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Polyethylene PE Film - How it
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MYOG low-density polyethylene (LDPE) tarptent - Part 2
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Wicketed Bread Bags -  Low Density Polyethylene
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MYOG low-density polyethylene (LDPE) tarptent - Part 1
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Crystalisation of Low Density Polyethylene (LDPE)
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Polymer Detectives - Science Olympiad - Video 2 - HDPE, LDPE, PP
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::2012/01/09::
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Double colors strip Film Blowing machine(HDPE / LDPE film)
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Das Band - Fine Polyethylene Extruder.
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cell trays
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Bag Making at Reynopoly Ltd
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heavy gauge thermoforming
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6 lines sealing and cutting bag machine-- Zhejiang Zhuxin Machinery Co.,ltd.
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::2012/09/26::
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FXR FAST Floatation Assistance Technology
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FRANCIS Tristan, Polyethylene VLOG
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LDPE or Glass,which is better?Choose!
LDPE or Glass,which is better?Choose!
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High Density Polyethylene Mortar tube
High Density Polyethylene Mortar tube
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Graf Gs IX Gloves
Graf Gs IX Gloves
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High Density Polyethylene
High Density Polyethylene
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VERSAPIPE FUSION | Butt and Electro Fusion "SUMMARIZED"
VERSAPIPE FUSION | Butt and Electro Fusion "SUMMARIZED"
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From Wikipedia, the free encyclopedia
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LDPE has SPI resin ID code 4

Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization.[1] Its manufacture employs the same method today. The EPA estimates 5.7% of LDPE (recycling number 4) is recycled.[2] Despite competition from more modern polymers, LDPE continues to be an important plastic grade. In 2009 the worldwide LDPE market reached a volume of US$22.2 billion (15.9 billion).[3]

Properties[edit]

LDPE is defined by a density range of 0.910–0.940 g/cm3. It is not reactive at room temperatures, except by strong oxidizing agents, and some solvents cause swelling. It can withstand temperatures of 80 °C continuously and 95 °C for a short time. Made in translucent or opaque variations, it is quite flexible, and tough but breakable.[citation needed]

LDPE has more branching (on about 2% of the carbon atoms) than HDPE, so its intermolecular forces (instantaneous-dipole induced-dipole attraction) are weaker, its tensile strength is lower, and its resilience is higher. Also, since its molecules are less tightly packed and less crystalline because of the side branches, its density is lower. LDPE contains the chemical elements carbon and hydrogen.

Chemical resistance[edit]

Applications[edit]

A GEECO bowl, c.1950, still used in 2014.

LDPE is widely used for manufacturing various containers, dispensing bottles, wash bottles, tubing, plastic bags for computer components, and various molded laboratory equipment. Its most common use is in plastic bags. Other products made from it include:

See also[edit]

References[edit]

External links[edit]

2010_MSW_Tables_and_Figures_508.pdf. epa.gov

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