SEARCH Articles Figures Tables Tables 5.4 and 5.5 predict that unvulcanised natural rubber , all values being in units ofMPa. This is found to be true. Similarly it is found that there is a wide range of solvents for polystyrene in the solubility parameter range 17.2-19.7 MPa. [Publishers Imprint] [Publishers Imprint] See Also: Tables 5.4 and 5.5 predict that unvulcanised natural rubber , all values being in units ofMPa. This is found to be true. Similarly it is found that there is a wide range of solvents for polystyrene in the solubility parameter range 17.2-19.7 MPa. Tables 5.4 and 5.5 predict that unvulcanised natural rubber , all values being in units ofMPa. This is found to be true. Similarly it is found that there is a wide range of solvents for polystyrene in the solubility parameter range 17.2-19.7 MPa.