Although there are several types of additives called vulcanizers used to produce a cross-linked elastomer or thermoset, sulfur is still the most widely used to create cross-links between polymer chains forming a continuous three dimensional network. The amount of sulfur present and the type of cross-links that are formed determines the physical properties of the matrix such as Young's modulus, strain, resistance to swelling, tear strength, etc. Therefore, it is appropriate to determine the percentage of sulfur present in the vulcanized elastomer or thermoset not only to determine the amount of sulfur, but also provide some insight to the type of cure system that was used, a conventional sulfur system, a semi-ev system, or a peroxide cure (lack of sufficient sulfur to properly vulcanize the elastomer).