Pdf high density polyethylene hdpecalcium silicate cs composites containing vinyltriethoxysilane treated calcium silicate contents varying from. High density polyethylene hdpe sheet this sheet can be heat formed, shaped, and welded to fabricate ducts, hoods, and much more. The effect of individual and combined particleboard dust pb dust and basalt fibers bfs on mechanical and thermal expansion performance of the filled virgin and recycled high density polyethylene hdpe composites was studied. Mechanical properties of high density polyethylenechromium. Hdpe is a hydrocarbon polymer prepared from ethylenepetroleum by a catalytic process. Low density polyethylene ldpe high degree of short and long chain branching density 30. The effects of the placement of shortchain branches scb on crystallization kinetics, morphology and mechanical properties of highdensity polyethylene hdpe are examined using bimodal blends of short s.
It is a thermoplastic with a very high strength to density ratio. Hdpe is used to make bottles for fruit juice, milk, water, kitchen cleansing products and even furniture. Chemical resistance chart for hdpe high density polyethylene the chemical resistance chart below is a general guide only. History and physical chemistry of hdpe plastics pipe.
High density closedcell polyethylene foams 450950 kgm3 were prepared by compression molding, and their flexural and tensile moduli were measured in order to study 1 the normalized modulus. Lignocellulose lc filler from the round basis of date palm leaf cultivaf content 27. Hdpes properties make it a preferred choice for a wide variety of indoor and outdoor applications such as bottles. Overview of materials for high density polyethylene hdpe, injection molded. The melting point of high density polyethylene ranges between 120 to 180 degrees celsius, however thermal properties vary with the type of polyethylene used. Considerations concerning the influence of these parameters on hdpe mechanical strength properties as a result of the predominance of. Composites of highdensity polyethylene in pellet form hdpe, 25% by weight of pw, and either 0% or 5% by weight of maleated polyethylene pellets mape, were produced by twin screw compounding followed by injection molding. The properties given below are for hdpe grades used to manufacture pipe. Split hopkinson pressure bar introduction polyethylene pe is a widely used plastic with tailorable properties based on molecular conformation. Highdensity polyethylene black gas 5 physical properties table 2 lists general physical properties of jm eagle highdensity polyethylene pipe. This research studies the effect of ultraviolet ray and the addition of chromium trioxide cro 3 on the mechanical properties in the ratio 0. Various blend ratios of high density polyethylene hdpe and ultrahighmolecularweight polyethylene uhmwpe were prepared with the objective of determining their suitability as biomaterials. Low pressure high density polyethylene in 1953, it was discovered that ethylene could be polymerised at low pressures to form a linear polymer with high density polyethylene hdpe and it resulted from the work of ziegler on the low pressure polymerisation of ethylene using organometallic catalysts. Low density polyethylene an overview sciencedirect topics.
Technical data sheet polyethylene laminated plastics. Torsion properties of high density polyethylene foams. Experimental investigation of possible use of hdpe as thermal storage material in thermal storage type solar cookers pdf. Physical property data for hdpe polyethylene pipe table 2 for data, sizes, or classes not re. High density polyethylene hdpe or polyethylene high density pehd is a thermoplastic polymer produced from the monomer ethylene. Astm d5702 mechanical properties hardness, shore d 70 70 astm d2240. It is a kind of thermoplastic which is famous for its tensile strength. Polyethylene grades low density polyethylene ldpe this extruded material offers good corrosion resistance and low moisture permeability. High density polyethylene sheet hdpe regal plastics.
Effect of the distribution of shortchain branches on. Pdf mechanical properties of high density polyethylene hdpe. The physical properties of hdpe can vary depending on the molding process that is used to. Compared to hdpe, it has a higher degree of short and long sidechain branching. It is often used to replace wood and metal as it has. Pdf highdensity polyethyleneultrahighmolecularweight. Low density polyethylene has high clarity, is chemically inert, and has good impact strength and excellent tear and stress crack resistance. Polyethylene, light, versatile synthetic resin made from the polymerization of ethylene. Maximum enhancement in tensile strength occurs at 0. Physical chemistry and mechanical properties of hdpe. Mechanical and chemical properties of high density. High density polyethylene, often abbreviated to hdpe, is a polymer whose monomer is ethylene. The ldpe is composed of 4,00040,000 carbon atoms, with many short branches.
Typical properties of polyethylene astm or ul test property ldpe hdpe uhmw physical d792 density lbin. Uhmwpe can be made through any catalyst technology, although ziegler catalysts are most common. Pdf mechanical properties of high density polyethylenemodified. The material cannot be cemented, but it is easily welded with a plastic welder. The experimental results show an improvement of hdpe. The ultra high molecular weight of utec results in excellent mechanical properties such as high abrasion resistance, impact strength and low coefficient of friction. High density polyethylene hdpe is a thermoplastic material which is. The properties of each type of pe depend on the shape and length the carbon chains and how closely they compact. High density polyethylene structure, properties, and uses. Chapter 3 material properties 47 chemical structure, which are reflected in certain differences in properties, such as density, ductility, hardness, etc. Polyethylene is a member of the important family of polyolefin resins. The graph bars on the material properties cards further below compare hdpe to. Hdpe, ultraviolet ray, cro3, mechanical properties. High density polyethylene physical properties metric english.
