Plastic corporation carries an extensive line of ldpe, hdpe and pp sheet. Hdpe corrugated pipe service life corrugated stress. Highdensity polyethylene hdpe resins are well suited for a range of extrusion film applications such as grocery, garbage and deepfreezer bags 10 to 25 microns and injection, blown and rotational. The scr tests were performed on the finished pipe at the liner and junction locations. They feature various combinations of stiffness and toughness. Dk plastics midwest plastic sheet extruder and theromformer. Grace hsuan, jy zhang and wk wong department of civil, architectural and environmental engineering, drexel university. Crack resistance escr of high density polyethylene hdpe. Experimental study of stress cracking in high density polyethylene. Some copolymers of ldpe are available with improved stress crack resistance. Because parts made with vistamaxx enhanced hdpe are tougher than those made with pure hdpe, they are less likely to fail through environmental stress cracking.
Resistance to this mode of failure can be best gauged through constanttensileload testing, while taking into account the differences in yield point among various polyethylenes. High density polyethylene hdpe sheets grafix plastics. Hdpe is also nontoxic and nonstaining and meets fda and usda certification for food. Strain hardening modulus as a measure of environmental stress. Escr problems get more pronounced in the summer, because of several factors related to increased heat and humidity. Waterproof geomembrane hdpe plastic roll sheet pe liner buy. Consider using an internal z or h divider during this season. It can lead to a catastrophic breakdown or failure of a plastic material or part. Technical note stress crack resistance for geomembrane products the stress crack resistance scr of polyethylene pe geomembranes has been the subject of study since the introduction of the materials over 20 years ago. A controlled notch is cut horizontally across each. Available colors all plastics available in custom colors, sizes, and additives. Hdpe 300 sheet has good chemical stability and resistant to most acid, alkali, organic solution and water erosion, good.
Hdpehdpp highdensity polyethylene and highdensity polypropylene is also nontoxic and nonstaining. Geomembrane stress cracking resistance depending on the. The phenomenon of stress cracking in polyethylene sheets. Environment stress cracking of hdpe products is quite common due to its semi crystalline nature which gets attacked due to chemicals present in the environment. Environmental stress cracking resistance of plastics 2001. Poor stresscrack resistance always comes from degraded preform iv. I am looking for appropriate method for chemical resistance of plastics environmental stress cracking resistance. Evaluate the longterm stress crack resistance of corrugated hdpe pipes y. Hdpe grades are used in a variety of processing techniques such as extrusion, extrusion blow molding, injection and rotational molding. Hdpes are classified as either homopolymers which are stiffer, and copolymers which are more stress crack resistant. Dielectric properties and environmental stress crack resistance are also good. Tel 610 522 drexel fax 610 5228441 geosynthetic institute. Environmental stress cracking resistance of plastics.
This polyethylene resin is designed specifically for flexible geomembrane applications. Hdpe was known by people for a step by step because it has many unique and useful properties. It is good electrical and thermal insulator and has a selfextinguishing per ul test 94. Technical note stress crack resistance for geomembrane products. However, that is not a really practical proposition in many cases and therefore the best solution is to use a polyethylene pe that is more resistant to esc. Corrugated hdpe pipe is the most widelyused plastic pipe for gravity flow water. Seiler plastics manufactures polypropylene sheet is a lightweight, chemical and heat resistant plastic that offers an excellent balance of thermal, chemical and electrical. Over the past decade, highdensity polyethylene hdpe materials have. Custom sizes available, call us for options and minimums. Slow crack resistance in polyethylene has been reported extensively in the literature 19,19. The notched constant ligament stress ncls test astm 2163 was used for the pipe liner assessment.
While this can occur under high stress conditions, one of the most common forms of failure for plastic components is low stress failure. Polyvinyl chloride pvc polyvinyl chloride is a widelyused plastic. Also referred to as plastic plywood, hdpe hdpp highdensity polyethylene and highdensity polypropylene sheet goods offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. Grace hsuan, jy zhang and wk wong department of civil, architectural and environmental engineering, drexel university, philadelphia, usa. Typically, in a well optimized and controlled injection. Hdpe high density pe not normal polyetyline liners are ideal choice for most dam applications.
Waterproof geomembrane hdpe plastic roll sheet pe liner, find complete details about waterproof geomembrane hdpe plastic roll sheet pe liner,pe liner, hdpe plastic roll sheet,waterproof geomembrane from geomembranes supplier or manufacturershandong tengkun environmental technology co. Pdf stress cracking resistance of hdpe geomembranes with very. Pfa m fm4910 high service temperature sheet is a copolymer plastic sheet made from tetrafluoroethylene and perfluorinated methyl vinyl ether, which offers high flexural resistance. Hdpe highdensity polyethylene sheets offer excellent impact resistance, light weight, low moisture absorption, and high tensile strength. Clear plastic sheet with excellent drape and blister forming characteristics 2 eva optek flex family, proflex, orfitrans soft, flexible copolymer with lowtemperature toughness, and stresscrack resistance 3 hdpe easy to fabricate, durable, lightweight, low cost plastic material 5 high impact polystyrene orfitrans stiff. The bent strip test is a constant strain test, but polyethylene relaxes when strained. Environmental stress cracking resistance of polyethylene. Typically, in a well optimized and controlled injection process, the iv degrades only about 0.
