Product Details
Qualitative cellulose filter papers perform separation by entrapping particulate within the random matrix of cellulose fibers inside the depth of the media, widely used in methods requiring determination and identification of particulate in liquids and gases. This natural fiber filter paper is commonly used to clarify liquid samples and is more convenient than flat filters when used in a filter funnel, with a sharply creased prefolded pattern that reduces preparation time. It is used for general laboratory separation, clarification applications, and soil analysis methods. Quantitative cellulose filter papers are primarily used in gravimetric analysis procedures and for sample preparation for further testing using various instrumentation. These high-quality filter papers are manufactured from refined pulp and alpha linters, acid washed, and have an extremely low ash content. Important terms include filter media, indicating serialized nomenclature without a grade or quality indication; furnish, referring to raw materials used in manufacture; ash content, determined by dry exposure at 900°C in a muffle furnace; retention, defined as nominal particulate retention at 98% efficiency in liquid; flow, indicating liquid flow rate speed relative to comparable products; basis weight, the nominal weight per meter² at 8% moisture measured in grams; thickness, measured under 4 psi using TAPPI method T411; and flat/fluted, describing flat stock supplied as sheets, rolls, or die cut parts, and fluted as 1/4 or 1/2 quadrant funnel folding.
