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Supertek Filter Paper Grade 1, 90 mm Qualitative Pack of 100 sheets. Qualitative filter papers are made from virgin cellulose fiber. Grade 1 filter papers are the most widely used in general laboratory use. They are frequently used to purify or clarify liquids. They are frequently used to separate precipitates or sediment from liquid for further analysis. Very useful in soil analysis or seed testing, education and in the commercial food industry. Covers a wide range of laboratory applications, frequently used for clarifying liquid Areas of use include the food industry & agriculture. Widely used in education for teaching simple qualitative analytical separations.