- DURAFOAM is equal to RUBATEX and ENSOLITE . DURAFOAM will save you money! Get full details. Monmouth Rubber & Plastics is a privately owned company. We have been manufacturing Rubber & Plastic materials, (both solid & cellular) for over 35 years. Put our track record of quality, value and service to work for you. Exclusive Worldwide Manufacturers of . . . Closed Cell Sponge Rubber & Plastic ...rubberplastics.com