 Multilayer packaging or composite materials are widely used in food storage, distribution and consumption. However, their use has raised environmental concerns due to the potential for plastic waste to cause harm to the environment. One method of dealing with this issue is through the recycling of multilayer plastic waste, MLPW. This study examined the effectiveness of ultrasonication in separating layers from MLPW. It was found that ultrasonication is the most important factor in layer separation, followed by nitric acid concentration. Temperature and width were also found to be important factors, but not as much as the other two. These findings provide insight into how to best separate layers from MLPW and could lead to improved methods of recycling. This article was authored by Ayni Sainiut, Jintara's Dinafos and Tamari Mumlats.