The melting temperature of HDPE is about 130ºC and it can be used ntinuously between -100ºC and +110ºC depending on the mechanical stress level. The density of HDPE is 0.95 to 0.96 gra per cm 3. Chemical resistance of HDPE is follows: Excellent resistance (no attack) to dilute and ncentrated Acids, Alcohols and Bases.