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No.42 Quantitative Filter Paper # 42 Whatman 03034297 - Specification: JIS standard: 5 types C, domestic filter paper equivalent: No. 5C, particle retention (μm): 2.5, thickness (μm): 0.20, ash (%): 0.007, weight (
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Whatman 1442-185 Ashless Quantitative Filter Paper, 18.5cm Diameter, 2.5 Micron, Grade 42 (Pack of 100): Science Lab Quantitative Filter Paper: Amazon.com: Industrial & Scientific
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