Low density polyethylene (LDPE) resins from PROPLAST are thermoplastics made from the polymerization of ethylene in autoclave or tubular reactors at very high pressures. Unlike low-pressure polymerization technologies, high-pressure polymerization allows the co-polymerization of ethylene with polar comonomers, such as vinyl acetate or butyl acrylate.

The polymer is characterized by a highly-branched polymer structure.

Uniform branches with only a few short side chains with a density between 0.87 g/cm³ and 0.93 g/cm³ (“LLD” stands for “linear low density”)

It is a soft polyethylene that is produced under high pressure. It combines properties of LDPE and HDPE and is therefore an intermediate form of these two types of PE. It is mainly used for the production of stretch film. LLDPE very tough, dimensionally stable and has extreme puncture resistance. Other properties are very good weather and moisture resistance as well as extreme elasticity and tear resistance. The film is a little milkier than LDPE, for example. It can be processed into very thin foils and can be colored very easily.

LLDPE does not have its own recycling code and therefore no sign is printed on these films. In contrast to other PE films, LLDPE is very difficult to print on. We only process it as a mixed film in order to improve the film properties according to customer requirements.

LLDPE is resistant to water, diluted acids, alkalis, solutions of inorganic substances, solvents, alcohols, aliphatic hydrocarbons, petrol.

LDPE is not resistant to strong acids and oxidizing agents, oxidizing acids, esters, ketones and aromatic and chlorinated hydrocarbons.

LLDPE is a linear low-density polyethylene. It is a linear polymer with short-chain branching, and we produce it via copolymerization of ethylene with olefins having longer chains. We need to use low temperatures and pressures during this production. The final product of this process gives a narrow molecular weight distribution. Furthermore, the catalyst we use for this manufacturing process is Ziegler catalyst.

The polymerization can be done in either solution phase or gas phase. Moreover, when considering its properties, LLDPE has high tensile strength, high impact and puncture resistance when compared to LDPE. Moreover, this material is very flexible. It can elongate under stress.

What is Metallocene LLDPE

Metallocene LLDPE is the form of linear low-density polyethylene we produce using the metallocene catalyst. We denote it as mLLDPE. This material has excellent impact and puncture resistance.

Furthermore, it gives heat seal benefits. The important properties of metallocene LLDPE make it suitable in high-performance film applications in the food and medicinal fields.

LLDPE is linear low-density polyethylene while Metallocene LLDPE is the form of linear low-density polyethylene we produce using the metallocene catalyst. The key difference between LLDPE and metallocene LLDPE is that LLDPE has a low impact and puncture resistance compared to metallocene LLDPE.

Moreover, LLDPE is useful in the production of plastic bags, sheets, plastic wrap, pouches, toys, covers, etc. while Metallocene LLDPE is useful in high-performance film applications such as food and medical packaging, heavy-duty sacks, agriculture film and other non-packaging applications like insulation.

Below infographic provides more details on the difference between LLDPE and metallocene LLDPE.

LLDPE vs Metallocene LLDPE

LLDPE is a linear low-density polyethylene while metallocene LLDPE is the form of linear low-density polyethylene that produced using the metallocene catalyst. The key difference between LLDPE and metallocene LLDPE is that LLDPE has a low impact and puncture resistance compared to that of metallocene LLDPE.

High density polyethylene (HDPE) resins are thermoplastics made from the polymerization of ethylene in gas phase, slurry or solution reactors. Polymerization takes place under low-pressure conditions with the support of catalysts. HDPE is characterized by a linear polymer chain with few branches, and contains smaller amounts of comonomers such as butene, hexene or octene. HDPE grades are used in a variety of processing techniques such as extrusion, extrusion blow molding, injection and rotational molding.

HDPE forms the largest product family in polyethylene, and is used in numerous customer applications such as pipe, plastic fuel tanks, industrial packagings, bottles, healthcare articles, containers, toys, films, tapes and fibers.