Ahlstrom’s micro-quartz filters are useful for testing hot “stack” gases as the quartz fibers can withstand temperatures up to 900°C. In addition micro-quartz is used when the highest purity media is required. With excellent filtration properties and minimal traces of metals and minerals quartz fibers are dimensionally stable and can be used in the analysis of acidic gases (with the exception of HF). Other sizes available for special order. T293 also available for special order. Ahlstrom Laboratory Filter Catalog About Ahlstrom Filter Grades (pdf)

select DISTINCTROW top 10 p.CatalogId,p.ccode from products p, prodcategories cc, categories c where cc.intCatalogId=p.CatalogId and cc.intcategoryid=c.categoryid and cc.intcategoryid = 1210 and p.hide = 0 and (p.customermatch is null or p.customermatch = '') and (p.loggedin = false or p.loggedin is null) and (c.customermatch is null or c.customermatch = '') and (c.loggedin = false or c.loggedin is null) AND (higherCatalogId is null) order by p.ccode