FILTER PAPER, 'WHATMAN' NO.1 GRADE (0522) A good quality paper for general purpose use. Possesses medium retention and medium / fast flow rate. Suitable for qualitative work for filtering less fine precipitates and in quantitative work where ash weight and composition are not of significance. Supplied in pack of 100 circles. Sizes (diameter) available are 9cm, 11cm, 12.5cm, 15cm, 18.5cm, 21.5cm & 24cm. Qty :