rotational molding projects have the following advantages:little investment in equipments and molds, about 40% of energy saved, products' high strength and corrosion-resistant property, being environment-friendly, and being economical and practical. The equipment's property of being highly universal can ensure that integral molding of various extra-large MPE products only necessitates mold replacement. Such products include environment-friendly water tank, large-diameter water pipe of Φ3000, electrolytic bath for chemical industry, pickling bath, steel-plastic-compounded corrosion-resistant tanks and various  pipelines, cases of containers for preservation of vegetables and fruits, electric safety hopper that can endure 50,000 volts, aquatic yacht, life boat,beacon light,floating bucket,etc.