As we know, SAP (super absorbent polymer) as "engine" of diapers , largely determines the merits of diaper performance. There are several indicators to measure SAP performance: retention ratio of water absorption,rate of absorption, absorption amount of pressure, liquid permeability, particle size.

We chose the Japanese Merries, Moony, American Pampers, Germany Eress. These four brands passed the standard test method, the performance is better by Merries, Eress, Pampers, Moony. We use the professional technology to separate the absorbent polymers from the diapers, then tested the saturation absorption and water retention rate under 0.9% physiological saline, the test results are as follows:

Many people considered as the SAP's water absorption rate is more higher more better, but they don’t know that it’s a  complicated relationship among these indexes of the SAP, it’s appears like complementary and interacting relationship. Such as the water retention and absorption rate with the liquid permeability. Generally speaking, if the water retention and absorption rate of SAP is high , the liquid permeability will be either normal or sometimes even worse; On the contrary, if the liquid permeability is better, the water retention and absorption rate will not be too high.

Therefore, a large number of experimental data show that the superior performance of diapers is not only determined by the high absorbency SAP, but keeping about 30 water retention capacity, in the meanwhile increase the liquid permeability and SAP pressure absorption. In order to ensure that urine  conduct quickly in SAP and lock the moisture in the urine.