Plastic LCP GF30 vs. Solder SAC305

Compare Plastic LCP GF30 vs. Solder SAC305 strength, stiffness, weight and thermal properties.

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Plastic LCP GF30Bulk polymer (molded or machined)

Mechanical
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Yield strength	not given (tensile used)	22MPasourcetypical
Ultimate tensile strength	115MPasourcetensile strength (ISO 527)	39.6MPasourcetypical
Flexural strength	184MPasourcetypical (ISO 178)	not sourced
Elongation at break	1.5%sourcetensile elongation (ISO 527)	49%sourcetypical
Young's modulus (stiffness)	11.5GPasourcetensile modulus (ISO 527)	6.9GPasourcetypical, temperature and strain rate not stated
Density	1,610kg/m³sourcetypical4.57x lighter	7,350kg/m³sourcetypical
Strength to weight	71.4kN·m/kg23.9x higher	2.99kN·m/kg
Stiffness to weight	7.14MN·m/kg7.61x higher	0.939MN·m/kg
Poisson's ratio	not sourced	0.35sourcetypical
Shear modulus	not sourced	2.56GPa
Bulk modulus	not sourced	7.67GPa
Speed of sound	2,673m/s	969m/s
Thermal
Thermal conductivity	0.5W/m·Ksourcehot disk (ISO 22007-2), temperature not stated	61W/m·Ksourcetypical, temperature not stated
Thermal expansion	20µm/m·Ksourceflow direction (MD), mean 50-150 °C	21.9µm/m·Ksourcemean, 20-100 °C (MacDermid Alpha)
100 mm part over a 50 °C swing	100µm growth9% less	110µm growth
Specific heat	839J/kg·KsourceASTM E1269, temperature not stated	232J/kg·Ksourcetypical (MacDermid Alpha)
Heats up and cools (diffusivity)	0.37mm²/s	35.8mm²/s96.6x faster
Thermal shock resistance	not sourced	5,773W/m
Melting point	not sourced	217–220°Csourcesolidus-liquidus
Max service temperature	288°CsourceHDT 1.8 MPa (ISO 75)	not sourced
Values for	Sumitomo Chemical SUMIKASUPER LCP E6006L (30% glass fibre; high strength, low shrinkage); SUMIKASUPER LCP Technical Note, Version 04 / Nov. 2023, typical values.	SAC305 (Sn96.5Ag3.0Cu0.5) solder alloy, bulk; Indium Corporation Indalloy 256 (SAC305) for Preforms product data sheet (Form No. 100346 R0, 2024), selected properties, test temperature not stated; expansion and specific heat from MacDermid Alpha VACULOY SAC TDS (06 September 2023).

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 Solder SAC305?

Plastic LCP GF30 is stronger: its tensile strength is 115 MPa against yield strength 22 MPa for Solder SAC305 (5.23x).

Which is lighter, Plastic LCP GF30 or Solder SAC305?

Plastic LCP GF30 is lighter: 1,610 kg/m³ against 7,350 kg/m³ for Solder SAC305.

Which is stiffer, Plastic LCP GF30 or Solder SAC305?

Plastic LCP GF30 is stiffer: Young's modulus 11.5 GPa against 6.9 GPa for Solder SAC305, 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 Solder SAC305?

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, strong rod or tie, strong beam, strong panel or plate.

Part that must be	Plastic LCP GF30	Solder SAC305
Stiff rod or tie (tension)	lighter	7.61x heavier
Stiff beam (bending)	lighter	5.89x heavier
Stiff panel or plate	lighter	5.41x heavier
Strong rod or tie	lighter	23.9x heavier
Strong beam	lighter	13.8x heavier
Strong panel or plate	lighter	10.4x heavier

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 Solder SAC305?

Solder SAC305 conducts heat better: 61 W/m·K against 0.5 W/m·K for Plastic LCP GF30.

Which expands less with temperature?

Plastic LCP GF30 expands less: 20 µm/m·K against 21.9 µm/m·K for Solder SAC305.

Among 72 materials

Stiffness against density

Strength against density