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--- everplast:plastic_materials:hdpe [2019/08/13 05:46] – removed jonathan_tsai
+++ everplast:plastic_materials:hdpe [2019/09/28 00:52] (current) – [Reference URL] jonathan_tsai
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+====== HDPE ======
+High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a thermoplastic polymer produced from the monomer ethylene. It is sometimes called "alkathene" or "polythene" when used for HDPE pipes. With a high strength-to-density ratio, HDPE is used in the production of plastic bottles, corrosion-resistant piping, geomembranes and plastic lumber. HDPE is commonly recycled, and has the number "2" as its resin identification code.
+===== Properties =====
+HDPE is known for its high strength-to-density ratio. The density of HDPE can range from 930 to 970 kg/m³. Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength than LDPE. The difference in strength exceeds the difference in density, giving HDPE a higher specific strength. It is also harder and more opaque and can withstand somewhat higher temperatures (120 °C/248 °F for short periods). High-density polyethylene, unlike polypropylene, cannot withstand normally required autoclaving conditions. The lack of branching is ensured by an appropriate choice of catalyst (e.g., Ziegler–Natta catalysts) and reaction conditions.
+The physical properties of HDPE can vary depending on the molding process that is used to manufacture a specific sample; to some degree a determining factor are the international standardized testing methods employed to identify these properties for a specific process. For example, in Rotational Molding, to identify the environmental stress crack resistance of a sample, the Notched Constant Tensile Load Test (NCTL) is put to use.
+Owing to these desirable properties, pipes constructed out of HDPE are ideally applicable for potable water, and waste water (storm and sewage).
+===== Reference URL =====
+  * https://en.wikipedia.org/wiki/High-density_polyethylene
+  * [[https://www.everplast.com.tw/hdpe-pipe-extrusion-line-2/|HDPE Pipe Extrusion Line]]
+  * [[https://www.everplast.com.tw/hdpe-screen-net-extrusion-line/|HDPE Screen Net Extrusion Line]]
+  * [[https://www.everplast.com.tw/800mm-hdpe-pipe-extrusion-line/|800mm HDPE Pipe Extrusion Line]]
+  * [[https://www.everplast.com.tw/350mm-hdpe-pipe-extrusion-line/|350mm HDPE Pipe Extrusion Line]]
+  * [[https://www.everplast.com.tw/hdpe-pipe-extrusion-line/|HDPE Pipe Extrusion Line]]
+  * [[https://www.everplast.com.tw/pe-pipe-line-for-electrical-cable-application/|PE Pipe Line for Electrical Cable Application
+]]