High density polyethylene hdpe or polyethylene high density pehd is a thermoplastic polymer produced from the monomer ethylene. Piping made from polyethylene is a cost effective solution for a broad range of piping problems in municipal, industrial, marine, mining, landfill, duct and agricultural applications. This paper reports an investigation about the effect of high density polyethylene hdpe in powder form as a bitumen modifier on the permanent deformation of asphalt concrete using marshall design. Hdpe has a higher molecular weightthe molecules have more monomer units the density is actually a bit higher because it is more crystalline, it is harder and more brittle and has higher tensile strength. What is high density polyethylene hdpe plastics make it.
This report covers the technology and costs of manufacturing high density polyethylene hdpe. It is a kind of thermoplastic which is famous for its tensile strength. The different structures have names associated with their respective densities i. Hdpe is a hydrocarbon polymer prepared from ethylenepetroleum by a catalytic process. Browse hdpe high density polyethylene sheet in the trident plastics, inc. High density polyethylene hdpe latest price, manufacturers. In fact, polyethylene pipe has a long and distinguished history of service to the gas, oil, mining and other industries. Low density polyethylene ldpe is a very flexible material with unique flow properties that makes it particularly suitable for shopping bags and other plastic film applications. Polyethylene is the most common form of plastic in the world and can be processed in a number of ways to make it thin, flexible, fluffy or strong and hard such as with hdpe. Hdpe is manufactured at low temperatures and pressures, using zieglernatta and metallocene catalysts or activated chromium oxide known as a phillips catalyst. Low density polyethylene ldpe high degree of short and long chain branching density 30. Earthfriendly high density polyethylene hdpe is a durable polyolefin, resistant to most solvents and temperature variation. Feb 20, 2012 hdpe high density polyethylene has a density of greater or equal to 0. What is fascinating is how close the densities actually are to each other.
With a high strengthto density ratio, hdpe is used in the production of plastic bottles, corrosionresistant piping, geomembranes and. It is the most widely used plastic in the world, being made into products ranging from clear food wrap and shopping bags to detergent bottles and fuel tanks. The double bonds in monomers break and they join to form a big molecule. Pdf polyblend films were prepared from highdensity polyethylene hdpe and polyllactic acid plla up to 20% plla by the melt. It is sometimes called alkathene or polythene when used for hdpe pipes. Highdensity polyethylene hdpe or polyethylene highdensity pehd is a thermoplastic. Sep 15, 2015 the high density polyethylene hdpe and low density polyethylene ldpe have different mechanical properties such as the crystal structure, the magnitude and nature of branching and the molecular weight.
Lldpe linearlow density polyethylene is defined by a density range of 0. Compared to hdpe, it has a higher degree of short and long sidechain branching. High density polyethylene, as the name suggests, has a higher specific density than low density polyethylene, though this difference is only marginal. Jmm manufactures high density polyethylene hdpe water pressure pipes for municipal and industrial transmission systems. Hdpe is a very versatile plastic that has a wide range of applications from pipes to storage bottles.
Known for its large strength to density ratio, hdpe is commonly used in the production of plastic bottles, corrosionresistant piping, geo membranes, and plastic lumber. High density polyethylene or hdpe is a commonly used petroleum thermoplastic and the most used of the three polyethylenes for a wide range of applications. Hdpe is a plastic that has applications in the manufacture of blowmolded and injec tionmolded goods, film, and plastic pipe. Typical engineering properties of high density polyethylene. Just as pvc and cpvc are kissing cousins in the polymer world, ldpe and hdpe have a lot in common and many differences, too. It is an enormously versatile polymer which is suited to a wide range of applications from heavyduty damp proof membranes for new buildings to light, flexible bags and films. Uhmwpe, in comparison, has a viscosity average molecular weight of 6,000,000 gmol. Polyethylene high density hdpe polyethylene polythene is one of the worlds most popular plastics. Effects of microstructure on creep characteristics by joy j. The high density polyethylene composite with recycled. Chemical resistance chart for hdpe high density polyethylene. High density polyethylene manufacturing process sciencing. High density polyethylene hdpe is a longchain polymer or plastic.
Ldpe has high ductility but low tensile strength, which is evident in the real world by its propensity to stretch when strained. Technical data sheet polyethylene laminated plastics. Mdpe medium density polyethylene is defined by a density range of 0. High density polyethylene hdpe or polyethylene high density pehd is a polyethylene thermoplastic made from petroleum.
In fact, the molecular weight is so ultrahigh that it cannot be measured directly by conventional means and must instead be inferred by its intrinsic. This thermoplastic is made from a string of ethylene molecules hence, the poly part of polyethylene, and is known for being both lightweight and strong. Applications include potable water, pressurized sanitary sewers, oil and gas pipelines, slurry and. It has been tested and proven effective for above ground, surface, buried, sliplined, floating, and subsurface marine applications. Environmental stress cracking esc can result in catastrophic failure of polyethylene. Addition polymers and their uses igcse and ial chemistry. Cheng a thesis presented to the university of waterloo in fulfillment of the thesis requirement for the degree of doctor of philosophy in. Hdpe is primarily used for woodplastic composites such as plastic lumber. It has the lowest repair frequency per mile of pipe per year. Low density polyethylene ldpe is a semirigid and translucent polymer.
