The properties of polyethylene can be divided into mechanical, chemical. Polymer services group provides expert advice, consultation, and legal testimony to major multinational corporate clients on programs involving polymer development, product design and engineering, and process development. Contact romacs engineering department at 18004269341 if you have questions about the use of our products on hdpe pipe. Effects of microstructure on creep characteristics by joy j. Oct 22, 2018 highdensity polyethylene is a plastic made from ethane. The properties of hdpe include three common variations. Heat sealing properties of lldpe namely, heat seal strength and hot tack. Mechanical properties of high density polyethylenemodified calcium silicate composites article pdf available in silicon 63. High density polyethylene hdpe offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. Hdpe can be cooled down to 100 degrees fahrenheit without becoming brittle. The filler varied from 5% to 25% by weight in the composite. These polymers behave differently under different conditions. Hdpe is known for its high strengthtodensity ratio.
Costeffective hdpe is a thermoplastic known for its high strengthtodensity ratio. High density polyethylene physical properties metric english comments specific gravity 0. The addition of comonomer modifies resin properties. High density polyethylene hdpe plastic bottles are a popular packaging choice for the milk and fresh juice markets. Although the density of hdpe is only marginally higher than that of lowdensity polyethylene, hdpe has little branching, giving it stronger intermolecular forces and tensile strength than ldpe. Pdf heat sealing properties of linear low density polyethylene lldpe. Thermal analysis and ftir study of plastic films used for packaging. Pdf preparation and compatibility evaluation of polypropylene. History and physical chemistry of hdpe atoms, and consequently, the greater the molecular weight. Product safety assessment high density polyethylene hdpe. Overview of materials for high density polyethylene hdpe, extruded, this property data is a summary of similar materials in the matweb database for the category high density polyethylene hdpe, extruded.
Thermophysical properties of high density polyethylene. Please note that the two materials have significantly dissimilar densities. Hdpe is easily machined, welded and thermoformed for easy fabrication. Polyethylene is a whitish, semicrystalline, and effectively opaque engineering thermoplastic which, chemically, is a very high molecular weight 36 million hdpe. Austin wyles shaker high school 445 watervlietshaker rd. For each property being compared, the top bar is hdpe and the bottom bar is ptfe. Thermolysis of highdensity polyethylene to petroleum products. Hdpe is a ubiquitous material with versatile properties and is widely used due to its mechanical strength, low cost, excellent biocompatibility, easy process ability and resistance to chemical and biological attack. There are two basic types of polyethylene, and knowing the difference between them is crucial to understanding their optical properties.
Pdf effect of temperature on tensile properties of hdpe pipe. Pdf the properties that make plastic of direct interest to designers and. Polyethylene or polythene is the most common plastic. The mechanical properties of the filled hdpe were then compared to those of hdpe filled with. Hdpe is also nontoxic and meets fda and usda certifications for food processing. The mechanical response was found to be temperature and strain rate dependent. This property data is a summary of similar materials in the matweb. Where hdpe excels is in low temperature applications. The nominal properties reported herein are typical of the product but do not reflect normal testing variance and therefore should not be used for specification purposes. Mechanical properties of filled high density polyethylene.
Hdpe manufactured by opal shall meet the requirement stipulated in is. Material safety data sheet high density polyethylene hdpe. Among the factors controlling the physical properties of hdpe are mfr, density, molecular weight, molecular weight distribution, crystallinity, double bonds, branched species, etc. High density polyethylene physical properties metric english. In this paper, the compressive response of low density polyethylene ldpe was investigated across a range of strain rates and temperatures. Label printer applicator lineshaft roller conveyor logistics automation.
The mechanical properties of polymers, particularly as a function of temperature and strain rate, are key for implementation of these materials in design. Effect of temperature on characteristics a new design prosthetic foot by 3d printer. In the uk, for example, around four billion hdpe milk bottles are produced and purchased each year. Hdpe high density polyethylene is defined by a density of greater or equal to 0. Properties and applications of hdpe or high density polyethylene. Properties of hdpe pipe limitations of romac products for use on hdpe pipe romac cannot warrant products used in applications that are outside one or more of these limitations. Terminology and nomenclature iupac recommendations 2008 pdf. Additives incorporated in this product shall conform to the positive list. Hdpe high density polyethylene after its experimental preparation in the 1930s, the application in high frequency radar cables during world war ii, gave impetus to its commercial production. Overview of materials for high density polyethylene hdpe. In practical terms, this means hdpe pipe shrinks 10 times as much as di and 3 times as.
The results showed that blending ldpe, hdpe and pp with different proportion could improve the tensile stress up to 20% ldpe, 14% hdpe. Mechanical properties of hdpe m624 with three filler inorganic and organic composites were assessed with respect to the effect of the filler content. Tap plastics typical properties of hdpe mm opaque sheets properties astm test method units typical values density d792 gcm3 0. A comparison between the effect of the talc on the properties of the filled hdpe and filled 7525 hdpeps blend showed. Engineering properties of polyethylene introduction a fundamental understanding of material characteristics is an inherent part of the design process for any piping system.
As a result, its melt viscosity is extremely high and normally can only be processed by powder sintering methods. These properties are given as reference without any obligation or liability on behalf of precision punch and plastics. Because of this limited breaching, hdpe is more crystalline. The global market for hdpe in 2007 is around 30 million tons. Typical properties of hdpe astm test method english units metric units physical properties density d1505 59. For more specific values, follow the links immediately below. This thermoplastic is available in a range of flexibilities depending on the production process.
The high degree of branches with long chains gives molten ldpe unique and desirable flow properties. Highdensity polyethylene is a plastic made from ethane. Polyethylenes are characterized by their low cost, light weight, and excellent low temperature properties. This is a pdf file of an unedited manuscript that has been accepted for publication.
