ARDL offers Free Sulfur Content testing to qualify and quantify the amount of free sulfur present in a polymer compound. We utilize ASTM test methods and a Leco Determinator to perform analysis to measure the free sulfur extract values (total sulfur). 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 determine 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 to provide some insight in 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).
ASTM D 297
