Plastic POM/Acetal

Plastic POM/Acetal (Delrin) strength, stiffness, density and thermal properties, with their source.

A bracket in Plastic POM/Acetal, smooth finish.

Mechanical
Yield strength	69MPa1
Ultimate tensile strength	69MPa1
Compressive strength	124MPa1
Flexural strength	99MPa1
Elongation at break	75%1
Young's modulus (stiffness)	2.8GPa1
Density	1,420kg/m³2
Strength to weight	48.6kN·m/kg
Stiffness to weight	1.97MN·m/kg
Poisson's ratio	0.351
Shear modulus	1.04GPa
Bulk modulus	3.11GPa
Speed of sound	1,404m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal
Thermal conductivity	0.4W/m·K1
Thermal expansion	mean122µm/m·K1
100 mm part over a 50 °C swing	610µm growth
Specific heat	average -18 to 100 °C1,465J/kg·K1
Heats up and cools (diffusivity)	0.192mm²/s
Thermal shock resistance	52.5W/m
Melting point	175°C1
Max service temperature	HDT 1.8 MPa125°C1

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: DuPont

Values for: Bulk polymer (molded or machined). DuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.com

1
Delrin Acetal Resin Design Guide, Module IIIDuPontarchived copyYield strength: typical (single ASTM D638 tensile strength)Ultimate tensile strength: typicalCompressive strength: compressive stress at 10% deformationFlexural strength: flexural yield strength, typicalElongation at break: typicalYoung's modulus (stiffness): typicalPoisson's ratio: typicalThermal conductivity: typicalThermal expansion: mean, 29 to 60 °CSpecific heat: average -18 to 100 °C, Delrin acetal resins (not grade-specific)Melting point: crystalline melting pointMax service temperature: HDT 1.8 MPa (annealed)
2
Delrin 100 Product Data SheetDuPontDensity: typical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties')

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Thermal properties of Plastic POM/Acetal

Thermal conductivity of Plastic POM/Acetal

Plastic POM/Acetal has a thermal conductivity of 0.4 W/m·K (0.231 BTU/hr·ft·°F). Basis: typical. Source: DuPont, Delrin Acetal Resin Design Guide, Module IIIarchived copy.

Specific heat of Plastic POM/Acetal

The specific heat capacity of Plastic POM/Acetal is 1,465 J/kg·K (0.35 BTU/lb·°F). Basis: average -18 to 100 °C, Delrin acetal resins (not grade-specific). Source: DuPont, Delrin Acetal Resin Design Guide, Module IIIarchived copy.

Coefficient of thermal expansion of Plastic POM/Acetal

Plastic POM/Acetal expands 122 µm/m·K (67.8 µin/in·°F): a 100 mm part grows 610 µm over a 50 °C rise. Basis: mean, 29 to 60 °C. Source: DuPont, Delrin Acetal Resin Design Guide, Module IIIarchived copy.

Thermal diffusivity of Plastic POM/Acetal

Computed from the conductivity, density and specific heat (k / ρc): 0.192 mm²/s, how fast a temperature change spreads through it.

Melting point of Plastic POM/Acetal

Plastic POM/Acetal melts at 175 °C (347 °F). Basis: crystalline melting point. Source: DuPont, Delrin Acetal Resin Design Guide, Module IIIarchived copy.

Maximum service temperature of Plastic POM/Acetal

The maximum service temperature of Plastic POM/Acetal is 125 °C (257 °F). Basis: HDT 1.8 MPa (annealed). Source: DuPont, Delrin Acetal Resin Design Guide, Module IIIarchived copy.