Whatman
Grade 542 Ashless Fine Precipitate Filter, 70mm Circles (100 pcs) SKU: 1542-070

Quantitative Ashless Filter Paper - 1542-070

Gravimetric procedures in regulated laboratories require documented ash content that can be reported alongside analytical results for compliance verification. Certificate of analysis provides lot-specific ash content values for incorporation into method blank calculations and quality records. Consistent physical properties across the full sheet area support uniform filtration results in both gravity and vacuum applications.

Key Filter Paper Characteristics

• Hardened surface treatment increases wet strength and chemical resistance for demanding analytical procedures.
• At 2.7um rated retention, the fiber matrix captures particles above the threshold while allowing smaller materials to pass through.
• Pure cellulose fiber matrix combines low inorganic residue with the mechanical integrity needed for careful precipitate transfer.
• Acid washing process removes metallic contaminants that could interfere with trace element determinations after ignition.
• Resin treatment provides the tensile strength to resist tearing under vacuum, even when processing large sample volumes.

If your laboratory supports multiple research groups with varying filtration needs, this paper's broad applicability simplifies your procurement process. Ultra-low ash content ensures your gravimetric results reflect captured material, not residue from the filter paper itself. 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

70mm

Flow Speed

Slow

Folded/ Fluted/ Pleated

No

Grade

542

Hardened (Yes/ No)

Yes

Material

Cellulose Fiber

Nominal Ash Content (%)

<0.006%

Nominal Basis Weight (g/ m²)

93g/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

• Phosphate Gravimetry - Collects magnesium ammonium phosphate precipitate for ignition to pyrophosphate in soil and fertilizer analysis.
• Calcium Oxalate Analysis - Captures calcium precipitate for ignition to calcium oxide, supporting clinical and water hardness testing.
• Iron Determination - Collects iron hydroxide precipitate for gravimetric determination in ore assay and environmental analysis.
• Nickel Determination - Retains nickel dimethylglyoxime precipitate for ignition-based quantification in alloy and plating bath testing.
• Zinc Analysis - Collects zinc ammonium phosphate precipitate for ignition-based quantification in metallurgical and water testing.
• Total Ash Testing - Provides the ultra-low blank needed for accurate ash determination in food, pharmaceutical, and material samples.