Ideal agent silica gel should show the performance of the following: (1) silica gel coating and improve its flow characteristics; (2) ensure a more smooth coating; (3) improve the gloss coating the finished product; (4) to improve as Paper printability; (5) to reduce coated paper sheets with cracks and peeling; (6) in the super calendar to reduce or eliminate the powder out phenomenon; in the case does not require additional process, by mechanical pressure of a light These grades of paper for finishing finishing.