Terminology and nomenclature iupac recommendations 2008 pdf. The length, width and depth of each item was measured at the longest edge. Hdpe has a low degree of branching and thus stronger intermolecular forces and tensile strength. Thermophysical properties of high density polyethylene.
This thermoplastic is available in a range of flexibilities depending on the production process. Fine talc filled high density polyethylene hdpe and hdpepolystyrene ps blends were extruded, injection moulded and characterized. Austin wyles shaker high school 445 watervlietshaker rd. Costeffective hdpe is a thermoplastic known for its high strengthtodensity ratio. 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. The mechanical properties of the filled hdpe were then compared to those of hdpe filled with. The mechanical properties of polymers, particularly as a function of temperature and strain rate, are key for implementation of these materials in design. The mechanical response was found to be temperature and strain rate dependent. 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. Oct 22, 2018 highdensity polyethylene is a plastic made from ethane. The results showed that blending ldpe, hdpe and pp with different proportion could improve the tensile stress up to 20% ldpe, 14% hdpe. Properties and applications of hdpe or high density polyethylene.
Volumes were calculated by multiplying the weight by an average density value for the material type. Hdpe provides a whole host of benefits to manufacturers, retailers and consumers. In this paper, the compressive response of low density polyethylene ldpe was investigated across a range of strain rates and temperatures. Pdf effect of temperature on tensile properties of hdpe pipe. Polyethylenes are characterized by their low cost, light weight, and excellent low temperature properties. High density polyethylene physical properties metric english. History and physical chemistry of hdpe atoms, and consequently, the greater the molecular weight. For more specific values, follow the links immediately below. 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. Hdpe is also nontoxic and meets fda and usda certifications for food processing. As a result, its melt viscosity is extremely high and normally can only be processed by powder sintering methods. Because of its excellent electrical properties, pe is used as a wire and cable coating material insulation and sheaths. Contact romacs engineering department at 18004269341 if you have questions about the use of our products on hdpe pipe.
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. Highdensity polyethylene, as the name suggests, has a higher specific density than lowdensity polyethylene, though this difference is only marginal. The physical properties of hdpe can vary depending on the molding process that is used to. The properties of polyethylene can be divided into mechanical, chemical. Mechanical properties of high density polyethylenechromium. Hdpe high density polyethylene is defined by a density of greater or equal to 0. There are two basic types of polyethylene, and knowing the difference between them is crucial to understanding their optical properties. 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. Review hdpe properties, chemical resistance at curbell plastics, supplier. Engineering properties of polyethylene introduction a fundamental understanding of material characteristics is an inherent part of the design process for any piping system. Other common polyethylene pe materials are mediumdensity polyethylene mdpe.
Hdpe can be translucent or opaque, and the opaque varieties are stronger. A comparison between the effect of the talc on the properties of the filled hdpe and filled 7525 hdpeps blend. Hdpe meets the standard established by food and drug regulation 21 cfr 177. The high degree of branches with long chains gives molten ldpe unique and desirable flow properties.
Typical properties of hdpe astm test method english units metric units physical properties density d1505 59. Pdf this study proposes meltblending polypropylene pp and high density polyethylene. The properties of hdpe include three common variations. High density polyethylene hdpe offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. Mechanical properties of high density polyethylene. A comparison between the effect of the talc on the properties of the filled hdpe and filled 7525 hdpeps blend showed.
Pdf mechanical properties of high density polyethylene. Low density polyethylene ldpe high degree of short and long chain branching density 30. Material properties and averages can vary from one manufacturer to another. In prac tical terms, this means hdpe pipe shrinks 10 times as. The graph bars on the material properties cards further below compare hdpe to. This is a pdf file of an unedited manuscript that has been accepted for publication. Pdf mechanical properties of hdpe filled with eggshell powder. The addition of comonomer modifies resin properties. Hdpe is a naturally opaque white because of its crystalline structure, but is also available dyed black in more limited stock sizes. Pdf heat sealing properties of linear low density polyethylene lldpe. Printer friendly version pdf download download as pdf excel download. Label printer applicator lineshaft roller conveyor logistics automation. Because of this limited breaching, hdpe is more crystalline.
It has been used in recent years for garden furniture as it resists the weather and can be cleaned very easily. Coefficient of thermal expansion is over 10 times that of di and steel and 3 times that of pvc. 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. Further, these blown films were oriented along the machine direction using either traditional machine direction orientation mdo or compression roll drawing crd mdo technology. Obvious improvement in the mechanical parameters was recorded depending on the filler type and mesh size. Typical engineering properties of high density polyethylene. Hdpe is an acronym for high density polyethylene and is a thermoplastic prepared from ethylene by a catalytic process. Polymers are used in many types of product packaging. Because of its excellent chemical resistance, pe is used for containers which stores acid, alkali and solvents.
For each property being compared, the top bar is hdpe and the bottom bar is ptfe. Some of the mechanical properties of the talc filled hdpe and talc filled 7525 hdpeps blend were deduced from stressstrain measurements. Jul 25, 2012 highdensity polyethylene, usually shortened to hdpe or pehd, is a plastic polymer with flexible properties that make it ideal for a wide range of applications. The density of hdpe can range from 930 to 970 kgm 3. In this work, the utilization of eggshell powder as an alternative filler for hdpe was attempted. Polyethylene is a whitish, semicrystalline, and effectively opaque engineering thermoplastic which, chemically, is a very high molecular weight 36 million hdpe. Properties of hdpe pipe high density polyethylene pipe hdpe has several properties that make it very different from traditional water works pipe materials. Among the factors controlling the physical properties of hdpe are mfr, density, molecular weight, molecular weight distribution, crystallinity, double bonds, branched species, etc.
