Whatman
Grade 50 Filter Paper, Thin, 63.5 mm Circle, 100/Pk SKU: 1450-063

Quantitative Ashless Filter Paper - 1450-063

Regulatory laboratories performing routine gravimetric assays need ashless paper with certificates of analysis documenting compliance with method specifications. Fine fiber matrix delivers the mechanical integrity needed to transfer collected precipitates from funnel to crucible without loss. As a result, certificate of conformance documentation accompanies each lot, providing traceability for quality systems and regulatory audit requirements.

Key Filter Paper Characteristics

• Acid washing process removes metallic contaminants that could interfere with trace element determinations after ignition.
• Ashless filter paper provides the documented low residue needed for ignition-based analytical procedures where filter mass affects results.
• Hardened construction withstands aggressive solvents and concentrated acids that would compromise untreated cellulose papers.
• Wet-strengthened construction maintains paper integrity during prolonged vacuum and pressure filtration of aqueous samples.
• Nominal retention of 2.7um provides the particle size cutoff appropriate for the analytical or preparative separation method.

When your analytical procedure specifies a particular grade, the retention and purity characteristics documented above confirm method compliance. Meeting this challenge, consistent lot-to-lot ash values mean your validated gravimetric method stays valid without recalibrating blank corrections between purchases. Take control of your sample preparation variables and ensure that your data reflects the true nature of your work, rather than the quality of your consumables.

Diameter

63.5mm

Flow Speed

Slow

Folded/ Fluted/ Pleated

No

Grade

50

Hardened (Yes/ No)

Yes

Material

Cellulose Fiber

Nominal Ash Content (%)

<0.015%

Nominal Basis Weight (g/ m²)

115g/m²

Pack Count

100

Particle Retention

2.7um

Pore Size (µm)

2.7

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

Yes

Wettability

Hydrophilic

• Chloride Gravimetry - Retains silver chloride precipitate for mass-based chloride determination in water quality and process control.
• Silica Determination - Captures dehydrated silica for gravimetric analysis in cement, geological, and industrial raw material testing.
• Sulfate Gravimetry - Retains barium sulfate precipitate for ignition-based sulfate quantification in water and industrial samples.
• Total Ash Testing - Provides the ultra-low blank needed for accurate ash determination in food, pharmaceutical, and material samples.
• Gravimetric Determination - Collects and ignites precipitates for accurate mass measurement with negligible filter blank contribution.
• Zinc Analysis - Collects zinc ammonium phosphate precipitate for ignition-based quantification in metallurgical and water testing.