Cellulose Quantitative Filter Paper, Grade 42, 2.5um, 320mm, Ashless, Very Slow, 100/Pk
GVS SKU: FP320DXS42QANC01

Featuring an ashless quantitative cellulose medium with fine 2.5um nominal particle retention, this 320mm Grade 42 filter paper disc delivers the finest retention level in the standard quantitative series for critical gravimetric work. The hydrophilic cellulose structure captures ultrafine precipitates while a very slow flow rate maximizes analytical accuracy, and the 160um thickness provides a robust depth medium for demanding separations. Each disc is supplied nonsterile in a pack of 100.

Key Cellulose Media Characteristics

• Ashless purity: very low residual ash supports accurate weighing of combusted samples and processes that require ashing.
• Fine nominal retention: approximately 2.5um retention captures fine and colloidal precipitates such as barium sulfate and metastannic acid.
• Hydrophilic structure: high-purity cellulose readily wets out with aqueous samples for consistent filtration.
• Very slow flow: the dense matrix prioritizes maximum particle retention over speed to minimize particle loss.
• Depth medium: 160um nominal thickness retains particulates throughout the matrix for high gravimetric precision.

Key Construction Characteristics

• Material: high-purity ashless cellulose filter paper.
• Format: 320mm diameter circle for large funnel and gravity or low suction filtration.
• Grade: Grade 42, the finest retention quantitative grade.
• Pack: 100 discs per pack, nonsterile.

This filter paper maintains reliable retention of extremely small particulates across critical analytical procedures, helping preserve sample integrity in gravimetric and instrumental workflows. The combination of fine retention and ashless purity makes it well suited to trace-level analysis where background contamination must be minimized.

Diameter

320mm

Flow Speed

Very Slow

Grade

42

Material

Cellulose

Nominal Thickness (µm)

160

Pack Count

100

Particle Retention

2.5 um

Pore Size (µm)

2.5

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wettability

Hydrophilic

Whatman Equivalent

Grade 42

• Critical Gravimetric Analysis Captures the finest precipitates for accurate quantitative determination by weight.
• Fine Precipitate Collection Retains colloidal precipitates such as barium sulfate, metastannic acid, and finely precipitated calcium carbonate.
• Sample Preparation for Instrumental Analysis Removes fine particulates before AAS, ICP, and ICP-MS to protect instrumentation.
• Ashing Procedures Low ash content supports processes that require combustion of the filter and retained solids.
• Environmental Sample Filtration Separates fine solid matter from aqueous extracts in soil and water analysis.
• Trace-Level Analysis Supports analytical procedures sensitive to very low levels of background contamination.