High-quality, 90mm diameter ashless filter papers with a blue ribbon. Slow filtration speed, ideal for fine precipitates and heavy metal sulfate retention (lead, barium). 100 count pack. Perfect for quantitative filter paper needs in laboratory settings, including heavy metal analysis and environmental testing. These analytical filter papers are suitable for water analysis and various other applications.
<img src="/images/90mm-ashless-filter-papers-blue-ribbon.jpg" alt="90mm Ashless Filter Papers (Blue Ribbon), 100 Pack">
US: temporary delays — postal services aligning new import rules, 
EU: 1–2 weeks, 🌍 Worldwide: 1–4 weeks ✈️