What is HDPE

HDPE stands for High-Density Polyethylene, a versatile thermoplastic produced by polymerizing ethylene. It is characterized by a high strength-to-density ratio, making it tougher and more rigid than Low-Density Polyethylene (LDPE and LLDPE). With a typical density ranging from 0.93 to 0.97 g/cm³, HDPE offers excellent impact resistance, chemical resistance, and moisture barrier properties, along with higher tensile strength, making it suitable for heavy-duty applications.

You will find HDPE in everyday items such as milk jugs, detergent bottles, and plastic bags, but it also excels in industrial sectors—including water and gas pipes, plastic lumber, and even geomembranes. Its molecular structure, with minimal branching, provides a crystalline advantage, allowing it to withstand temperatures up to approximately 120°C (248°F) °C for short periods, though at around 130°C (266°F).

It may soften at times. For example, SABIC produces HDPE grades such as SABIC® HDPE B5429, specifically designed for blow molding, with a density of 954 kg/m³ and excellent stress crack resistance. Different grades adjust properties such as melt flow or UV stability to meet specific requirements for pipes, films, or containers.

Interested in detailed information on a specific HDPE application or grade? Please feel free to inquire!

We are committed to meeting all your HDPE polymer needs

What are the key physical and mechanical properties of HDPE?

Performance indicators	Typical range
Density	0.941 – 0.965 g/cm³
Melting Point	125 – 135°C
Tensile Strength	20 – 37 MPa
Flexural Modulus	~1000 – 1500 MPa
Elongation at Break	100 – 1000% (grade-dependent)
Hardness (Shore D)	~60 – 70

Data may vary depending on supplier and formulation.

What are the common applications of HDPE?

HDPE is widely used across various industrial and consumer products, including:

Pipes and fittings (e.g., for gas, water supply, and sewage systems)

Blow-molded bottles and containers

Plastic pallets and crates

Geomembranes for landfill liners

Household items (e.g., cutting boards, storage bins)

Is HDPE suitable for outdoor environments?

Standard HDPE Limited UV resistanceHowever, UV-stabilized grades can meet long-term outdoor application requirements, particularly suited for scenarios such as agricultural films, geomembranes, or outdoor pipes.

Does HDPE meet food contact safety standards?

Yes, numerous HDPE grades comply with FDA, EUfood contact regulations in the EU or other regions, and are commonly used for milk bottles, food containersas well as cutting boards..

What are the typical processing methods for HDPE?

HDPE offers versatility and can be processed via:

• injection molding

• blow molding

• film extrusion

• pipe extrusion

The processing temperature range is typically 180°C to 260°C, depending on the processing method and grade.

Is HDPE recyclable?

Yes. HDPE is recyclable and is typically identified by Resin Code #2.Recycled HDPE is used in non-critical applications, such as:

• Plastic lumber
• Drainage pipes
• Recycling bins
• Composite building materials