Materials / Compare

Ceramic Alumina 96% vs. Plastic PMMA

Compare Ceramic Alumina 96% vs. Plastic PMMA strength, stiffness, weight and thermal properties.

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Ceramic Alumina 96%Sintered ceramic (pressed and fired)
Plastic PMMABulk polymer (molded or machined)
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Mechanical
Yield strengthnot given (tensile used)not given (tensile used)
Ultimate tensile strength221MPasourcetypical tensile strength, 25 °C (ACMA Test #4)80MPasourcetypical, 23 °C
Compressive strength2,068MPasourcetypical, 20 °C (ASTM-C773)110MPasourcecompressive yield stress, typical
Flexural strength358MPasourceflexural strength (MOR), 20 °C (ASTM-F417)115MPasourcetypical
Elongation at breaknot sourced5.5%sourcetypical
Young's modulus (stiffness)303GPasourcetypical, 20 °C (ASTM-C848)3.3GPasourcetypical, short-term
Density3,720kg/m³sourcetypical (ASTM-C20)1,190kg/m³sourcetypical
Strength to weight59.4kN·m/kg67.2kN·m/kg13% higher
Stiffness to weight81.5MN·m/kg29.4x higher2.77MN·m/kg
Poisson's ratio0.21sourcetypical, 20 °C (ASTM-C848)0.37sourcetypical
Shear modulus125GPa104x stiffer in shear1.2GPa
Bulk modulus174GPa4.23GPa
Speed of sound9,025m/s1,665m/s
Thermal
Thermal conductivity24.7W/m·Ksourcetypical, 20 °C (ASTM-C408)0.19W/m·Ksourcetypical
Thermal expansion8.2µm/m·Ksourcemean, 25-1000 °C (ASTM-C372)70µm/m·Ksource0-50 °C
100 mm part over a 50 °C swing41µm growth8.54x less350µm growth
Specific heat880J/kg·Ksourcetypical, 100 °C (ASTM-E1269)1,470J/kg·Ksourcetypical
Heats up and cools (diffusivity)7.55mm²/s69.5x faster0.109mm²/s
Thermal shock resistance1,736W/m41.9x more resistant41.5W/m
Max service temperaturenot sourced80°Csourcemax. permanent service temperature
Values forCoorsTek AD-96, nominal 96% Al2O3 sintered alumina, typical values; CoorsTek "Ceramic Seal Material Properties" (© 2018, 01899 F). AD-96 is the general 96% grade, not the ADS-96R substrate grade.Röhm PLEXIGLAS GS 0F00 cast acrylic sheet, typical values at 23 °C / 50 % RH (Röhm Technical Information Ref. No. 211-1)

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 Ceramic Alumina 96% stronger than Plastic PMMA?

Ceramic Alumina 96% is stronger: its tensile strength is 221 MPa against 80 MPa for Plastic PMMA (2.76x).

Which is lighter, Ceramic Alumina 96% or Plastic PMMA?

Plastic PMMA is lighter: 1,190 kg/m³ against 3,720 kg/m³ for Ceramic Alumina 96%.

Which is stiffer, Ceramic Alumina 96% or Plastic PMMA?

Ceramic Alumina 96% is stiffer: Young's modulus 303 GPa against 3.3 GPa for Plastic PMMA, so the same part in Ceramic Alumina 96% deflects less under the same load.

Which is lighter for the same job, Ceramic Alumina 96% or Plastic PMMA?

For the same stiffness or strength: Ceramic Alumina 96% is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; Plastic PMMA is lighter for a strong rod or tie, strong beam, strong panel or plate.

Part that must beCeramic Alumina 96%Plastic PMMA
Stiff rod or tie (tension)lighter29.4x heavier
Stiff beam (bending)lighter3.07x heavier
Stiff panel or platelighter44% heavier
Strong rod or tie13% heavierlighter
Strong beam1.59x heavierlighter
Strong panel or plate1.88x heavierlighter

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, Ceramic Alumina 96% or Plastic PMMA?

Ceramic Alumina 96% conducts heat better: 24.7 W/m·K against 0.19 W/m·K for Plastic PMMA.

Which expands less with temperature?

Ceramic Alumina 96% expands less: 8.2 µm/m·K against 70 µm/m·K for Plastic PMMA.

Among 72 materials

1k10k0.1110100Density (kg/m³)Young's modulus (GPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonAluminumSteelIronTitaniumSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic UHMWPEPlastic HDPEPlastic PolypropyleneFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelPCB Laminate FR-4SiliconCeramic Aluminum NitrideAluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Magnesium AZ91DSolder SAC305Plastic PBT GF30Plastic PPS GF40Plastic LCP GF30Ceramic Alumina 96%Plastic PMMA
Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronTitaniumSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic HDPEPlastic PolypropyleneFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLA Resin Elastic 50ASLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickPCB Laminate FR-4SiliconAluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Magnesium AZ91DSolder SAC305Plastic PBT GF30Plastic PPS GF40Plastic LCP GF30Ceramic Alumina 96%Plastic PMMA
Strength against density

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