Polyethylene (ldpe) - Import export

Polyethylene LDPE has a high degree of short and long chain branching. It is one of the most simplest and common polymer. It has, therefore, less trong intermolecular forces as the instantaneous-dipole inducted-dipole attraction is less. This results in a lower tensile strength and increased ductility. LDPE is created by free radical polymerization. The high degree of branching with long chains gives molten LDPE unique and desirable flow properties. LDPE is used for both rigid containers and plastic film applications such as plastic bags and film wrap. LDPE Polyethylene are the most commonly industrially produced plastics. The various types of polyethylene are labelled according to their density. Low-density polyethylene, i.e. polyethylene with a density of between 0.91 to 0.94 g/cm³, usually referred to as LDPE. LDPE is mainly used for packaging products.

Polypropylene ( PP ) is thermoplastis copolymer used in a wide variety of different applications including packaging, textiles, plastic parts and reusable containers. It is defined by a density range of 0.946 g/cm3 for crystalline. PP is resistant to many chemical solvents, bases and acids. Polypropylene is most commercial isotactic and has an intermediate level of crystallinity between that of low-density polyethylene (LDPE) and high-density polyethylene (HDPE). Polypropylene is normally tough and flexible, especially when copolymerized with ethylene. This allows polypropylene to be used as an engineering plastic, competing with materials such as ABS. Polypropylene is reasonably economical, and can be made transucent when uncolored but is not as readily made transparent as polystyrene, acrylic, or certain other plastics.