we have many plastic art works belongs to many artistic persons so we want active way to take represintative sample to choose to analysis from many variable plsstic art works
The best way for sampling cannot be explained as the number of art work and size and the materials used are unclear.
However, the fastest way to know the plastic used will be FTIR. If you can take small (as small as 3- 5mm) sample and run FTIR. Then you can find the base polymer. If it looks complicated in FTIR, then DSC can be performed for selected sample to categorize the sample based on the base polymer.