1-乙烯基-2-吡咯烷酮，1-Vinyl-2-pyrrolidinone；≥98%, (stabilized with N,N′-di-sec-butyl-1,4-phenylenediamine) for synthesis

Assay (GC, area%): ≥ 98.0 % (a/a)
Density (d 20 °C/ 4 °C): 1.043 - 1.044
Identity (IR): passes test
Due to its specific melting range the product may be solid, liquid, a solidified melt or a supercooled melt.
The material is stabilised N,N´di-sec-butyl-p-phenylendiamine. At time of analytical testing a content of >10 ppm stabiliser was determined.