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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).
The melting point of α-crystalline regions is given as 185 [15] [16] to 220 °C, [15] [17] the density as 0.936 to 0.946 g·cm −3. [18] [19] The β-modification is in comparison somewhat less ordered, as a result of which it forms faster [20] [21] and has a lower melting point of 170 to 200 °C.
Toggle the table of contents. Melting points of the elements (data page) ... melting point 302.9146 K (29.7646 °C) fixed point on ITS-90: 32 Ge germanium; use:
Toggle the table of contents. ... Melting point: 100 °C (212 °F) to 260 °C ... It is also used in making plastic bottles, packaging, and bank or membership cards. ...
However, some plastics are partially amorphous and partially crystalline in molecular structure, giving them both a melting point and one or more glass transitions (the temperature above which the extent of localized molecular flexibility is substantially increased).
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]
Melting points of the elements (data page) — Melting point; Oxidation states of the elements — Oxidation state; Speeds of sound of the elements (data page) — Speed of sound; Thermal conductivities of the elements (data page) — Thermal conductivity; Thermal expansion coefficients of the elements (data page) — Thermal expansion
Toggle the table of contents. ... Most commercial plastics are synthetic polymers derived from petrochemicals. ... Melting point 175 °C., and glass transition ...