Product Details
Qualitative cellulose filter papers perform separation by entrapping particulate within the random matrix of cellulose fibers throughout the depth of the media, and they are widely used in methods requiring determination and identification of particulate in both liquids and gases. This natural fiber filter paper is commonly used to clarify liquid samples, being easier and more convenient than flat filters when used in a filter funnel, with a sharply creased prefolded pattern that reduces preparation time. They are widely used for general laboratory separation, clarification applications, and soil analysis methods. Quantitative cellulose filter papers are primarily used in gravimetric analysis procedures and perform separations by entrapping particulate within the cellulose fiber matrix in the media depth. These high-quality filter papers are manufactured from refined pulp and alpha linters, acid washed, and possess an extremely low ash content. Ash content is measured by the dry method with exposure at 900°C in a muffle furnace. Retention is defined as the nominal retention of particulate at 98% efficiency in liquid, and flow rate is relative to comparable products listed in the product alignment. Basis weight represents the nominal weight of material per square meter at 8% moisture, measured in grams. Thickness is measured under 4 psi using TAPPI method T411. Flat stock is supplied as sheets, rolls, or die-cut parts, while fluted stock is folded in 1/4 or 1/2 quadrant funnel configurations. The filter media nomenclature is serialized without indicating grade or quality, and furnish refers to the raw materials used in manufacturing the wet-laid product.
