High – Density Polyethylene Low – Density Polyethylene 1. There are many variations in the branching, density, molecular weight, and crystallinity. It can be used in difficult and aggressive environments. Did you have cereal for breakfast? If you aren’t aware of the different types of can liners available on the market, then chances are you might be. The High-density Polyethylene (HDPE) and Low-density Polyethylene (LDPE) have different mechanical properties such as the crystal structure, the magnitude and nature of branching and the molecular weight. With a low tensile strength, LDPE is used in products like plastic bags and film wrap as well as packagings such as water bottles, food storage containers, dispensing bottles and plastic tubs. by Heather Mahr . This results in a plastic that is softer and more flexible, but which also has lower tensile strength. In appearance, polyethylene looks similar to a strand of spaghetti, something like this: However, its variant known as High Density Polyethylene (HDPE) has a low amount of branching. These monomers are joined together. HDPE is a cost-effective and tough thermoplastic. Due to HDPE’s robustness and chemical resistance, it is also used to make pipes. It has good electrical and insulation properties and is hence used to make insulation for high-voltage cables. While there are many types of PE, two most-common ones are low-density polyethylene (LDPE) and high-density polyethylene (HDPE). July 24, 2011 < http://www.differencebetween.net/language/words-language/difference-between-pp-and-hdpe/ >. High-Density Polyethylene (HDPE) 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) Very-Low-Density Polyethylene (VLDPE) Chlorinated Polyethylene (CPE) Key Differences. Celebrating the Differences (and Similarities) of LDPE and HDPE, Medical Device and Pharmaceutical Testing. LDPE comes as both opaque and translucent. LDPE’s structure is not crystalline. HDPE: HDPE is chemically inert, and resistant ultraviolet rays compare to LDPE. HDPE is recycled under the resin identification code ‘2’. Polymerization is done either in suspension, gas, or solution-phase reactors. One day of lead time is required for this project. It is also FDA compliant, which makes it useful in the area of food packaging. The polymer chains of LDPE are highly branched compared to HDPE. As a result, irregular packing and low crystallinity can be observed (Figure 1). The density of HDPE is actually only slightly higher than that of LDPE. Some techniques like injection-stretch and blow molding are also used. It actually has a higher strength to density ratio when compared to LDPE. Nimisha Kaushik. Kits are passed out to the students and they investigate the strength and flexibility of the samples. It usually comes in plastic bottles, piping and other corrosion resistant material. This is due to the formation of carboxylic acids and aldehydes. It contains less than 1 side chain per 2-4 carbon atoms in the main carbon skeleton leading to branching. 3. 4.The melting range of PP is 160-166 degrees Celsius; HDPE can withstand temperatures as high as 120 degrees Celsius. Yashoda has been a freelance writer in the field of biology for about four years. That exceptional “formability” makes LDPE particularly useful for a range of applications, from rigid products like plastic bottles, buckets and bowls to filmy ones like plastic grocery bags and plastic cling-wrap. and It is also used to make transparent films and food packaging material. The specific gravity is lower than that of HDPE. HDPE is manufactured by polymerization and comonomers are added to reduce branching. I love diving into the latest and greatest in emerging technologies and seeing what they can do. The custom demos section of the website is used by UO chemistry instructors to schedule demonstrations that are not listed in the database. For instance, High density of the same thickness will be stronger, more puncture resistant, more tear resistant, tougher, stiffer, more chemical resistant, than a low density polyethylene made from the same grade of polyethylene. In conclusion, HDPE and LDPE are different grades of polyethylene and the key difference between them is the alignment of the polymer molecules. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. It is different from HDPE in that it has more branching than HDPE.

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