Polyethylene or polythene is the most common plastic in use today, polyethylene is a combination of similar polymers of ethylene with different values of n. it is primarily used for packaging. pe has distinct properties i.e. light weight, flexibl, long lasting, sun resistant.
High-Density Polyethylene (HDPE) has a low degree of branching. it is the sturdiest and most inflexible type. it has high tensile strength and is used to produce milk jugs, detergent bottles, butter tubs, garbage containers and water pipes.
Low-Density Polyethylene (LDPE) has a high degree of short- and long-chain branching, which give it a lower tensile strength and increased ductility. this gives molten LDPE unique and desirable flow properties. it is used for both rigid containers and plastic film applications, such as plastic bags and film wrap.
Linear Low-Density Polyethylene (LLDPE) has a substantially linear polymer with significant numbers of short branches. it has higher tensile strength than LLDPE, and it exhibits higher impact and puncture resistance than LLDPE. LLDPE is extremely tough and inflexible. these features are suitable for larger items, such as covers, storage bins and some types of containers.
Medium-Density Polyethylene (MDPE) is a type of polyethylene having a density in the range of 0.926 – 0.940 g/cm3. like LLDPE.MDPE is produced on a much smaller scale than HDPE and is mainly used for garbage bags and for flexible consumer packaging where both stiffness and flexibility is required.
Polyethylene Terephthalate (PET OR PETE) is a general-purpose thermoplastic polymer which belongs to the polyester family of polymers. polyester resins are known for their excellent combination of properties such as mechanical, thermal, chemical resistance as well as dimensional stability.