Also known as Polytetrahydrofuran, this linear chain polymer presents as a white waxy solid that melts between 20 and 30 °C. Partially soluble in hot water and very slightly soluble in cold water, this substance is an irritant of the eyes and lungs and a slight irritant of the skin. It can be stored at room temperature in a dry and well-ventilated area. Store away from extreme heat and strong oxidizing agents.