Basic understanding of stress cracking in hdpe products. Excellent corrosion resistance to a wide range of item. Polypropylene plastic sheets are the choice plastic for. Gps hd 40 mil hdpe plastic sheeting for root barrier, pit liners, soil remediation, canal liner. Waterproof geomembrane hdpe plastic roll sheet pe liner, find complete details about waterproof geomembrane hdpe plastic roll sheet pe liner,pe liner,hdpe plastic roll. Polyethylene, including hdpe sheets, requires few natural resources to produce, generates minimal waste products, and is widely recycled. Hdpe geomembranes, stress cracking, accelerated tests. Gps hd 40 mil is a smooth, high quality, high density polyethylene hdpe geomembrane produced from specially formulated, virgin polyethylene resin. According to astm d883, stress cracking is defined as an external or internal crack in a plastic caused by tensile stresses less than its shortterm mechanical. Hdpe is appropriate for personal care, beverages, food and chemicals. Environmental stress cracking esc can be avoided if the hdpe is not subjected to environments or installations that place the sheet in tension.
D 5596, standard practice for microscopical examination of pigment. Waterproof geomembrane hdpe plastic roll sheet pe liner. Gps hd smooth has proven itself in industrial, agricultural and municipal projects. Also referred to as plastic plywood, hdpehdpp highdensity polyethylene and highdensity polypropylene sheet goods offers excellent impact resistance, light weight, low moisture.
Investigations on environmental stress cracking resistance of. Hdpe is well suited for applications where a greater tensile and compression strength is needed. Which type of plastic sheet do i need for my application. Abs sheet is a plus general purpose, low cost material that works well for applications such as aircraft interior trim, cassette holders, tote bins and trays, automotive parts, luggage, and more.
Earthfriendly high density polyethylene hdpe is a durable polyolefin, resistant to most solvents and temperature variation. Hdpe forms the largest product family in polyethylene, and is used in numerous customer applications such as pipe, plastic fuel tanks, industrial packagings, bottles, healthcare articles, containers, toys. Hdpe polythene plastic sheet highdensity polyethylene plastic sheet has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. Hdpe plastics hdpe materials high density polyethylene. Its heat resistance is the lowest in the family with a maximum service temperature of 160 degrees to 180 degrees fahrenheit. Stress cracking sc is an external or internal cracking in plastic induced by tensile stress. Our specially extruded liners combine high tensile strength and chemical resistance with excellent stress. Hdpe has very good stress crack resistance as well as high impact and melt strength. Highdensity polyethylene hdpe resins are well suited for a range of extrusion film applications such as grocery, garbage and deepfreezer bags 10 to 25 microns and injection, blown and rotational molding processes. High stress crack resistance moisture resistance hdpe wear and abrasion resistant stress crack. Hdpe has a high crystallinity and therefore an excellent resistance to a wide ra nge of chemicals. Environmental stress cracking in polyethylene takes place because of interlamellar failure, which in turn is caused by relaxation of tie molecules.
Environmental stress crack resistance of hdpe abg geosynthetics. Environmental stress cracking is a physical phenomenon that is initiated as a slow surface crack. Seiler plastics polypropylene plastic sheet material. Hdpe is the abbreviation of high density polyethylene and it is an excellent engineering plastic. According to astm d 883, stress crack is defined as an external or internal crack in a plastic caused by tensile stresses less than its shorttime mechanical strength. One of the fastest growing plastics today is linear lowdensity polyethylene lldpe, used mainly in film applications but also suitable for injection, rotational and blow molding. Our high density polyethylene material offers an exceptional durability. Both ldpe and hdpe sheet can be heat formed, shaped and welded to. Environmental stress cracking esc is one of the most common causes of unexpected brittle failure of thermoplastic especially amorphous polymers known at present.
Polyvinyl chloride pvc this pvc sheet has excellent corrosion resistance and weather resistance. However, that is not a really practical proposition in many. Aug 01, 2008 get a handle on stresscracking in hdpe bottles one of the first applications for blow molded hdpe bottles was the replacement of glass for bleach packaging. Other features and benefits of polypropylene sheeting include. Environmental stress crack resistance of polyethylene ineos. Hdpe sheet plastic sheet, plastic rod, plastic tubing. A slightly less crystalline hdpe will have better crack resistance, and density is a direct measure of crystallinity. Hdpe possesses excellent impact strength and stress crack resistance in addition to chemical and corrosion.
