Cellulose Quantitative Filter Paper, 125mm, 2-3um Retention, Very Slow, Ashless, Grade 42, 100/Pk
GVS SKU: FP125DXS42QANC01

Featuring a high-purity ashless cellulose medium, this 125mm quantitative filter paper disc delivers the finest particle retention in the quantitative grade range for critical gravimetric analysis. With a very slow flow rate and a nominal particle retention range of 2 to 3 microns, it captures extremely fine precipitates that coarser papers allow to pass. The Grade 42 (DXS42) construction provides a 160um thickness and high mechanical strength suited to demanding analytical filtration.

Key Cellulose Filter Paper Characteristics

• Ashless quantitative grade manufactured from high-purity cellulose for accurate weight measurements where filter residue affects results.
• Fine particle retention in the 2 to 3 micron range, the finest retention level among the quantitative grades, for capturing colloidal and finely dispersed precipitates.
• Very slow flow rate that trades speed for maximum retention and analytical accuracy on difficult, fine particulate samples.
• Enhanced mechanical strength with a wet bursting strength of 52 kPa, supporting filtration under gravity, low suction, and Buchner funnel use.
• 160um nominal thickness providing controlled fiber density for consistent precipitate capture across the disc.

Key Construction Characteristics

• Material: high-purity cellulose, ashless quantitative formulation.
• Format: 125mm diameter circle disc.
• Grade: Grade 42 (DXS42), very slow filtration speed.
• Nonsterile, supplied 100 discs per box.

This filter paper maintains reliable, reproducible retention from center to edge, supporting accurate quantitative determinations and sample integrity. Its smooth surface aids complete precipitate recovery during transfer, while the ashless formulation provides the low background needed for ignition-based methods.

Diameter

125mm

Flow Speed

Very Slow

Grade

Grade 42 (DXS42)

Material

Cellulose

Membrane Thickness (µm)

160

Mesh Format

Circle

Nominal Thickness (µm)

160

Pack Count

100

Particle Retention

2-3 µm

Pore Size (µm)

2-3

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wettability

Hydrophilic

Whatman Equivalent

Grade 42

• Critical Gravimetric Analysis Captures fine precipitates such as barium sulfate and finely precipitated calcium carbonate for accurate quantitative weight determinations.
• Instrumental Sample Preparation Clarifies samples by removing extremely small particulates that could interfere with sensitive analytical instrumentation.
• Ashing Procedures Provides an ultra-low ash blank for ignition-based methods where filter residue must not affect final sample mass.
• Cement and Geological Testing Serves as a calcium carbonate filter for gravimetric analysis in cement, raw material, and geological sample workflows.
• Colloidal Precipitate Collection Retains precipitates with tendencies toward colloidal dispersion, including metastannic acid, for pigment and coating analysis.
• Environmental and Soil Analysis Separates solid matter from aqueous extracts during soil and environmental filtration procedures.