Preparation and evaluation of some investigated natural and acrylonitrile rubber vulcanizates for physiotherapeutic purposes

A trial was made to design and prepare rubber article that can be used to reactivate, strengthen, and reinforce the hand muscles and fingers which had suffered from trouble movement. The investigated rubber article was prepared from natural and acrylonitrile rubber formulations. These formulations were processed in the form of compounds which contain significant quantities of fillers such as Hisil, CaCO3, and TiO2. The rheological characteristics and physicochemical properties of the vulcanizates were determined according to standard tests. It was found that it is possible to prepare the designated rubber article for the desired purpose. The test results showed that the prepared rubber article had good chemical resistance against acid, alkali, and salt. This rubber also possessed high resistance to deterioration and deformation. The prepared article had an ability to retain its elastic property after the action of compressive forces at 70 degrees C for 24 h. This property was confirmed by its application in commercial therapeutic hand-exercise article.