The globalization and increased sophistication of the polymer industry has increased the number of requests for material identification. Requests for material identification can be broken into two major categories. The first category is identifying what polymer the resin or part is and if it is the correct material. The second category is whether the resin or part is contaminated. This presentation will identify and discuss a sequence of test procedures commonly used to identify a polymer, determine if the polymer is filled, identify the type and percent total filler, determine the glass transition temperature of an amorphous polymer, the melt temperature of a thermoplastic polymer, and identify techniques for determining whether a polymer is contaminated with another polymer, or a polymer has a surface chemical contamination.