{"product_id":"whatman-grade-44-quantitative-ashless-filter-paper-fine-precipitates-retained-15-cm","title":"Whatman Grade 44 Quantitative Ashless Filter Paper, Fine Precipitates Retained, 15 cm","description":"\u003cp\u003eCytiva Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs.\u003cbr\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAshless\u003c\/strong\u003e: 0.007% ash maximum for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades - very pure filters suitable for a wide range of critical analytical filtration procedures.\u003cbr\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHardened low ash\u003c\/strong\u003e: 0.015% ash maximum - treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These filters are particularly suitable for Büchner filtration where the tough smooth surface of the filter makes it easy to recover precipitates.\u003cbr\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHardened ashless:\u003c\/strong\u003e 0.006% ash maximum - acid hardened to give high wet strength and chemical resistance with extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.\u003cbr\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGrade 44: 3 μm (slow to medium filter paper)\u003c\/strong\u003e\u003cbr\u003eThin version of Grade 42 retaining very fine particles but with lower ash weight per sample and almost twice the flow rate of Grade 42.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable cellspacing=\"0\" cellpadding=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"lft\"\u003ematerial  \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003ecircles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"lft\"\u003e \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003ecotton filters (high-quality cotton linters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"lft\"\u003epackaging  \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003epack of 100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"lft\"\u003eparameter  \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003e0.29 psi wet burst\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"lft\"\u003e \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003e995 sec\/100 mL speed (Herzberg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"display: table-row;\"\u003e\n\u003ctd class=\"lft\"\u003ediam.  \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003e150 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"display: table-row;\"\u003e\n\u003ctd class=\"lft\"\u003ethickness  \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003e180 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"display: table-row;\"\u003e\n\u003ctd class=\"lft\"\u003eash  \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003e≤0.007%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"display: table-row;\"\u003e\n\u003ctd class=\"lft\"\u003epore size  \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003e3 μm (Particle retention)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"display: table-row;\"\u003e\n\u003ctd class=\"lft\"\u003ebasis weight  \u003c\/td\u003e\n\u003ctd class=\"rgt\"\u003e80 g\/m\u003csup\u003e2\u003c\/sup\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Cytiva","offers":[{"title":"PK (1)","offer_id":51110953943355,"sku":"90-7505-07-PK","price":130.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0921\/2041\/6571\/files\/90-7505-07.png?v=1784705392","url":"https:\/\/preiser.com\/products\/whatman-grade-44-quantitative-ashless-filter-paper-fine-precipitates-retained-15-cm","provider":"Preiser Scientific","version":"1.0","type":"link"}