It is manufactured at low temperature (70-300°C) and pressure (10-80 bar) & derived from either: High Density Polyethylene Molecular Structure.
The most common processing technique used for Low Density Polyethylene is extrusion (tubes, blow and cast films, cables...). 5. Around 80% of LDPE is used for the production of films, mainly packaging films, as well as cable insulation and extrusion when producing cardboard coatings and other materials. For common commercial grades of high-density polyethylene the melting point is typically in the range 120 to 130 °C (248 to 266 °F). Drying is not necessary if stored properly, High mold temperature will improve brilliance and appearance of the part, Mold shrinkage lies between 1.5 and 3%, depending on processing conditions, rheology of the polymer and thickness of the final piece, Post mold shrinkage lies between 1.5 and 3.5%, Material Injection Pressure: Up to 150 MPa, Pre-Drying: No, 3 hours at 105-110 C (221-230°F) for regrind, Higher melt temperatures are needed for extrusion-coating (280-310°C), A three zone screw with an L/D ratio of around 25 is recommended. But, what is polyethylene? However, weathering resistance of HDPE can be improved by the addition of carbon black or UV absorbing additives. It is one of the most widely produced plastics in the world (tens of millions of tons are produced worldwide each year). UHMWPE is processed variously by compression moulding, ram extrusion, gel spinning, and sintering. In addition to main polyethylene types (LDPE, HDPE), medium-density polyethylene (MDPE), cross-linked polyethylene (PE-X) and ultra-high-molecular-weight polyethylene (UHMWPE) are also used for industrial purposes. It is insoluble at room temperature and does not swell in any known solvents. They can be processed by common forming techniques such as injection molding, blow molding, extrusion and thermoforming, using standard thermoplastic equipment. LDPE has a melting point of 105°C. Box 490 Eagle, Wisconsin 53119, © 2020 Plastic Molded Concepts, Inc. Polyethylene is a lightweight, durable thermoplastic with variable crystalline structure. The most common types of polyethylene are: High Density Polyethylene (HDPE) is a cost-effective thermoplastic with linear structure and no or low degree of branching. Density of LDPE: 0.910–0.940 g/cm3 3. Low Density Polyethylene can be processed by injection molding or rotomolding also. The two most important polyolefins are polyethylene (PE) and polypropylene (PP). High density polyethylene is flexible, translucent/waxy, weather resistant, and displays toughness at very low temperatures. Low cost polymer with good processability 6. They are polymers of simple alkenes such as ethylene, propylene, butenes, and pentenes, and copolymers thereof. It is produced at high pressure (1000-3000 bar; 80-300°C) via free radical polymerization process. To avoid improper resin selection, Contact PMC for additional help in determining the exact engineering resin required for your application. The material is almost totally inert, therefore it is used in the most corrosive or aggressive environments at moderate temperatures. » Learn More About HDPE Properties and Related Values in Detail. Linear low-density polyethylene (LLDPE) has a melting point of 122°C. Ultrahigh-Molecular-Weight Polyethylene (UHMWPE), High-density crosslinked polyethylene, or XLPE, is a form of, Comparison Between Main Types of Polyethylene, Get Detailed Information on Several Other Properties of LDPE, LLDPE and HDPE. LLDPE is produced by polymerization of ethylene (or ethane monomer) with 1-butene and smaller amounts of 1-hexene and 1-octene, using Ziegler-Natta or metallocene catalysts. Applications of High Density Polyethylene (HDPE).

Polyethylene is used in applications ranging for films, tubes, plastic parts, laminates, etc. For which requirements is it a material of choice? » See All Food Contact-approved LDPE Grades. LDPE Melting point: 105 to 115°C 2. in several markets (packaging, automotive, electrical, etc.). They are physiologically harmless, No odor pollution or wastewater are produced in the manufacture of PE films. This limits its usage in applications requiring extreme temperatures. Applications of Low Density Polyethylene (LDPE). Polyethylene is processed using all known plastics processing methods - extrusion, extrusion blowing, injection molding, pneumatic molding and rotational molding. Resin Identification Code for two main forms of polyethylenes are: LDPE and HDPE are non-biodegradable in nature and contribute significantly to the world’s plastic waste products. We only use the, 66 PSI (Unannealed) 107 – 185 F; 264 PSI (Unannealed) 93.2 – 160 F, Thin Sections Possible without Losing Strength.

High impact strength at low temperature, good weatherability 7. The most popular application of low density polyethylene is plastic bags. Temperature resistance up to 80°C continuously and 95°C for shorter times. ), blow molding and rotomolding. Various forms of Polyethylene can be used in processes like injection molding, blow molding, extrusion and various film creation processes such as calendaring or blown film extrusion. Carbon black also helps to reinforce the material. » Check Out All Commercially Available HDPE Grades for Packaging. The sheer availability of PE is encouraging efforts to apply this material for additive manufacturing. What it is made up of? Compared to HDPE, it has a higher degree of short and long side-chain branching. Low strength, stiffness and maximum service temperature. From plastic containers, bottles, bags to plastic toys; everywhere we look, we see most of the plastic items made of polyethylene! UHMWPE is suitable for high wear applications such as tubes, liners, silos, containers and other equipments.

