analysis Serves as a clarifying filter for cloudy suspensions in environmental water and soil sample preparation.
• Gravimetric Sample Prep Low ash content supports qualitative gravimetric workflows by minimizing contamination of retained solids.
• Pressure and Buchner Filtration Mechanical strength supports use in Buchner funnels and filtration under pressure.