Plastic PMMA vs. Plastic PPS GF40

Compare Plastic PMMA vs. Plastic PPS GF40 strength, stiffness, weight and thermal properties.

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Plastic PMMABulk polymer (molded or machined)

Plastic PPS GF40Bulk polymer (molded or machined)

Mechanical
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Yield strength	not given (tensile used)	not given (tensile used)
Ultimate tensile strength	80MPasourcetypical, 23 °C	195MPasourcetensile strength, 5 mm/min
Compressive strength	110MPasourcecompressive yield stress, typical	not sourced
Flexural strength	115MPasourcetypical	285MPasourceflexural strength at break
Elongation at break	5.5%sourcetypical	1.9%sourcestrain at break, 5 mm/min
Young's modulus (stiffness)	3.3GPasourcetypical, short-term	14.7GPasourcetypical, 1 mm/min
Density	1,190kg/m³sourcetypical39% lighter	1,650kg/m³sourcetypical
Strength to weight	67.2kN·m/kg	118kN·m/kg1.76x higher
Stiffness to weight	2.77MN·m/kg	8.91MN·m/kg3.21x higher
Poisson's ratio	0.37sourcetypical	0.35sourceglass-reinforced Fortron PPS (class value, not grade-specific)
Shear modulus	1.2GPa	5.44GPa4.52x stiffer in shear
Bulk modulus	4.23GPa	16.3GPa
Speed of sound	1,665m/s	2,985m/s
Thermal
Thermal conductivity	0.19W/m·Ksourcetypical	0.2W/m·Ksource40% glass-reinforced Fortron, 25 °C (not grade-specific)
Thermal expansion	70µm/m·Ksource0-50 °C	12µm/m·Ksourceparallel (flow), mean -50 to 90 °C
100 mm part over a 50 °C swing	350µm growth	60µm growth5.83x less
Specific heat	1,470J/kg·Ksourcetypical	not sourced
Heats up and cools (diffusivity)	0.109mm²/s	not sourced
Thermal shock resistance	41.5W/m	144W/m3.47x more resistant
Melting point	not sourced	280°CsourceDSC, 10 °C/min
Glass transition	not sourced	90°CsourceDSC, 10 °C/min
Max service temperature	80°Csourcemax. permanent service temperature	270°CsourceHDT 1.8 MPa
Values for	Röhm PLEXIGLAS GS 0F00 cast acrylic sheet, typical values at 23 °C / 50 % RH (Röhm Technical Information Ref. No. 211-1)	Celanese Fortron 1140L4 (PPS, 40% glass fibre), injection moulding; FORTRON PPS Short-Term Properties Guide (PPS-012, 2016); thermal conductivity and Poisson for 40% glass-reinforced Fortron from the Fortron PPS Design Manual (PPS-050, 2013).

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 PMMA stronger than Plastic PPS GF40?

Plastic PPS GF40 is stronger: its tensile strength is 195 MPa against 80 MPa for Plastic PMMA (2.44x).

Which is lighter, Plastic PMMA or Plastic PPS GF40?

Plastic PMMA is lighter: 1,190 kg/m³ against 1,650 kg/m³ for Plastic PPS GF40.

Which is stiffer, Plastic PMMA or Plastic PPS GF40?

Plastic PPS GF40 is stiffer: Young's modulus 14.7 GPa against 3.3 GPa for Plastic PMMA, so the same part in Plastic PPS GF40 deflects less under the same load.

Which is lighter for the same job, Plastic PMMA or Plastic PPS GF40?

For the same stiffness or strength: Plastic PPS GF40 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 PMMA	Plastic PPS GF40
Stiff rod or tie (tension)	3.21x heavier	lighter
Stiff beam (bending)	1.52x heavier	lighter
Stiff panel or plate	19% heavier	lighter
Strong rod or tie	1.76x heavier	lighter
Strong beam	31% heavier	lighter
Strong panel or plate	13% 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 PMMA or Plastic PPS GF40?

Plastic PPS GF40 conducts heat better: 0.2 W/m·K against 0.19 W/m·K for Plastic PMMA.

Which expands less with temperature?

Plastic PPS GF40 expands less: 12 µm/m·K against 70 µm/m·K for Plastic PMMA.

Among 72 materials

Stiffness against density

Strength against density