Whatman QM-H from Cytiva is a pure quartz fiber filter for use in testing acidic gases, stacks, flues, and aerosols. Whatman QM-H has low heavy metal content so is well-suited for heavy metals analysis. High stability up to 900°C High filtration efficiency Binder-free Minimal reactivity with biological or chemical components The Whatman range of quartz fiber filters from Cytiva's business also includes Grades QM-A and QM-B for air monitoring applications. Whatman QM-H sizes Cytiva's pure quartz fiber filters come in 50-piece packs with four diameters: 37 mm 47 mm 90 mm 150 mm