Temperature resistance up to 80°C continuously and 95°C for shorter times. A useful attribute of thermoplastics is that they can be heated to their melting point, cooled, and reheated again without significant degradation.

It conventional methods such as injection, blow or extrusion molding, because this material does not flow even at temperatures above its melting point. Both the forms of polyethylene are recyclable and used to produce bottles for non-food items, plastics for outdoor applications, compost bins, etc.

(Chemical formula of Ethene - C. PE belongs to polyolefin family of polymers and is classified by its density and branching.

High Density Polyethylene Chemical resistance: Very good resistance to alcohols, dilute acids and alkalis, Poor resistance to hydrocarbons (aliphatic, aromatic, halogenated), Continuous temperature: -50°C to +60°C, Relatively stiff material with useful temperature capabilities, Higher tensile strength compared to other forms of polyethylene, Low cost polymer with good processability, Excellent electrical insulating properties, High-frequency welding and joining impossible, Good resistance to alcohols, dilute alkalis and acids, Limited resistance to aliphatic and aromatic hydrocarbons, mineral oils, oxidizing agents and halogenated hydrocarbons. There are no toxic fumes or gases and no cinders produced in this process, PE films contain no plasticizers and no heavy metals. PE is not available for 3D Printing processes because it is more difficult to work with it. Applications of LLDPE: Suitable for a variety of film application such as general purpose film, stretch film, garment packaging, agricultural film, etc. It is water-resistant, not reactive in contact with alkali, salt solutions, organic and inorganic acids. Ultra-high-molecular-weight polyethylene (UHMWPE), High Degree of short chain branching + long chain branching, Linear (or Low degree of short chain branching), Using radical polymerization using tubular method or auto clave method, Using Ziegler-Natta catalyst or metallocene catalyst, Low crystalline and high amorphous (less than 50-60% crystalline), High crystalline and low amorphous (>90% crystalline), Shrink wrap, films, squeezable bottles garbage bags, extrusion moldings, and laminates, High performance bags, cushioning films, tire separator films, industrial liners, elastic films, ice bags, bags for supplemental packaging and garbage bags, High-molecular-weight polyethylene (HMWPE), Ultra-low-molecular-weight polyethylene (ULMWPE), Modifying natural gas (a methane, ethane, propane mix) or, The catalytic cracking of crude oil into gasoline. The melting point for average, commercial, l ow density polyethylene is typically 105 to 115 °C (221 to 239 °F). It can be engineered according to the end use requirements.

Polyolefins, also called polyalkenes, are the largest class of commodity thermoplastics.
Density 0.910-0.950 g/cm3 pH (Value) Not Applicable Vapour Pressure (Pascal) Not Applicable Percent Volatile by volume (%) <0.1 Easily Avoid Disruptions in Your Injection Molding or Extrusion Production Line. 1. It has excellent mechanical properties such as high abrasion resistance, impact strength and low coefficient of friction.

We only use the material list to inform visitors that we are experienced in processing  these materials for many fine products. PE, polyurethanes and PVC are widely used thermoplastics for agricultural pipes, tubing, hose pipes and for creating custom pipe solutions. How to process PE?

Limited resistance to aliphatic and aromatic hydrocarbons, mineral oils, oxidizing agents and halogenated hydrocarbons 4. Low Density Polyethylene (LDPE) is a semi-rigid and translucent polymer. High gas permeability, particularly carbon dioxide, Excellent for mild and strong buffers, good chemical resistance, Good water vapor and alcohol barrier properties, PE films burn to carbon dioxide and water with no residue. Being and ideal material for injection molding process, it is majorly used for batch and continuous production. Plastic Molded Concepts, Inc. P.O. Good resistance to alcohols, dilute alkalis and acids 2. Advantages: high softening temperature (which allows to use it for hot products packaging), excellent performance characteristics at low and high temperatures, surface gloss and crack-resistance. High density polyethylene can be easily processed by injection molding, extrusion (tubes, blow and cast films, cables, etc. High electrical and insulation properties, Excellent resistance to acids, bases and vegetable oils, Molecular weight distribution is relatively narrow, has applications in injection moldings or flat yarns, and the latter type, Molecular weight distribution is wide, is used to make film products, hollow plastic products and pipes. LLDPE resin is commonly used in applications such as, plastic films, bags, stretch wrap, covers, lids, toys and cable insulation. It is structurally similar to LDPE. These special properties allow the product to be used in several high performance applications. Chemical resistance of LDPE: 1. Excellent combination of properties makes HDPE an ideal material in diverse applications across industries. Please Note: PMC does not sell the material listed below. But now, recycled and green PE are gaining popularity for processing by 3D Printing.

High impact strength at low temperature, good weatherability. Thermoplastic materials become liquid at their melting point (110-130 degrees Celsius in the case of LDPE and HDPE respectively). Melting point/Melting range 115-135°C Boiling Point (oC) Not Applicable Flash point > 300oC Auto Ignition temperature > 300°C Decomposition temperature > 300°C Danger of explosion Product is not explosive. Although no plastic tubing product can universally handle all applications, and there are certain differences that need to be considered per application area.


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