WHATMAN
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Filter paper grade4 กระดาษกรอง
- Whatman Grade 4 Qualitative Filter Papers (20-25 µm particle retention) are a standard grade, high flow rate filter paper. They are useful in qualitative analytical separations when fast flow is required and the collection of fine particles is not critical.
- These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).