Plastic LCP GF30 vs. Plastic Nylon PA66

Compare Plastic LCP GF30 vs. Plastic Nylon PA66 strength, stiffness, weight and thermal properties.

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Plastic LCP GF30Bulk polymer (molded or machined)

Plastic Nylon PA66Bulk polymer (molded or machined)

Mechanical
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Yield strength	not given (tensile used)	85MPasourcetypical, dry
Ultimate tensile strength	115MPasourcetensile strength (ISO 527)	not sourced
Flexural strength	184MPasourcetypical (ISO 178)	not sourced
Elongation at break	1.5%sourcetensile elongation (ISO 527)	30%sourcenominal strain at break, dry
Young's modulus (stiffness)	11.5GPasourcetensile modulus (ISO 527)	3GPasourcetypical, dry
Density	1,610kg/m³sourcetypical	1,130kg/m³sourcetypical42% lighter
Strength to weight	71.4kN·m/kg	75.2kN·m/kg5% higher
Stiffness to weight	7.14MN·m/kg2.69x higher	2.65MN·m/kg
Poisson's ratio	not sourced	0.4sourcebase material: unfilled polyamide (PA), conditioned, maker design-guide family value (Covestro Table 3-1)
Shear modulus	not sourced	1.07GPa
Bulk modulus	not sourced	5GPa
Speed of sound	2,673m/s	1,629m/s
Thermal
Thermal conductivity	0.5W/m·Ksourcehot disk (ISO 22007-2), temperature not stated	0.33W/m·Ksourcetypical
Thermal expansion	20µm/m·Ksourceflow direction (MD), mean 50-150 °C	98µm/m·Ksourcelongitudinal, 23-55 °C
100 mm part over a 50 °C swing	100µm growth4.9x less	490µm growth
Specific heat	839J/kg·KsourceASTM E1269, temperature not stated	1,700J/kg·Ksourcetypical
Heats up and cools (diffusivity)	0.37mm²/s2.15x faster	0.172mm²/s
Thermal shock resistance	not sourced	57.2W/m
Melting point	not sourced	260°CsourceDSC
Max service temperature	288°CsourceHDT 1.8 MPa (ISO 75)	101°CsourceIEC 60216 temperature index, 20000 h
Values for	Sumitomo Chemical SUMIKASUPER LCP E6006L (30% glass fibre; high strength, low shrinkage); SUMIKASUPER LCP Technical Note, Version 04 / Nov. 2023, typical values.	BASF Ultramid A3K (PA66, unreinforced injection-moulding grade), Product Information 02/2026, dry values (ISO methods)

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Is Plastic LCP GF30 stronger than Plastic Nylon PA66?

Plastic LCP GF30 is stronger: its tensile strength is 115 MPa against yield strength 85 MPa for Plastic Nylon PA66 (35%).

Which is lighter, Plastic LCP GF30 or Plastic Nylon PA66?

Plastic Nylon PA66 is lighter: 1,130 kg/m³ against 1,610 kg/m³ for Plastic LCP GF30.

Which is stiffer, Plastic LCP GF30 or Plastic Nylon PA66?

Plastic LCP GF30 is stiffer: Young's modulus 11.5 GPa against 3 GPa for Plastic Nylon PA66, so the same part in Plastic LCP GF30 deflects less under the same load.

Which is lighter for the same job, Plastic LCP GF30 or Plastic Nylon PA66?

For the same stiffness or strength: Plastic LCP GF30 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; Plastic Nylon PA66 is lighter for a strong rod or tie, strong beam, strong panel or plate.

Part that must be	Plastic LCP GF30	Plastic Nylon PA66
Stiff rod or tie (tension)	lighter	2.69x heavier
Stiff beam (bending)	lighter	37% heavier
Stiff panel or plate	lighter	10% heavier
Strong rod or tie	5% heavier	lighter
Strong beam	16% heavier	lighter
Strong panel or plate	22% heavier	lighter

For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).

Which conducts heat better, Plastic LCP GF30 or Plastic Nylon PA66?

Plastic LCP GF30 conducts heat better: 0.5 W/m·K against 0.33 W/m·K for Plastic Nylon PA66.

Which expands less with temperature?

Plastic LCP GF30 expands less: 20 µm/m·K against 98 µm/m·K for Plastic Nylon PA66.

Among 72 materials

Stiffness against density

Strength against density