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Published byPaxton Stonehouse Modified over 10 years ago
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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 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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● 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
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● 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
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● 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
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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.
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Butt Fusion · Most widely used method for joining individual lengths · Permanent, economical and flow-efficient connection
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Saddle/Conventional Fusion · surface of the “saddle” type fitting with concave and convex shaped heating tools
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Socket Fusion ·Simultaneously heating both surface
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