1-Methyl 2-Pyrrolidinone (CAS Registry Number: 872-50-4) Test
The 1-Methyl 2-Pyrrolidinone test acetone is also one of the solvent tests for resurfacing. If the part passes the Acetone test, move on to the 1-Methyl 2-Pyrrolidinone test. When using 1-Methyl 2-Pyrrolidinone, completely immerse the part in the solution and heat it to 115 to 120 °C for 2 to 5 min (the time and temperature may be adjusted to compensate for the sample). Once the part is removed from the solution, use a cotton swab to wipe the coating off (avoid markings if possible). The removed coating will show on the cotton swab as black in color, and indicative of a suspect counterfeit part.