Plastic HDPE

Plastic HDPE strength, stiffness, density and thermal properties, with their source.

A bracket in Plastic HDPE, smooth finish.

Mechanical
Yield strength	24MPa1
Elongation at break	not sourced
Young's modulus (stiffness)	0.9GPa1
Density	950kg/m³1
Strength to weight	25.3kN·m/kg
Stiffness to weight	0.947MN·m/kg
Poisson's ratio	base material0.4–0.452
Shear modulus	0.316GPa
Bulk modulus	2GPa
Speed of sound	973m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal
Thermal conductivity	base material0.4–0.49W/m·K2
Thermal expansion	base material120µm/m·K2
100 mm part over a 50 °C swing	600µm growth
Specific heat	base material2,250J/kg·K2
Heats up and cools (diffusivity)	0.208mm²/s
Thermal shock resistance	56.9W/m

Thermal conductivity against densityHigher and further left: spreads more heat for its weight

Thermal expansion against thermal conductivityLower and further right: warps less when heated

Sources2 documents: LyondellBasell, INEOS Olefins & Polymers USA

Values for: Bulk polymer (molded or machined). LyondellBasell Hostalen 23050 B high density polyethylene, typical ISO values

1
Hostalen 23050 B Product DataLyondellBasellYield strength: typical, tensile stress at yield 23 °C, 50 mm/min ISO 527Young's modulus (stiffness): typical, tensile modulus 23 °C ISO 527Density: typical, ISO 1183
2
Typical Engineering Properties of High Density PolyethyleneINEOS Olefins & Polymers USAarchived copyPoisson's ratio: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)Thermal conductivity: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)Thermal expansion: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)Specific heat: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)

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Thermal properties of Plastic HDPE

Thermal conductivity of Plastic HDPE

Plastic HDPE has a thermal conductivity of 0.4–0.49 W/m·K (0.231–0.283 BTU/hr·ft·°F). Basis: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE). Source: INEOS Olefins & Polymers USA, Typical Engineering Properties of High Density Polyethylenearchived copy.

Specific heat of Plastic HDPE

The specific heat capacity of Plastic HDPE is 2,250 J/kg·K (0.537 BTU/lb·°F). Basis: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE). Source: INEOS Olefins & Polymers USA, Typical Engineering Properties of High Density Polyethylenearchived copy.

Coefficient of thermal expansion of Plastic HDPE

Plastic HDPE expands 120 µm/m·K (66.7 µin/in·°F): a 100 mm part grows 600 µm over a 50 °C rise. Basis: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE). Source: INEOS Olefins & Polymers USA, Typical Engineering Properties of High Density Polyethylenearchived copy.

Thermal diffusivity of Plastic HDPE

Computed from the conductivity, density and specific heat (k / ρc): 0.208 mm²/s, how fast a temperature change spreads through it.

Plastic HDPE

Thermal properties of Plastic HDPE

Thermal conductivity of Plastic HDPE

Specific heat of Plastic HDPE

Coefficient of thermal expansion of Plastic HDPE

Thermal diffusivity of Plastic HDPE

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