High density polyethylene physical properties metric english comments specific gravity 0. Pdf properties of high density polyethylene paulownia. Low density polyethylene has a good balance of flexibility, strength, barrier properties, and cost and can have a wide combination of properties. Although the presence of hdpe in the blends enabled melt. The high degree of branches with long chains gives molten ldpe unique and desirable flow properties. Hdpe is a boon to developing countries like india where it is used to prevent groundwater. Mechanical and chemical properties of high density polyethylene. For more specific values, follow the links immediately below. It can be used in applications where corrosion resistance is important, but stiffness, high temperature, and structural strength are not. 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.
Printer friendly version pdf download download as pdf excel download download to. It is a versatile product with low moisture absorption, excellent impact resistance, high tensile strength, and good chemical and corrosion resistance. It has been used in recent years for garden furniture as it resists. Resins that are produced without comonomer are called homopolymers. Ldpe is also frequently used in comsumer packaging, bags, bottles, and liners. It is sometimes called alkathene or polythene when used for hdpe pipes. With such an understanding, the piping designer can use the properties of the material to design for optimum performance.
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. 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. Mechanical properties of filled high density polyethylene article pdf available in journal of saudi chemical society 141 january 2015 with 864 reads how we measure reads. The density range of copolymers produced with hexene1 comonomer grades is 0. Highdensity polyethylene hdpe or polyethylene highdensity pehd is a thermoplastic. Engineering properties of polyethylene introduction a fundamental understanding of material characteristics is an inherent part of the design process for any piping system. Effects of microstructure on creep characteristics by joy j. Considerations concerning the influence of these parameters on hdpe mechanical strength properties as a result of the predominance of oxidative degradation or of crosslinking are presented. Hdpe is a very versatile plastic that has a wide range of applications from pipes to storage bottles. Environmental stress cracking esc can result in catastrophic failure of polyethylene.
High flow properties, good rigidity housewares, thin walled drinking cupsglasses, toys, buckets m5220 g 952 21. Hdpe high density polyethylene is defined by a density of greater or equal to 0. High density polyethylene hdpe high density polyethylene, often abbreviated to hdpe, is a polymer whose monomer is ethylene. High density polyethylene was chosen as it is a commodity polymer, easily available at economical price and easy to process. Paulownia wood pw flour was evaluated as a reinforcement for thermoplastic composites. Overview of materials for high density polyethylene hdpe matweb. Typical engineering properties of high density polyethylene.
Cheng a thesis presented to the university of waterloo in fulfillment of the thesis requirement for the degree of doctor of philosophy in. Mechanical properties of low density polyethylene pdf. The high molecular weight makes it a very tough material, but results in less efficient packing of the chains into the crystal structure as evidenced by densities of less than highdensity polyethylene for example, 0. High density polyethylene, as the name suggests, has a higher specific density than low density polyethylene, though this difference is only marginal. The plastics density can be further modified to produce medium density mdpe and ultra high molecular weight uhmwpe products. High density polyethylene hdpe sheet is designed to be used in the manufacturing and food processing industry as it is moisture, stain, and odor resistant. Mechanical and thermal properties of rhigh density. The density range of copolymer grades produced with. The properties of hdpe include three common variations. Hdpe is also nontoxic and nonstaining and meets fda and usda certification for food processing. These special properties allow the product to be used in several high performance applications.
Mechanical properties of filled high density polyethylene. It is a versatile product with low moisture absorption, excellent impact resistance, high tensile strength, and good chemical and. When compared to other plastics, the melting point of high density polyethylene. The effect of individual and combined particleboard dust pb dust and basalt fibers bfs on mechanical and thermal expansion performance of the filled virgin and recycled high density polyethylene hdpe. This slurry phase polymerization employing a superhighactivity catalyst and a tworeactor system. The plastics density can be further modified to produce medium density mdpe and ultra high molecular. Regardless of process type, the chemical process is the same. High density polyethylene injection of grade scpilex m624 mi 6. Formulations of pw flour composed of specific particle sizes. Conversely, resins with a relatively high molecular weight will yield a lower melt index. Pdf polyethylene maufacturing and its properties abdul. The material cannot be cemented, but it is easily welded with a plastic. One method produces lowdensity ldpe while a high density hdpe results from the other.
Low density polyethylene ldpe is a semirigid and translucent polymer. Hdpe highdensity polyethylene is a thermoplastic derived from petroleum. The high density polyethylene composite with recycled. Pdf an experimental approach based on the conventional universal testing machine utm was employed to perform low strain rate loading. Material safety data sheet high density polyethylene hdpe. With a high strengthto density ratio, hdpe is used in the production of plastic bottles, corrosionresistant piping, geomembranes and. From this relationship, we can associate changes in physical properties as shown in table 11 with changes in melt index of the material.
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