●Filter paper diameter: 94 mm ●Coarse cellulose filter papers remove particles > 20 µm ●Filtration Speed: 35 - 70 sec; Ash content: ≤0.15% ●Suitable for FunChem Porcelain Buchner Funnel 100 mm ●Guaranteed after-sales service: if received defective or damaged item, please contact us. We will definitely help you solve the problem until you are satisfied