PMMA-I / PMMA (Polymethylmethacrylate/acrylic) Material Data Sheet (impact modified)

PMMA (impact modified) Designation

Polymethylmethacrylate (Impact Modified, Molding and Extrusion)

Acryl, Acrylite, Altuglas, Cyrolite, Diakon, Optix, Plexiglas, Terez

Light fittings, display signs, domestic baths, packaging, safety spectacles, tool handles, motorcycle windscreens, baby incubators

(CH2-C(CH3)COOCH3)n
Material family	Plastic (thermoplastic, amorphous)
Base material	PMMA (Polymethyl methacrylate / acrylic)
Additive	Impact modifier
Polymer code	PMMA-I

Polymer	85	–	95	%
Impact modifier	5	–	15	%

Density

1.11

–

1.18

g/cm³

Young’s modulus	1.6	–	3.3	GPa
Specific stiffness	1.4	–	2.89	MN.m/kg
Yield strength (elastic limit)	37.9	–	58.4	MPa
Tensile strength	34.5	–	62.1	MPa
Specific strength	33.1	–	51.1	kN.m/kg
Elongation	4.6	–	70	% strain
Compressive modulus	1.65	–	2.54	GPa
Compressive strength	43.9	–	96.5	MPa
Flexural modulus	1.38	–	2.96	GPa
Flexural strength (modulus of rupture)	48.3	–	96.5	MPa
Shear modulus	0.493	–	1.23	GPa
Bulk modulus	3.5	–	3.68	GPa
Poisson’s ratio	0.389	–	0.413
Shape factor	5.2
Hardness – Vickers	11	–	18	HV
Hardness – Rockwell M	35	–	78
Hardness – Rockwell R	82	–	90
Elastic stored energy (springs)	292	–	795	kJ/m³
Fatigue strength at 10^7 cycles	13.8	–	24.8	MPa

Glass temperature	96	–	104	°C
Heat deflection temperature 0.45MPa	92	–	99	°C
Heat deflection temperature 1.8MPa	85	–	93	°C
Vicat softening point	94	–	100	°C
Maximum service temperature	80	–	95	°C
Minimum service temperature	-75	–	-65	°C
Thermal conductivity	0.167	–	0.209	W/m.°C
Specific heat capacity	1.4e3	–	1.52e3	J/kg.°C
Thermal expansion coefficient	86.4	–	144	µstrain/°C
Thermal shock resistance	116	–	290	°C
Thermal distortion resistance	0.00127	–	0.0022	MW/m

Electrical resistivity	3.3e23	–	3e24	µohm.cm
Electrical conductivity	5.75e-23	–	5.22e-22	%IACS
Dielectric constant (relative permittivity)	2.7	–	2.9
Dissipation factor (dielectric loss tangent)	0.03	–	0.04
Dielectric strength (dielectric breakdown)	15	–	19.7	MV/m
Comparative tracking index	600			V

Magnetic type

Non-magnetic

Refractive index	1.49	–	1.5
Transparency	Transparent
Acoustic velocity	1.16e3	–	1.73e3	m/s
Mechanical loss coefficient (tan delta)	0.0116	–	0.029