Plastic LCP GF30 vs. Plastic POM/Acetal

Compare Plastic LCP GF30 vs. Plastic POM/Acetal strength, stiffness, weight and thermal properties.

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Plastic LCP GF30Bulk polymer (molded or machined)

Plastic POM/AcetalBulk polymer (molded or machined)

Mechanical
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Yield strength	not given (tensile used)	69MPasourcetypical (single ASTM D638 tensile strength)
Ultimate tensile strength	115MPasourcetensile strength (ISO 527)	69MPasourcetypical
Compressive strength	not sourced	124MPasourcecompressive stress at 10% deformation
Flexural strength	184MPasourcetypical (ISO 178)	99MPasourceflexural yield strength, typical
Elongation at break	1.5%sourcetensile elongation (ISO 527)	75%sourcetypical
Young's modulus (stiffness)	11.5GPasourcetensile modulus (ISO 527)	2.8GPasourcetypical
Density	1,610kg/m³sourcetypical	1,420kg/m³sourcetypical (DuPont product information for Delrin 100 NC010; 'The data listed here fall within the normal range of product properties')
Strength to weight	71.4kN·m/kg47% higher	48.6kN·m/kg
Stiffness to weight	7.14MN·m/kg3.62x higher	1.97MN·m/kg
Poisson's ratio	not sourced	0.35sourcetypical
Shear modulus	not sourced	1.04GPa
Bulk modulus	not sourced	3.11GPa
Speed of sound	2,673m/s	1,404m/s
Thermal
Thermal conductivity	0.5W/m·Ksourcehot disk (ISO 22007-2), temperature not stated	0.4W/m·Ksourcetypical
Thermal expansion	20µm/m·Ksourceflow direction (MD), mean 50-150 °C	122µm/m·Ksourcemean, 29 to 60 °C
100 mm part over a 50 °C swing	100µm growth6.1x less	610µm growth
Specific heat	839J/kg·KsourceASTM E1269, temperature not stated	1,465J/kg·Ksourceaverage -18 to 100 °C, Delrin acetal resins (not grade-specific)
Heats up and cools (diffusivity)	0.37mm²/s1.93x faster	0.192mm²/s
Thermal shock resistance	not sourced	52.5W/m
Melting point	not sourced	175°Csourcecrystalline melting point
Max service temperature	288°CsourceHDT 1.8 MPa (ISO 75)	125°CsourceHDT 1.8 MPa (annealed)
Values for	Sumitomo Chemical SUMIKASUPER LCP E6006L (30% glass fibre; high strength, low shrinkage); SUMIKASUPER LCP Technical Note, Version 04 / Nov. 2023, typical values.	DuPont Delrin 100 acetal homopolymer, Table 2 'Typical Properties of Delrin Acetal Resins' (ASTM methods), Delrin Design Guide Module III hosted on delrin.com

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 POM/Acetal?

Plastic LCP GF30 is stronger: its tensile strength is 115 MPa against yield strength 69 MPa for Plastic POM/Acetal (1.67x).

Which is lighter, Plastic LCP GF30 or Plastic POM/Acetal?

Plastic POM/Acetal is lighter: 1,420 kg/m³ against 1,610 kg/m³ for Plastic LCP GF30.

Which is stiffer, Plastic LCP GF30 or Plastic POM/Acetal?

Plastic LCP GF30 is stiffer: Young's modulus 11.5 GPa against 2.8 GPa for Plastic POM/Acetal, 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 POM/Acetal?

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	Plastic POM/Acetal
Stiff rod or tie (tension)	lighter	3.62x heavier
Stiff beam (bending)	lighter	1.79x heavier
Stiff panel or plate	lighter	41% heavier
Strong rod or tie	lighter	47% heavier
Strong beam	lighter	24% heavier
Strong panel or plate	lighter	14% 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 Plastic POM/Acetal?

Plastic LCP GF30 conducts heat better: 0.5 W/m·K against 0.4 W/m·K for Plastic POM/Acetal.

Which expands less with temperature?

Plastic LCP GF30 expands less: 20 µm/m·K against 122 µm/m·K for Plastic POM/Acetal.

Among 72 materials

Stiffness against density

Strength against density