The growth in the market of propylene oxide (PO) and propylene glycol (PG), due to the price rise by Dow Chemical Company, is discussed. Dow expects PO demand to grow at 3 to 4 percent per year, while PG demand will grow 2 to 3 percent per year. The production of PG and PO is depended on natural gas and propylene. In addition to the energy and raw materials costs, overcapacity is also affecting the PO market. The range of end users products which has increased the demand of PG includes personal care, pharmaceuticals and unsaturated polyester resin applications.