Hdpe polymer is made from ethylene or ethylene and a comonomer alphaolefin 1hexene, 1butene or 1octene. Thermal analysis and ftir study of plastic films used for. Unless otherwise stated, these values represent averages taken from injection moulding samples. Hdpe manufactured by opal shall meet the requirement stipulated in is. Experimental investigation of possible use of hdpe as thermal storage material in thermal storage type solar cookers pdf. 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. Pdf preparation and compatibility evaluation of polypropylene. May 11, 2001 polyethylene is a whitish, semicrystalline, and effectively opaque engineering thermoplastic which, chemically, is a very high molecular weight 36 million hdpe. Material safety data sheet high density polyethylene. The influence of the content of hdpe on the properties and compatibility of polyblends is. 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. Because hdpe is a polyethylene polymer, its not as heatresistant as polyester film. Polyethylene is a partially crystalline solid whose properties are highly. 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.
At the time of writing, the highest standard is the. These polymers behave differently under different conditions. Additives incorporated in this product shall conform to the positive list of constituents as prescribed in is. Pdf on the effect of carbon black on mechanical properties of. Typical physical properties of high density polyethylene hdpe. The molecular structure of hdpe is a linear backbone of the repeating unit ch 2ch 2 n with a slight degree of branching. Mechanical properties of high density polyethylenemodified calcium silicate composites article pdf available in silicon 63. Typical material physical properties of driscoplex pe4710 3408 high density polyethylene materials property unit test procedure typical value material designation ppi tr4 pe4710 cell classification astm d3350 445474c pipe properties density gms cm 3 astm d1505 0.
Mechanical properties and molecular structures of virgin and. Also, polyethylenes exhibit excellent resistance to gamma rays in atomic radiation and is. Hdpe is easily machined, welded and thermoformed for easy fabrication. However, care should be taken in those cases in which stress is applied to pe for a long period of time. Typical reactions for chain assembling are polyaddition continuous or step wise and condensation polymerization polycondensation 1 figure 1. 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. Heat sealing properties of lldpe namely, heat seal strength and hot tack. High density polyethylene pipe hdpe has several properties that make it very different from traditional water works pipe materials. Thermal analysis and ftir study of plastic films used for packaging. Polyethylene or polythene is the most common plastic. Where hdpe excels is in low temperature applications. Tap plastics typical properties of hdpe mm opaque sheets properties astm test method units typical values density d792 gcm3 0.
With such an understanding, the piping designer can use the properties of the material to design for optimum performance. The filler varied from 5% to 25% by weight in the composite. In practical terms, this means hdpe pipe shrinks 10 times as much as di and 3 times as. Overview of materials for high density polyethylene hdpe. Polyethylene is a thermoplastic material produced by polymerizing ethylene gas with a catalyst in a reactor. Hdpe is a very commonly recycled type of plastic and is well accepted in most recycling centers. It has a waxy finish leveraged for lowfriction applications. Hdpe is used to make bottles for fruit juice, milk, water, kitchen cleansing products and even furniture. Additives incorporated in this product shall conform to the positive list.
It is used to make bottles, jugs and other containers used as shortterm storage for milk, detergent and bleach. In the uk, for example, around four billion hdpe milk bottles are produced and purchased each year. The physical properties of the obtained pyrolytic oil were close to those of mixture of. Mechanical properties of filled high density polyethylene. These properties are given as reference without any obligation or liability on behalf of precision punch and plastics. Yes, but not as good as those of polyester film products. Thermolysis of highdensity polyethylene to petroleum products.
High density polyethylene, fda compliant, is used for industrial chemical tanks, machined into fabricated parts and industrial size cutting boards. But the three basic physical properties factors that regulate physical properties are molecular weight, molecular weight distribution and density. Highdensity polyethylene hdpe is uniform at the molecular level, which enables the molecules to pack tightly and form crystalline patches. Hdpe can be cooled down to 100 degrees fahrenheit without becoming brittle. Effect of temperature on characteristics a new design prosthetic foot by 3d printer. High density polyethylene hdpe plastic bottles are a popular packaging choice for the milk and fresh juice markets. Product safety assessment high density polyethylene hdpe resins. The chemical analysis of the hdpe pyrolytic oil showed the presence of functional groups such as. This property data is a summary of similar materials in the matweb. With such an understanding, the piping designer can use the properties of. Pdf hdpe effects on the heat sealing properties of lldpe. Mechanical and chemical properties of high density polyethylene. Mechanical properties of hdpe m624 with three filler inorganic and organic composites were assessed with respect to the effect of the filler content.
Hdpe is the most rigid among the three common pes and has a density ranging from. Contact romacs engineering department at 18004269341 if you have questions about the. In this study, blown films were produced from three different high density polyethylene hdpe resins. Product safety assessment high density polyethylene hdpe. Please note that the two materials have significantly dissimilar densities. Polyethylene physical properties in relation to polymer density. These polymers are either amorphous or semicrystalline.
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. Highdensity polyethylene is a plastic made from ethane. Material safety data sheet high density polyethylene hdpe. Highdensity polyethylene hdpe or polyethylene highdensity pehd is a thermoplastic. A definitive quality guarantee is given in our generalconditions of sales. The molecular weight, the molecular weight distribution and the amount of branching determine many of the mechanical and chemical properties of the end product. Mechanical and chemical properties of high density. High density polyethylene physical properties metric english comments specific gravity 0. Hdpe is known for its high strengthtodensity ratio. Machine direction orientation of high density polyethylene.