Plastic PMMA

Plastic PMMA (Acrylic) strength, stiffness, density and thermal properties, with their source.

A bracket in Plastic PMMA, smooth finish.

Mechanical
Yield strength	not given (tensile used)
Ultimate tensile strength	80MPa1
Compressive strength	110MPa1
Flexural strength	115MPa1
Elongation at break	5.5%1
Young's modulus (stiffness)	3.3GPa1
Density	1,190kg/m³1
Strength to weight	67.2kN·m/kg
Stiffness to weight	2.77MN·m/kg
Poisson's ratio	0.371
Shear modulus	1.2GPa
Bulk modulus	4.23GPa
Speed of sound	1,665m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal
Thermal conductivity	0.19W/m·K1
Thermal expansion	0-50 °C70µm/m·K1
100 mm part over a 50 °C swing	350µm growth
Specific heat	1,470J/kg·K1
Heats up and cools (diffusivity)	0.109mm²/s
Thermal shock resistance	41.5W/m
Max service temperature	80°C1

Thermal conductivity against densityHigher and further left: spreads more heat for its weight

Thermal expansion against thermal conductivityLower and further right: warps less when heated

Sources1 document: Röhm

Values for: Bulk polymer (molded or machined). Röhm PLEXIGLAS GS 0F00 cast acrylic sheet, typical values at 23 °C / 50 % RH (Röhm Technical Information Ref. No. 211-1)

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PLEXIGLAS GS and XT Technical Information (Ref. No. 211-1)Röhmarchived copyUltimate tensile strength: typical, 23 °CCompressive strength: compressive yield stress, typicalFlexural strength: typicalElongation at break: typicalYoung's modulus (stiffness): typical, short-termDensity: typicalPoisson's ratio: typicalThermal conductivity: typicalThermal expansion: 0-50 °CSpecific heat: typicalMax service temperature: max. permanent service temperature

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Thermal properties of Plastic PMMA

Thermal conductivity of Plastic PMMA

Plastic PMMA has a thermal conductivity of 0.19 W/m·K (0.11 BTU/hr·ft·°F). Basis: typical. Source: Röhm, PLEXIGLAS GS and XT Technical Information (Ref. No. 211-1)archived copy.

Specific heat of Plastic PMMA

The specific heat capacity of Plastic PMMA is 1,470 J/kg·K (0.351 BTU/lb·°F). Basis: typical. Source: Röhm, PLEXIGLAS GS and XT Technical Information (Ref. No. 211-1)archived copy.

Coefficient of thermal expansion of Plastic PMMA

Plastic PMMA expands 70 µm/m·K (38.9 µin/in·°F): a 100 mm part grows 350 µm over a 50 °C rise. Basis: 0-50 °C. Source: Röhm, PLEXIGLAS GS and XT Technical Information (Ref. No. 211-1)archived copy.

Thermal diffusivity of Plastic PMMA

Computed from the conductivity, density and specific heat (k / ρc): 0.109 mm²/s, how fast a temperature change spreads through it.

Maximum service temperature of Plastic PMMA

The maximum service temperature of Plastic PMMA is 80 °C (176 °F). Basis: max. permanent service temperature. Source: Röhm, PLEXIGLAS GS and XT Technical Information (Ref. No. 211-1)archived copy.