Effects of recycled hdpe and nanoclay on stress cracking of. Hdpe has a high crystallinity and therefore an excellent resistance to a wide range of chemicals. High density, hdpe, is produced by packing molecules more closely together. It is ideally suited for the manufacture of chemical resistant products and products which come in direct contact with foodstuffs. High stress crack resistance moisture resistance hdpe wear and abrasion resistant stress crack resistant high tensile strength impervious to most chemicals excellent energy absorption. Sheet goods 4 x 8 plastic sheets sheet pile plastic. Esc and polymer resistance to esc escr have been studied for several. Escr environmental stress crack resistance of hdpe. Hdpe hdpp highdensity polyethylene and highdensity polypropylene is also nontoxic and nonstaining. Hdpe plastic sheet 4x8 plastic pe sheet high density polyethylene sheet. High density polyethylene 40 mil hdpe liner geomembrane.
These hdpe resins can be used in blowmolded bottles for everything from milk and pharmaceuticals to automotive fluids and agricultural chemicals. Hdpe forms the largest product family in polyethylene, and is used in. Natural color is milky white, semitranslucent depending on density. According to astm d 883, stress crack is defined as an external or internal crack in a plastic caused by tensile stresses less than. Environmental stress cracking esc in plastics means the failure at about. Stress cracking agents, such as the liquids mentioned above, migrate into. The bent strip test is a constant strain test, but. Environmental stress crack resistance of polyethylene. Our polyethylene is ideal for your applications polyprime. I need information on any laboratoryorganisation conducting these type of testings. The specimens are bent and inserted into a c shaped bracket, creating a stress in the. Pvc containers offer clarity, durability and chemical resistance. This communication aims to link the influence of the hdpe polymer used within.
According to astm d883, stress cracking is defined as an external or internal crack in a plastic caused. Superior corrosion resistance high stress crack resistance moisture resistance hdpe wear and abrasion resistant stress crack resistant high tensile strength impervious to most chemicals excellent energy absorption. Establishing 100year service life for hdpe drainage pipe michael pluimer technical and engineering manager, plastics pipe institute. For high density polyethylene xray scattering data indicate that the. Hitec is a high impact, high density polyethylene sheet. Polypropylene sheet provides good impact resistance, considerable thermal resistance, and excellent chemical resistance. D 5397, standard test method for evaluation of stress crack resistance of polyolefins using notched constant tensile load test. Hdpe has greater stiffness, rigidity, heat resistance, and increased resistance to permeability than ldpe. Food grade material fda, food grade material is available upon request. It is ideally suited for the manufacture of chemical resistant products and products which come in direct contact with. Hdpe cutting boards are compliant to fda, usda, and nsf requirements. Environmental stress crack resistance service temperatures up to 60c 140f is highly resistant to a wide variety of rather reactive cracking of escr is carried out on molded specimens 18 in. Environmental stress crack resistance of polyethylene today, this test is specified less frequently because it is not as aggressive towards modern resins.
Hdpe plastic sheets has a variety of properties and is a thermoplastic resin. Some copolymers of ldpe are available with improved stresscrack resistance. It is well known from the pipe and cable insulation industries that pe can stress crack over long periods of time. After the addition of carbon black required for uv resistance the density of the manufactured polyethylene sheet is 940 kgm3. Our polyethylene pe sheet and roll stock is a highly versatile material that can be used for a large number of converted products. The 100year stress crack resistance scr of corrugated hdpe pipes was evaluated using a 600 mm diameter pipe. One such performance criteria is environmental stress crack resistance. Environmental stress crack resistance of polyethylene ten rectangularshaped specimens are cut from a molded plaque prepared with standard methods. Gps hd 40 mil is a smooth, high quality, high density polyethylene hdpe geomembrane produced from. It has outstanding chemical resistance, mechanical properties, environmental stress crack resistance, dimensional stability and thermal aging characteristics thus its known for its strength to density ration. Nevertheless, uhmwpe can be processed by compression sintering into sheet, block, and.
Preform iv is sometimes, but not often, the main culprit. High density polyethylene hdpe sheets a member of the polyolefin family, polyethylene hdpe is recognized as being extremely environmentallyfriendly. Uv ultraviolet stabilized resistant polyethylene hdpe. Environmental stress crack resistance lyondellbasell. The stress crack resistance of hdpe geomembrane sheet. A controlled notch is cut horizontally across each specimen, which serves as a crack initiation point. One of the fastest growing plastics today is linear lowdensity polyethylene lldpe, used mainly in film applications but. Properties of lldpe are different from those of conventional ldpe and hdpe. Hdpe corrugated pipe service life corrugated stress crack. Impact and environmental stress crack resistance escr. Sc is a crack in a plastic caused by tensile stresses less than its. This stress relaxation allows testing to run without failure for very long periods 1,500 hours. Hdpe sheets stress relieved sr these sheets have gone through an additional annealing process to reduce stress. Aug 01, 2007 poor stress crack resistance always comes from degraded preform iv.
932 1479 1137 648 80 1464 1151 219 1294 916 810 1388 730 993 518 512 942 1360 505 1135 1011 461 734 1166 677 1177 1114 1383 730 966