Hdpe is an acronym for high density polyethylene and is a thermoplastic prepared from ethylene by a catalytic process. Polyethylene is a thermoplastic material produced by polymerizing ethylene gas with a catalyst in a reactor. Polymers are used in many types of product packaging. A definitive quality guarantee is given in our generalconditions of sales. Pdf this study proposes meltblending polypropylene pp and high density polyethylene. At the time of writing, the highest standard is the. Pdf hdpe effects on the heat sealing properties of lldpe. The length, width and depth of each item was measured at the longest edge.
In prac tical terms, this means hdpe pipe shrinks 10 times as. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume. May 11, 2001 polyethylene is a whitish, semicrystalline, and effectively opaque engineering thermoplastic which, chemically, is a very high molecular weight 36 million hdpe. Typical engineering properties of high density polyethylene.
Review hdpe properties, chemical resistance at curbell plastics, supplier. The chemical analysis of the hdpe pyrolytic oil showed the presence of functional groups such as. With such an understanding, the piping designer can use the properties of the material to design for optimum performance. Machine direction orientation of high density polyethylene. Because of its excellent electrical properties, pe is used as a wire and cable coating material insulation and sheaths. Hdpe polymer is made from ethylene or ethylene and a comonomer alphaolefin 1hexene, 1butene or 1octene. Hdpe provides a whole host of benefits to manufacturers, retailers and consumers. Product safety assessment high density polyethylene hdpe resins. Pdf mechanical properties of hdpe filled with eggshell powder. Highdensity polyethylene hdpe or polyethylene highdensity pehd is a thermoplastic.
Other common polyethylene pe materials are mediumdensity polyethylene mdpe. Typical reactions for chain assembling are polyaddition continuous or step wise and condensation polymerization polycondensation 1 figure 1. Mechanical properties of high density polyethylenechromium. Together with the capability of enduring years of ultraviolet exposure from the sun, ridged slats also utilize a unique locking feature, which secures the product firmly in. These polymers are either amorphous or semicrystalline. Typical physical properties of high density polyethylene hdpe physical properties of high density polyethylene are represented as typical information contained herein is considered accurate to the best of our knowledge. Hdpe has a low degree of branching and thus stronger intermolecular forces and tensile strength. Volumes were calculated by multiplying the weight by an average density value for the material type.
Hdpe is a naturally opaque white because of its crystalline structure, but is also available dyed black in more limited stock sizes. Mechanical and chemical properties of high density polyethylene. But the three basic physical properties factors that regulate physical properties are molecular weight, molecular weight distribution and density. The molecular structure of hdpe is a linear backbone of the repeating unit ch 2ch 2 n with a slight degree of branching. Hdpe meets the standard established by food and drug regulation 21 cfr 177. Unless otherwise stated, these values represent averages taken from injection moulding samples. Low density polyethylene ldpe high degree of short and long chain branching density 30. Highdensity polyethylene, as the name suggests, has a higher specific density than lowdensity polyethylene, though this difference is only marginal. Printer friendly version pdf download download as pdf excel download. Pdf on the effect of carbon black on mechanical properties of. Mechanical properties of high density polyethylene. Additives incorporated in this product shall conform to the positive list of constituents as prescribed in is.
Properties of hdpe pipe high density polyethylene pipe hdpe has several properties that make it very different from traditional water works pipe materials. In this study, blown films were produced from three different high density polyethylene hdpe resins. High density polyethylene, fda compliant, is used for industrial chemical tanks, machined into fabricated parts and industrial size cutting boards. Hdpe is used in a variety of applications and industries where high tensile strength, low moisture absorption and chemical and corrosion resistance properties are required. Some of the mechanical properties of the talc filled hdpe and talc filled 7525 hdpeps blend were deduced from stressstrain measurements. Mechanical properties and molecular structures of virgin and. Hdpe can be translucent or opaque, and the opaque varieties are stronger.
Further, these blown films were oriented along the machine direction using either traditional machine direction orientation mdo or compression roll drawing crd mdo technology. Typical physical properties of high density polyethylene hdpe. High density polyethylene pipe hdpe has several properties that make it very different from traditional water works pipe materials. Hdpe is a very commonly recycled type of plastic and is well accepted in most recycling centers. It has been used in recent years for garden furniture as it resists the weather and can be cleaned very easily. The influence of the content of hdpe on the properties and compatibility of polyblends is. The physical properties of hdpe can vary depending on the molding process that is used to. A comparison between the effect of the talc on the properties of the filled hdpe and filled 7525 hdpeps blend. Because of its excellent chemical resistance, pe is used for containers which stores acid, alkali and solvents.
Material safety data sheet high density polyethylene. Contact romacs engineering department at 18004269341 if you have questions about the. Polyethylene is a partially crystalline solid whose properties are highly. Yes, but not as good as those of polyester film products.
The density of hdpe can range from 930 to 970 kgm 3. Experimental investigation of possible use of hdpe as thermal storage material in thermal storage type solar cookers pdf. The graph bars on the material properties cards further below compare hdpe to. With such an understanding, the piping designer can use the properties of. Thermal analysis and ftir study of plastic films used for. Because hdpe is a polyethylene polymer, its not as heatresistant as polyester film. Coefficient of thermal expansion is over 10 times that of di and steel and 3 times that of pvc. Pdf mechanical properties of high density polyethylene. It has a waxy finish leveraged for lowfriction applications. However, care should be taken in those cases in which stress is applied to pe for a long period of time. Highdensity polyethylene hdpe is uniform at the molecular level, which enables the molecules to pack tightly and form crystalline patches. The physical properties of the obtained pyrolytic oil were close to those of mixture of. In this work, the utilization of eggshell powder as an alternative filler for hdpe was attempted.
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