High-Density Polyethylene, or HDPE, is a linear polymer made from ethylene through a catalytic reaction. HDPE is more tightly packed than LDPE and has a lower chemical resistance. HDPE can also withstand higher temperatures, being more opaque and complex than LDPE. It can withstand 120deg Celsius for short periods and 110deg Celsius continuously. High-density polyethylene is a great material for blow molding, such as bottles, cutting boards and trays.