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HDPE — low-pressure polyethylene: properties and applications

HDPE stands for High-Density Polyethylene. Internationally, this material is known by the same abbreviation — HDPE. Thanks to its unique properties, HDPE is widely used in many industries — from packaging to construction and agriculture. It is known for its high strength, wear resistance, and durability under external conditions.

What is HDPE?

High-Density Polyethylene is produced by polymerizing ethylene at low pressure (2–10 atm) and temperatures between 70–150°C using Ziegler–Natta or metallocene catalysts. This production method creates a polymer with a linear molecular structure and a density above 0.941 g/cm³.

With minimal branching, HDPE molecules are tightly packed, which ensures high tensile strength, rigidity, and resistance to mechanical stress.

Main Properties of HDPE

  • High puncture and tear resistance — ideal for heavy and bulky packaging;
  • Chemical resistance — unaffected by acids, alkalis, oils, and most organic solvents;
  • Cold resistance — remains elastic down to -60°C;
  • Low water absorption and gas permeability;
  • Durability — HDPE pipes and products can last over 50 years;
  • Recyclability — HDPE can be recycled multiple times while retaining its properties.

Where is HDPE used?

  • Packaging industry — for T-shirt bags, pouches, and product packaging;
  • Construction — HDPE pipes for water supply, sewage, gas, and waterproofing applications;
  • Agriculture — water tanks, fertilizer containers, irrigation pipes;
  • Industry — technical containers, bulk tanks, pallets;
  • Household — plastic furniture, food containers, household goods.

Benefits of Using HDPE

  • High mechanical strength and impact resistance;
  • Cost-effective due to long service life;
  • Lightweight yet durable;
  • Eco-friendly — recyclable and reusable;
  • Food-safe (when using food-grade HDPE);
  • UV resistant when modified with special additives.

Difference Between HDPE and LDPE

HDPE (High-Density Polyethylene) and LDPE (Low-Density Polyethylene) differ in molecular structure and properties:

  • HDPE — denser and more rigid, less flexible but significantly stronger;
  • LDPE — softer and more elastic, better for food and lightweight packaging, but less puncture-resistant.

The choice between HDPE and LDPE depends on required flexibility, strength, and the final product's purpose.

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HDPE Bags from Cherpack

At cherpack.net, you can order HDPE bags in bulk — strong, lightweight, and customizable with branding. We offer standard and custom sizes tailored to your business needs. Quality packaging from Cherpack means reliable delivery every time!