How is LDPE Made?

If you are seeking low density polyethylene (LDPE) for your business, you may ask, “How is LDPE made?” Perhaps you would like to know more about its manufacturing process. Polyethylene is one of the most extensively used thermoplastics worldwide. LDPE is a clear or translucent plastic which is durable, chemically resistant, and displays waterproofing capabilities. LDPE is used to manufacture a wide variety of products, such as plastic bags and stretch wrap.

LDPE is made through a process known as polymerization, where the polyethylene monomer is derived. Polymerization is defined as the linking of monomers into polymer chains. Polyethylene monomers are compressed in an autoclave or tubular reactor to enable polymerization. Small molecules known as fractions are removed and certain fractions transform into the desired thermoplastic result. Under high temperatures and high pressure, the LDPE plastic is then extracted from the ethylene gas along with catalyst oxide initiators. The LDPE manufacturing process forms a polymer structure with both longer and shorter branches of LDPE.

How is LDPE Made and What are its Characteristics?

While it is important to ask how is LDPE made, it is equally important to be familiar with its characteristics. LDPE shares many similarities with high density polyethylene (HDPE). Their internal compositions, however, result in many distinct differences. The polymer chains in both materials are branched in LDPE whereas with HDPE, polymers have a crystalline structure. These differences in the way polymers are organized result in distinguishing characteristics in both LDPE and HDPE materials.

LDPE and HDPE share differences in their physical composition and recyclability. LDPE material feels softer and more flexible than HDPE material. The melting point of LDPE is much lower. This results in LDPE material being more transparent than HDPE material. HDPE is more of a rigid material that offers more chemical resistance. Because it is melted at higher temperatures, it can withstand greater temperatures. LDPE and HDPE are both recyclable materials but must be recycled separately as each material is classified at different recycling levels.

LDPE has a large range of properties. Though LDPE and HDPE have distinctive differences, they share many similar applications. LDPE displays optimal resistance to acids and alcohols, as well as excellent electrical insulation characteristics. LDPE has a high impact strength at low temperatures and can effectively withstand the elements. Being less expensive to produce than HDPE, LDPE is a preferred material for manufacturing plastic bags and stretch wrap.

At Danshar Polybag and Resin, we answer all your questions, such as how is LDPE made. Our many years of experience in the plastics industry speak for themselves. Our manufacturers use high quality resins to produce the finest LDPE materials. Whether you are seeking plastic bags or stretch wrap, you and your customers are certain to be satisfied. Contact us today for a custom quote.

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2899 Steeles Ave. W.,
Units 9 & 10,
North York, Ontario
M3J 3A1


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