ε-caprolactam, a residual monomer in nylon 6, was analyzed using Asahipak ODP-50 4D, a reversed-phase chromatography column. Analysis of ε-caprolactam can be performed without an influence from extract contaminants.

Sample pretreatment

• Add 10 mL of pure water to 0.5 g of nylon 6 pellets. Seal and heat at 100 ℃ for 2 hours.
• Once the mixture is cooled to room temperature, filter through a 0.5μm filter. Use the filtrate as a test sample.

Sample: 10 μL

1. 1.ε-Caprolactam