{"product_id":"whatman-grade-540-quantitative-ashless-filter-paper-medium-precipitates-retained-4-25-cm","title":"Whatman Grade 540 Quantitative Ashless Filter Paper, Medium Precipitates Retained, 4.25 cm","description":"\u003cp id=\"overview\" class=\"lead-paragraph\"\u003eCytiva's Whatman Grade 540 is a high-purity, acid-treated cellulose lab filter paper. Mechanically strong Grade 540 is well suited for quantitative or gravimetric analysis of strongly acidic or alkaline samples.\u003c\/p\u003e\n\u003cp class=\"lead-paragraph\"\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAcid-treated for high wet-strength\u003c\/li\u003e\n\u003cli\u003eExtremely low ash content (0.006% ash maximum)\u003c\/li\u003e\n\u003cli\u003eNominal particle retention of 8 µm\u003c\/li\u003e\n\u003cli\u003eMedium flow rate (Herzberg filtration speed 200 s)\u003c\/li\u003e\n\u003cli\u003eHigh chemical resistance to strong acid and alkali suspensions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"rte-wrapper\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eCytiva's business offers hardened ashless filter paper for a variety of precipitate sizes. Along with general filtration Grade 540, the range includes \u003cspan\u003eGrade 542\u003c\/span\u003e for retention of fine precipitates and \u003cspan\u003eGrade 541\u003c\/span\u003e for fast filtration. All three grades are designed for use in gravimetric analysis.\u003c\/p\u003e\n\u003cdiv class=\"read-more-expandable\"\u003e\n\u003ch2\u003eGravimetric analysis of acid and alkali suspensions\u003c\/h2\u003e\n\u003cp\u003eCytiva's hardened, ashless Grade 540 lab filter paper is frequently used as a gravimetric filter during analysis of metals in acidic or alkaline solutions and in the collection of hydroxides. The acid-treated surface prevents tearing during filtration and allows the user to scrape precipitates from the paper.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Cytiva","offers":[{"title":"PK (1)","offer_id":51110954041659,"sku":"90-7506-01-PK","price":41.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0921\/2041\/6571\/files\/90-7506-01.png?v=1784705395","url":"https:\/\/preiser.com\/products\/whatman-grade-540-quantitative-ashless-filter-paper-medium-precipitates-retained-4-25-cm","provider":"Preiser Scientific","version":"1.0","type":"link"}