Plastic Nylon PA66

Plastic Nylon PA66 (dry) strength, stiffness, density and thermal properties, with their source.

A bracket in Plastic Nylon PA66, smooth finish.

Mechanical
Yield strength	85MPa1
Elongation at break	30%1
Young's modulus (stiffness)	3GPa1
Density	1,130kg/m³1
Strength to weight	75.2kN·m/kg
Stiffness to weight	2.65MN·m/kg
Poisson's ratio	base material0.42
Shear modulus	1.07GPa
Bulk modulus	5GPa
Speed of sound	1,629m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal
Thermal conductivity	0.33W/m·K1
Thermal expansion	longitudinal98µm/m·K1
100 mm part over a 50 °C swing	490µm growth
Specific heat	1,700J/kg·K1
Heats up and cools (diffusivity)	0.172mm²/s
Thermal shock resistance	57.2W/m
Melting point	DSC260°C1
Max service temperature	101°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: BASF, Covestro

Values for: Bulk polymer (molded or machined). BASF Ultramid A3K (PA66, unreinforced injection-moulding grade), Product Information 02/2026, dry values (ISO methods)

1
Ultramid A3K Product InformationBASFYield strength: typical, dryElongation at break: nominal strain at break, dryYoung's modulus (stiffness): typical, dryDensity: typicalThermal conductivity: typicalThermal expansion: longitudinal, 23-55 °CSpecific heat: typicalMelting point: DSCMax service temperature: IEC 60216 temperature index, 20000 h
2
Engineering Polymers Part and Mold Design: Thermoplastics, A Design GuideCovestroPoisson's ratio: base material: unfilled polyamide (PA), conditioned, maker design-guide family value (Covestro Table 3-1)

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Thermal properties of Plastic Nylon PA66

Thermal conductivity of Plastic Nylon PA66

Plastic Nylon PA66 has a thermal conductivity of 0.33 W/m·K (0.191 BTU/hr·ft·°F). Basis: typical. Source: BASF, Ultramid A3K Product Information.

Specific heat of Plastic Nylon PA66

The specific heat capacity of Plastic Nylon PA66 is 1,700 J/kg·K (0.406 BTU/lb·°F). Basis: typical. Source: BASF, Ultramid A3K Product Information.

Coefficient of thermal expansion of Plastic Nylon PA66

Plastic Nylon PA66 expands 98 µm/m·K (54.4 µin/in·°F): a 100 mm part grows 490 µm over a 50 °C rise. Basis: longitudinal, 23-55 °C. Source: BASF, Ultramid A3K Product Information.

Thermal diffusivity of Plastic Nylon PA66

Computed from the conductivity, density and specific heat (k / ρc): 0.172 mm²/s, how fast a temperature change spreads through it.

Melting point of Plastic Nylon PA66

Plastic Nylon PA66 melts at 260 °C (500 °F). Basis: DSC. Source: BASF, Ultramid A3K Product Information.

Maximum service temperature of Plastic Nylon PA66

The maximum service temperature of Plastic Nylon PA66 is 101 °C (214 °F). Basis: IEC 60216 temperature index, 20000 h. Source: BASF, Ultramid A3K Product Information.