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Material: composed of high-quality coarse cellulose, excellent workmanship, bleaching, non toxic, non heating, heat resistance smooth surface, uniform texture, high mechanical strength, strong adsorption capacity, good diffusion effect. Ash content: equal or less than 0.01%. Air filtration: Collect medium particles for pollution monitoring ,retains medium crystalline particles (10~15 micron). Chemistry class: Filter paper can teach basic qualitative separations and paper chromatography. Uses: In agriculture, for soil analysis and seed testing. In the food industry, primary filter paper is often used to separate solid food from related liquids or extract liquids, and is also widely used in teaching for simple qualitative analysis and separation."