Quantitative Ashless Filter Paper Discs, Grade 42, 2um Retention, 90mm, Very Slow, 100/Pk
GVS SKU: FP090DXS42QANC01

Featuring a high-purity cellulose depth medium engineered for ultrafine particle capture, these quantitative ashless filter paper discs deliver the finest retention in the quantitative grade series for critical gravimetric work. Each 90mm Grade 42 disc provides a nominal 2um particle retention with a very slow flow rate, trading filtration speed for the maximum precision required when even minor particle loss skews analytical results. The low ash cellulose construction keeps background contamination to a minimum, making these discs well suited to ignition-based and instrumental methods. Discs are supplied 100 per pack.

Key Cellulose Media Characteristics

• Nominal 2um particle retention captures extremely fine precipitates and colloidal solids that pass through coarser grades.
• Very slow flow rate maximizes retention efficiency for high-precision gravimetric determinations.
• Low ash content cellulose minimizes inorganic residue, supporting accurate weight measurements in combusted samples.
• Pure cellulose fiber matrix combines low background contamination with the mechanical integrity needed for precipitate transfer.
• Suited to difficult filtrations of cloudy suspensions and finely divided precipitates such as barium sulfate and metastannic acid.

Key Construction Characteristics

• Grade 42 quantitative ashless cellulose filter paper.
• 90mm diameter disc format for funnel and Buchner filtration.
• Nominal thickness of 160um.
• Hydrophilic, nonsterile, supplied 100 per pack.

These discs maintain consistent particle capture across the full filtration area, helping preserve sample integrity through demanding quantitative procedures. The low ash cellulose reduces the blank corrections that gravimetric methods would otherwise require, delivering reliable, reproducible results for critical analytical filtration.

Diameter

90mm

Flow Speed

Very Slow

Folded/ Fluted/ Pleated

Disc

Grade

Grade 42

Material

Cellulose

Nominal Ash Content (%)

<0.007

Nominal Thickness (µm)

160

Pack Count

100

Particle Retention

2 µm

Pore Size (µm)

2

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wettability

Hydrophilic

Whatman Equivalent

Grade 42

• Critical Gravimetric Analysis The fine 2um retention captures ultrafine precipitates such as barium sulfate and metastannic acid for accurate gravimetric determinations.
• Instrumental Sample Preparation Removes fine particulates ahead of ICP, ICP-MS, and AAS analysis to protect sensitive instrumentation from interference.
• Ashing Procedures Low ash cellulose makes these discs suitable for ignition-based methods where filter mass would otherwise affect results.
• Difficult Clarifications Very slow flow and high retention clarify cloudy suspensions and liquids that are hard to filter.
• Environmental Analysis Supports soil and water analysis where solids must be separated from aqueous extracts with minimal contamination.
• Cement and Mineral Testing Used for calcium carbonate and other fine inorganic precipitate determinations in industrial QC labs.