High-density polyethylene (HDPE) is known for its large strength-to-density ratio. The density of HDPE can range from 0.93 to 0.97 g/cm3 or 970 kg/m3. HDPE has little branching, giving it stronger intermolecular forces and tensile strength than LDPE. It is also harder and more opaque and can withstand somewhat higher temperatures (120 °C/ 248 °F for short periods). HDPE has a high chemical resistance making it a suitable material for containing chemicals, fuels, detergents and solvents. HDPE compounds offer various different characteristics adding i.a. flame retardant, UV stabilizer or electric conductivity.
Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene. LDPE is defined by a density range of 0.910–0.940 g/cm3. It has a wide range of applications, especially in soft packaging and films. LDPE can be enhanced and processed in various ways to suit specific purposes such as; longer conservation of perishables, anti-static for electronics packaging, anti-slip to accelerate machineprocessing or matters such as impact resistance and elasticity.
Linear low-density polyethylene (LLDPE) differs structurally from conventional low-density polyethylene (LDPE) because of the absence of long chain branching. LLDPE has higher tensile strength and higher impact and puncture resistance than LDPE. It is very flexible and elongates under stress. It can be used to make thin films, with better environmental stress cracking resistance. LLDPE has a high resistance to chemicals and good electrical properties. It is, however, more difficult to process than LDPE. In compound form, we offer LLDPE with various different characteristics like flame retardant, anti-static or both.
Polypropylene (PP) has a density between 0.895 and 0.92 g/cm³. PP is normally tough and flexible, especially when copolymerized with ethylene, allowing PP to be used as an engineering plastic. Furthermore, PP is known to have good fatigue resistance. The melting point occurs at a range from 130 to 171 °C. PP can be used for a wide variety of applications such as packaging and labeling, textiles, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers and automotive components. PP compounds offer various different characteristics adding i.a. CaCO3, EPDM or Talc.