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HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] 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 (38 MPa versus 21 MPa) than LDPE. [6]
HDPE pipe is a type of flexible plastic pipe used to transfer fluids and gases. It is often employed for replacing aging concrete or steel main pipelines . Constructed from the thermoplastic HDPE (high-density polyethylene ), it has low permeability and robust molecular bonding, making it suitable for high-pressure pipelines .
Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.
Ultra-high-molecular-weight polyethylene (UHMWPE, UHMW) is a subset of the thermoplastic polyethylene.Also known as high-modulus polyethylene (HMPE), it has extremely long chains, with a molecular mass usually between 3.5 and 7.5 million amu. [1]
This list is based on the Forbes Global 2000, which ranks the world's 2,000 largest publicly traded companies.The Forbes list takes into account a multitude of factors, including the revenue, net profit, total assets and market value of each company; each factor is given a weighted rank in terms of importance when considering the overall ranking.
Stone "paper" consists of roughly 80% calcium carbonate, 18% HDPE and 2% proprietary coating. [3] It has a density range of 1.0–1.6 g/cm 3 (0.58–0.92 oz/cu in), which is equal to or slightly higher than that of ordinary paper, and a texture somewhat like that of the outer membrane of a boiled egg.
The company was founded in 1955 as "Alpenplastik Lehner Alwin OHG" by the brothers Alwin (1932-2018) and Helmuth Lehner (1930-1978). After starting with the injection moulding production of plastic cups, ALPLA produced plastic bottles for the first time in 1958.
Intertape Polymer Group Inc. is a packaging products and systems company based in Montreal and Sarasota, Florida, with 34 locations, [1] 22 manufacturing locations in North America [1] and one in Europe, and 4,200 employees.