Hardened quantitative filter paper medium speed max ash 0.02%

Hardened quantitative filter paper with max ash 0.02%. An intermediate option between ash-free quantitative paper (max 0.002%) and low-ash qualitative paper (max 0.06%). Equivalent to Whatman 52.

Technical specifications

• Ash content:Max 0.02%
• Pore size:8-12 μm
• Basis weight:80 g/m²
• Thickness:270 μm
• Filtration speed:Medium
• Wet strength:High — hardened grade
• Equivalent to:Whatman 52

When to use

General-purpose filtration in laboratories where quantitative accuracy matters but is not critical. Medium speed balances retention against flow rate. Hardening improves handling when wet — useful when transferring the paper to a crucible without tearing.

Suitable for quality control, water analysis, routine gravimetry and undergraduate analytical chemistry teaching.

Packaging and format

• Circles:Packs of 100, shrink-wrapped in plastic
• Folded:In box

Where this fits in the range

For maximum purity in critical gravimetric work, use ash-free paper (max 0.002%). For qualitative applications, low-ash paper (max 0.06%) is sufficient and lower cost. This grade sits in between — solid quantitative performance without the price point of the purest grades.