This presentation deals with the basic identification of plastics by the use of FTIR analysis, DSC, TGA, and muffle furnace ash. The operation of each instrument is explained, as are the results that can be obtained and the conclusions that can be drawn from each of the tests. Spectra are displayed showing similarities and differences between polymers. Thermograms showing melting points, crystallinity points, and glass transition temperatures are also shown. Advantages and limitations of each instrument will also be discussed.