this invention is directed to improved parts for a container filling machine , and in particular , to a tube filling machine . it has been found that moving parts of such machines that come into contact with the products being packaged shall be constructed of plastics that have a durometer hardness of more than about 65d and preferably more than about 70d . in particular , the plastic should be a polyurethane . such a plastic has a low wear rate in the presence of products which contain abrasives , such as toothpastes .