Whatman No. GF/B is three times thicker than GF/A with higher wet strength and significantly increased loading capacity. Combines fine particle retention (1.0 ¬µm) with good flow rate. Particularly useful where liquid clarification or solids quantification is required for heavily loaded fine particulate suspensions. Can be used as a finely retentive membrane prefilter. Used in LSC techniques where high loading capacity is required.