Not only is it one of the most versatile of plasticsused in everything from hard hats to house wrapsits also widely recycled, in both its rigid form e. Polythene and environment article pdf available in environmental sciences. High density polyethylene hdpe representing the largest portion of the polyethylene applications, hdpe offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. Highdensity polyethylene wikimili, the best wikipedia reader. Pdf mechanical and morphological properties of high density. Hdpe high density polyethylene sheet, opaque offwhite, standard tolerance, astm d4976245, 0. Hdpe is known for its high strengthto density ratio. Addition polymers are a type of polymer in which all the monomers are unsaturated or to simply to say are alkenes.
Mechanical and chemical properties of high density polyethylene. Acetaldehyde gf diethyl benzene fn methyl ethyl ketone nn acetamide, sat. Metallocene linear low density polyethylene mlldpe refers to tougher lldpe type polymer with a density between about 0. History and physical chemistry of hdpe plastics pipe. The ldpe is composed of 4,00040,000 carbon atoms, with many short branches. Polyethylene pe is a thermoplastic that contains chains of the. For more business information about hdpe and other.
High density polyethylene hdpe is a linear polymer with a molecular weight of up to 200,000 gmol. The polymer is a long chain molecule which is formed by joining many small molecules called monomers. High density polyethylene hdpe sheet this sheet can be heat formed, shaped, and welded to fabricate ducts, hoods, and much more. May 21, 2015 yes, i love polypropylene and polyester and silicones and all sorts of other plastics. In other words, hdpe and ldpe are considered as the contrasting ends of the plastics applications spectrum. When compared to other plastics, the melting point of high density polyethylene. Grafix stocks many sizes and finishes of hdpe sheets and can customize for your color, thickness and finishing needs. High density polyethylene hdpe refers to polymer with. If you look at this plastic under a microscope, you would see that it has a linear structure with few branches lending to its optimal strength density ratio. High density polyethylene hdpe is the most rigid of the three basic types of polyethylene resins, which also include ldpe and linear low density polyethylene lldpe.
High density polyethylene, often abbreviated to hdpe, is a polymer whose monomer is ethylene. Our pressure pipe is used in many types of applications such as potable water. Product safety assessment high density polyethylene hdpe resins. Difference between hdpe and ldpe compare the difference. Material safety data sheet high density polyethylene hdpe. Mechanical and chemical properties of high density. But highdensity polyethylene or hdpe plastic has been courting my favor recently. It is a thermoplastic with a very high strength to density ratio. Hdpe high density polyethylene sheet on trident plastics, inc. Other articles where highdensity polyethylene is discussed. Jmm high density polyethylene hdpe pe4710 product specification description. Polyethylene grades high density polyethylene hdpe representing the largest portion of the polyethylene applications, hdpe offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength.
Density of polyethylene global plastic sheeting, inc. First aid measures general information at room temperature the product is neither an irritant nor gives off hazardous vapours. Hdpe is a boon to developing countries like india where it is used to prevent groundwater. Pdf polyethylene maufacturing and its properties abdul. High density polyethylene hdpe sheets grafix plastics. High density polyethylene definition, polyethylene consisting mainly of linear, or unbranched, chains with high crystallinity and melting point, and density of 0. With more and more companies embracing sustainability initiatives, hdpe sheet popularity has. Highdensity polyethylene definition of highdensity.
Pdf sorption of polycyclic aromatic hydrocarbons pahs to. Jun 23, 2016 while there are many types of pe, two mostcommon ones are lowdensity polyethylene ldpe and highdensity polyethylene hdpe. Sorption of polycyclic aromatic hydrocarbons pahs to low and high density polyethylene pe article pdf available in environmental science and pollution research 194. Polyethylene, light, versatile synthetic resin made from the polymerization of ethylene. Medium density polyethylene mdpe refers to polymer with a density between 0. Hdpe can be processed by a wide variety of thermoplastic processing methods and is particularly useful where moisture resistance and low cost are required. High density polyethylene liners for rehabilitation of. High density polyethylene hdpe is a costeffective thermoplastic with linear structure and no or low degree. High density polyethylene hdpe resins are polymers of ethylene or copolymers. High density polyethylene pipe hdpe can carry potable water, wastewater, slurries, chemicals, hazardeous wastes, and compressed gases. The material cannot be cemented, but it is easily welded with a plastic welder. High density polyethylene plastic is most commonly known and referred to as hdpe sheet plastic.
How do highdensity polyethylene hdpe and lowdensity. Jul 25, 2012 high density polyethylene, usually shortened to hdpe or pehd, is a plastic polymer with flexible properties that make it ideal for a wide range of applications. High density polyethylene structure, properties, and uses. The lack of branches in its structure allows the polymer chains to pack closely together, resulting in a dense, highly crystalline. They exhibit attributes of toughness, flexibility, chemical resistance and. Chemical resistance chart for hdpe high density polyethylene the chemical resistance chart below is a general guide only.
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