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Encyclopedia > Linear low density polyethylene

Linear low density polyethylene (LLDPE) is a substantially linear polymer, with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain olefins. LDPE has SPI resin ID code 4 Low-density polyethylene (LDPE) is a thermoplastic made from oil. ... POLYETHYLENE [[In the polymer industry the name is sometimes shortened to PE, . The ethylene molecule connected by a double bond, thus: Polyethylene is created through polymerization of ethylene. ... In chemistry, copolymerization is the process of using more than one monomer in the production of a polymer, resulting in a product with properties different to the homopolymer of either monomer. ... Ethylene (or IUPAC name ethene) is the simplest alkene hydrocarbon, consisting of four hydrogen atoms and two carbon atoms connected by a double bond. ... A synonym for the more widely accepted term, alkene. ...


LLDPE has higher tensile strength and higher impact and puncture resistance than LDPE. It is very flexible and elongates under stress. It can be used to make thinner films, with better environmental stress cracking resistance. It has good resistance to chemicals and to ultraviolet radiation. It has good electrical properties. However it is not as easy to process as LDPE, has lower gloss, and narrower range for heat sealing. It has been suggested that this article or section be merged into Strength of materials. ... LDPE has SPI resin ID code 4 Low-density polyethylene (LDPE) is a thermoplastic made from oil. ... Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than soft X-rays. ... Heat Sealer - Machine used to seal product packaging using heat. ...


It is used for plastic bags and sheets (where it allows using lower thickness than comparable LDPE), plastic wrap, pouches, toys, lids, pipes, buckets and containers, covering of cables, geomembranes, and mainly for flexible tubing. To meet Wikipedias quality standards, this article or section may require cleanup. ... A roll of LDPE plastic wrap in a box. ... Geosynthetics in use Geosynthetics is the umbrella term used to describe a range of generally synthetic products used to solve geotechnical problems. ...


LLDPE manufactured using metallocene catalysts is labeled mLLDPE. In chemistry, and in particular, in organometallic chemistry, a metallocene is a compound consisting of an aromatic organic ligand bound to a metal. ...


Physical Properties

Property Value
Density 0.92 g/cm³
Surface hardness SD48
Tensile strength 20 MPa
Flexural modulus 0.35 GPa
Notched izod 1.06+ kJ/m
Linear expansion 20×10−5/°C
Elongation at break 500%
Strain at yield 20%
Max. operating temp. 50 °C
Water absorption 0.01%
Oxygen index 17%
Flammability UL94 HB
Volume resistivity log(16) Ω·cm
Dielectric strength 25 MV/m
Dissipation factor 1kHz 909090
Dielectric constant 1kHz 2.3
HDT @ 0.45 MPa 45 °C
HDT @ 1.80 MPa 37 °C
Material drying NA
Melting Temp. Range 120 to 160 °C
Mould Shrinkage 3%
Mould temp. range 20 to 60 °C

See also:


  Results from FactBites:
 
Shipping bag - Patent 4681781 (4225 words)
Further, we have found that a single layer of non-oriented polyethylene between the two oriented layers reduces the utility of this invention since that laminated section of the seal between the single ply and the double ply peels away under the constant pressure exerted when bags are loaded and stacked.
In preferred embodiments of the bags according to the invention as hereinbefore and hereinafter defined the interposed layer of low density polyethylene represented as a distinct inner ply or inner wall, is formed of blown linear low density polyethylene.
The low density polyethylene inner lining or wall may, however, be also heat sealed to the cross-laminated ply intermittent over other parts of their respective facing surfaces, provided that there is not sufficient heat build-up to cause serious loss of film strength in the cross-laminated ply.
Low density polyethylene - Wikipedia, the free encyclopedia (314 words)
Low-density polyethylene (LDPE) is a thermoplastic made from oil.
It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerisation [1].
Also, since its molecules are less tightly packed and less crystalline because of the side branches, its density is lower.
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