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Polyethylene is classified into several different categories based mostly on its density and branching. These both determine its properties.  Ultra-high-molecular-weight.

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Presentation on theme: "Polyethylene is classified into several different categories based mostly on its density and branching. These both determine its properties.  Ultra-high-molecular-weight."— Presentation transcript:

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2 Polyethylene is classified into several different categories based mostly on its density and branching. These both determine its properties.  Ultra-high-molecular-weight polyethylene (UHMWPE) Ultra-high-molecular-weight polyethylene  Ultra-low-molecular-weight polyethylene (ULMWPE or PE-WAX)  High-molecular-weight polyethylene (HMWPE)  High-density polyethylene (HDPE) High-density polyethylene  High-density cross-linked polyethylene (HDXLPE)  Cross-linked polyethylene (PEX or XLPE)  Medium-density polyethylene (MDPE)  Linear low-density polyethylene (LLDPE)  Low-density polyethylene (LDPE) Low-density polyethylene  Very-low-density polyethylene (VLDPE)  Chlorinated polyethylene (CPE)

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4 ● LDPE(Low Density Polyethylene) ▪ Branching▪ Branching (weaker) ▪ Lower tensile strength (deforms easily)tensile strength ▪ Higher ductility (doesn’t break easily)ductility ▪ Molecules are less tightly packed ▪ Cheapest/easiest to make ▪ Application wash bottles Saran & Glad wrap most common = dry-cleaning bags

5 ● HDPE(High Density Polyethylene) ▪ Linear▪ Linear - (stronger) ▪ More tensile strength (doesn’t deform easily)tensile strength ▪ Lower ductility (breaks easily)ductility ▪ More expensive to make ▪ Application Sandwich bags Laundry detergent bottles Grocery bags Pipe

6 ● UHMWPE(Ultra High Molecular Weight Polyethylene) ▪ Extremely long chains  Linear  Very packed  Tough material ▪ Application  Highest impact strength  bulletproof vests  orthopedic implants (artificial hips, knees)  “ice-less” skating rinks

7 PE pipe or fittings are joined to each other by Heat fusion. The principle of heat fusion is to heat two surfaces to a designated temperature, then fuse them together by application of a sufficient force. This force causes the melted materials to flow and mix, thereby resulting in fusion. When fused according to the pipe and/or fitting Manufacturers’ procedures, the joint area becomes as strong as, or stronger than, the pipe itself in both tensile and pressure properties and properly fused joints are absolutely leak proof.

8  Butt Fusion · Most widely used method for joining individual lengths · Permanent, economical and flow-efficient connection

9  Saddle/Conventional Fusion · surface of the “saddle” type fitting with concave and convex shaped heating tools

10  Socket Fusion ·Simultaneously heating both surface


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