a method to reduce cross link vapors trapped in hollow cross link polyethylene products produced by rotomolding is disclosed . ozone is introduced into the hollow product after the polymer has cross linked . compressed air is delivered with the ozone to circulate the ozone effectively . use of the ozone oxidizes the cross link vapors and permits reduction in stored inventory of units awaiting dissipation of the cross link polyethylene vapors . a system for batch treatment of the products is also disclosed .