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Thermophysical properties of high density polyethylene (HDPE) [3] Density 961 kg/m 3: Melting point 131.8 °C (269.24 °F) Temperature of crystallization 121.9 °C (251.42 °F) Latent heat of fusion 188.6 kJ/kg. Thermal conductivity: 0.54 W/m.°C. at °C. Specific heat capacity 1331 to 2400 J/kg-K Specific heat (solid) 2.9 kJ/kg. °C ...
The melting point for average commercial low-density polyethylene is typically 105 to 115 °C (221 to 239 °F). These temperatures vary strongly with the type of polyethylene, but the theoretical upper limit of melting of polyethylene is reported to be 144 to 146 °C (291 to 295 °F). Combustion typically occurs above 349 °C (660 °F).
To make lengths of HDPE pipe, polyethylene raw material is dried, heated to ~180 °C (356 °F), and extruded through a die. Polyethylene pipe is usually black due to the addition of 3-5% of carbon black to the clear polyethylene material, which adds UV light resistance to the finished pipe. To create striped HDPE pipe a different die is used ...
High-density polyethylene: 70–80: 1.0: 0.85 Low-density polyethylene: ... or in samples stored for long time at temperatures just under the melting point. The ...
Its melting point is around 130 to 136 °C (266 to 277 °F), [8] and, according to DSM, it is not advisable to use UHMWPE fibres at temperatures exceeding 80 to 100 °C (176 to 212 °F) for long periods of time. It becomes brittle at temperatures below −150 °C (−240 °F). [9]
Interest in the material in the 1950s arose from its high melting point and tensile strength, making it more desirable than the more common form of polyethylene. For example, the medical community in 1958 was eager to use Marlex 50 crystalline polyethylene which softens at 260 °F (127 °C).
MFI Measuring device. The Melt Flow Index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer.It is defined as the mass of polymer, in grams, flowing in ten minutes through a capillary of a specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for alternative prescribed temperatures.
Medium-density polyethylene (MDPE) is a type of polyethylene defined by a density range of 0.926–0.940 g/cm 3. [1] It is less dense than HDPE, which is more common. MDPE can be produced by chromium/silica catalysts, Ziegler-Natta catalysts or metallocene catalysts. MDPE has good shock and drop resistance properties.