NEWSTAR Grade 44 Quantitative Filter Paper, Ashless
NEWSTAR Grade 44 is a thinner version of NEWTSAR Grade 42. This quantitative filter paper retains very fine particles but with lower ash weight per sample and almost twice the flow rate as Grade 42.
https://www.newstarsciences.com/chemical-analysis-filter-paper/quantitative-filter-paper-ashless-grade-44.html