UN Rated 55 Gallon Plastic Open Head Drums can handle a wide range of hard-to-hold materials and is a good choice for indoor or outdoor environments. 55 Gallon Drums. 30 Gallon Drums and 15 Gallon Drums are Lightweight high-density polyethylene resists corrosion for use in harsh environments. These drums are blow molded for increased chemical resistance and improved strength. Drums meet UN requirements and can be used in a variety of industrial and commercial applications.