Whatman
Grade 43 Ashless Filter Paper for Inorganic Analysis, 185mm Circle, 100/Pk SKU: 1443-185

Quantitative Ashless Filter Paper - 1443-185

Classical analytical methods requiring filter ignition with collected precipitate demand documented ash values verifiable through every production lot. Cellulose purity and documented ash specifications position ashless paper as the standard medium for ignition-based quantitative determinations. In turn, certificate of conformance documentation accompanies each lot, providing traceability for quality systems and regulatory audit requirements.

Key Filter Paper Characteristics

• Rated at 16um particle retention, the fiber matrix provides a defined cutoff for consistent separation across analytical batches.
• Acid-washed cellulose construction produces ash content below 0.01%, meeting the blank value requirements of quantitative gravimetric methods.
• Ashless filter paper provides the documented low residue needed for ignition-based analytical procedures where filter mass affects results.
• Nominal basis weight of 95g/m² reflects the fiber density that determines flow rate, retention, and mechanical handling characteristics.
• Controlled fiber density balances rapid filtration with complete precipitate capture for efficient quantitative determinations.

Scaling your method from development to routine production requires paper consistency at every lot, and the specifications above provide that assurance. To meet this need, ashless certification supports the regulatory compliance documentation your environmental and pharmaceutical methods demand. Elevate the quality of your analytical data today by standardizing on a filtration product built to meet the exact specifications of your applications.

Diameter

185mm

Flow Speed

Medium Fast

Folded/ Fluted/ Pleated

No

Grade

43

Hardened (Yes/ No)

No

Material

Cellulose Fiber

Nominal Ash Content (%)

<0.007%

Nominal Basis Weight (g/ m²)

95g/m²

Pack Count

100

Particle Retention

16um

Pore Size (µm)

1.5

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

• Iron Determination - Collects iron hydroxide precipitate for gravimetric determination in ore assay and environmental analysis.
• Gravimetric Determination - Collects and ignites precipitates for accurate mass measurement with negligible filter blank contribution.
• Sulfate Gravimetry - Retains barium sulfate precipitate for ignition-based sulfate quantification in water and industrial samples.
• Silica Determination - Captures dehydrated silica for gravimetric analysis in cement, geological, and industrial raw material testing.
• Aluminum Analysis - Collects aluminum hydroxide precipitate for ignition and weighing in metallurgical and environmental methods.
• Phosphate Gravimetry - Collects magnesium ammonium phosphate precipitate for ignition to pyrophosphate in soil and fertilizer analysis.