Grade 540 Ashless General Lab Filter Paper, 21mm Circles (100 pcs) SKU: 1540-321

Quantitative Ashless Filter Paper - 1540-321

Quantitative methods where the filter is ashed alongside the sample require documented, ultra-low residue to protect analytical accuracy. Certificate of analysis provides lot-specific ash content values for incorporation into method blank calculations and quality records. Controlled manufacturing delivers the documented retention, flow rate, and physical consistency that analytical and preparative filtration methods require.

Key Filter Paper Characteristics

• Manufactured under controlled acid washing conditions, each sheet delivers consistent ash levels across production lots for method reproducibility.
• Ashless filter paper provides the documented low residue needed for ignition-based analytical procedures where filter mass affects results.
• Acid washing process removes metallic contaminants that could interfere with trace element determinations after ignition.
• Hardened filter paper resists tearing when wet, simplifying the transfer of collected precipitates from funnel to crucible.
• Tightly controlled manufacturing produces documented ash content that remains consistent across production lots for method reproducibility.

When your quality system requires documented specifications for every consumable, the grade data above provides the traceability your auditors expect. With this in mind, certificate-backed ash specifications provide the documented evidence your quality auditors require for gravimetric method validation. 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

21mm

Flow Speed

Medium

Folded/ Fluted/ Pleated

No

Grade

540

Hardened (Yes/ No)

Yes

Material

Cellulose Fiber

Nominal Ash Content (%)

<0.006%

Nominal Basis Weight (g/ m²)

88g/m²

Particle Retention

8um

Pore Size (µm)

8

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

Yes

Wettability

Hydrophilic

• Aluminum Analysis - Collects aluminum hydroxide precipitate for ignition and weighing in metallurgical and environmental methods.
• Gravimetric Determination - Collects and ignites precipitates for accurate mass measurement with negligible filter blank contribution.
• Total Ash Testing - Provides the ultra-low blank needed for accurate ash determination in food, pharmaceutical, and material samples.
• Nickel Determination - Retains nickel dimethylglyoxime precipitate for ignition-based quantification in alloy and plating bath testing.
• Phosphate Gravimetry - Collects magnesium ammonium phosphate precipitate for ignition to pyrophosphate in soil and fertilizer analysis.
• Lead Quantification - Captures lead sulfate precipitate for gravimetric determination in environmental and industrial samples.