reported in the following table the data of absorption under a load of 0 14 psi of 0 3 g of dry product for 30 minutes in saline solution are reported in the following table this example highlights the dependence of hydrogel features on 1 concentration of boric acid employed and 2 crosslinking times in particular it may be inferred that there are different responses based on the test employed and in particular as to retention after centrifugation the best results are observed for hydrogels having low concentrations of crosslinking agent 4 as expected since it is known that by decreasing the degree of crosslinking an increase of crc is observed as to absorption and retention under load the results obtained would lead to favor boric acid concentrations of u2267 4 probably because gels more crosslinked i e with a thicker packing of the polymer chains are able to more readily endure the load to which they are subjected expelling less liquid in particular the material obtained by employing an initial baric acid concentration of 8 does not release liquid at all during the test of saline solution retention under load as to absorption under load a greater crosslinking did not lead to improvements an increase of crosslinking agent concentration to gt 4 values does not foster the formation of a stiffer gel able under load to swell by taking on liquid anyway it may be inferred from what reported in the foregoing that.