Cellulose Quantitative Filter Paper, Ashless, Fast, 20-25um Retention, 185mm, 100/Pk
GVS SKU: FP185DFA41QANC01

Featuring an ashless cellulose medium refined from pure cotton linters with virtually 100% alpha-cellulose content, this 185mm quantitative filter paper delivers fast filtration for demanding gravimetric work. Classified as a fast (DFA41) grade with a nominal particle retention range of 20 to 25um, it captures coarse particles and gelatinous precipitates while maintaining high throughput. With an ash content below 0.007% and a nominal thickness of 190um, it provides the documented low residue and mechanical strength needed for accurate quantitative determinations.

Key Cellulose Media Characteristics

• Ashless purity: ash content below 0.007% minimizes residual mass after ignition for reliable gravimetric analysis.
• Fast flow rate: among the fastest in the ashless range, ideal for high-throughput filtration of heavily loaded samples.
• Coarse retention: nominal 20 to 25um particle retention captures coarse particles and gelatinous precipitates such as iron and aluminum hydroxides.
• High-purity construction: made of refined pulp and pure cotton linters with virtually 100% alpha-cellulose content.
• Naturally hydrophilic: wets readily with aqueous samples for consistent filtration behavior.

Key Construction Characteristics

• Format: 185mm diameter circles supplied 100 per pack.
• Material: ashless cellulose (quantitative grade).
• Nominal thickness: 190um.
• Nominal basis weight: 85 g/m2.
• Sterility: nonsterile.

This quantitative grade maintains consistent filtration speed and reliable particle retention across the full sheet area, supporting reproducible results from sample to sample. Its low ash residue preserves sample integrity through ignition-based procedures, while the high-purity cellulose construction provides the mechanical strength required for vacuum-assisted and Buchner funnel filtration.

Color

White

Diameter

185mm

Flow Speed

Fast

Grade

DFA41

Hardened (Yes/ No)

No

Material

Cellulose

Mesh Format

Circle

Nominal Ash Content (%)

<0.007

Nominal Basis Weight (g/ m²)

85

Nominal Thickness (µm)

190

Pack Count

100

Particle Retention

20-25 µm

Pore Size (µm)

20-25

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wettability

Hydrophilic

Whatman Equivalent

Grade 41

• Gravimetric Analysis The ashless construction with under 0.007% ash content supports accurate weight-based determinations after ignition.
• Coarse Precipitate Filtration The fast 20-25um retention efficiently captures coarse particles and gelatinous precipitates such as iron and aluminum hydroxides.
• Air Pollution Monitoring Used for quantitative air pollution analysis and particle collection at high flow rates for subsequent analysis.
• Environmental Sample Prep Suited to preparing solid environmental samples such as soils and sludges for metals analysis after acid digestion.
• Soil and Foodstuffs Analysis The fast filtration speed supports high-throughput soil testing and food industry separations.
• Vacuum-Assisted Filtration Mechanical strength makes it suitable for fast filtration of difficult coarse or gelatinous samples in Buchner funnels.