Hoseo University 1 article published in JoVE Engineering Testing of Nanoparticle Release from a Composite Containing Nanomaterial Using a Chamber System Gun Ho Lee1, Kang-Ho Ahn1, Il Je Yu2 1Department of Mechanical Engineering, Hanyang University, 2Institute of Nanoproduct Safety Research, Hoseo University Nanoparticle release is tested using a chamber system that includes a condensation particle counter, an optical particle counter and sampling ports to collect filter samples for microscopy analysis. The proposed chamber system can be effectively used for nanomaterial release testing with a repeatable and consistent data range.