Chi Mei Acryrex® CM-205 PMMA

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Chi Mei Acryrex® CM-205 PMMA
Categories:	Polymer; Thermoplastic; Acrylic (PMMA); Acrylic, General Purpose, Molded
Material Notes:	High heat injection grade. It can resist high temperature. High mechanical strength. Applications: The indicator cover of scooter and automobile/sun glasses/digital watch cover. Features: Good Weather Resistance High Heat Resistance High Strength Uses: Automotive Applications Protective Coverings RoHS Compliant Appearance: Clear/Transparent Forms: Pellets Processing Method: Injection Molding Availability: Africa & Middle East Asia Pacific Europe Latin America North America South America
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Physical Properties	Metric	English	Comments

Density	0.700 g/cc	0.0253 lb/in³	Apparent; ASTM D1182
	1.19 g/cc	0.0430 lb/in³	ISO 1183
Water Absorption	0.30 %	0.30 %	Equilibrium; ASTM D570
Linear Mold Shrinkage, Flow	0.0020 - 0.0060 cm/cm	0.0020 - 0.0060 in/in	ASTM D955
Melt Flow	1.8 g/10 min @Load 3.80 kg, Temperature 230 °C	1.8 g/10 min @Load 8.38 lb, Temperature 446 °F	ASTM D1238

Mechanical Properties	Metric	English	Comments
Hardness, Shore M	95 @Thickness 6.35 mm	95 @Thickness 0.250 in	ASTM D785
Tensile Strength, Yield	70.3 MPa @Thickness 3.18 mm	10200 psi @Thickness 0.125 in	6 mm/min; ASTM D638
Elongation at Break	5.0 % @Thickness 3.18 mm	5.0 % @Thickness 0.125 in	6 mm/min; ASTM D638
Flexural Strength	108 MPa @Thickness 6.35 mm	15700 psi @Thickness 0.250 in	2.8 mm/min; ASTM D790
Izod Impact, Notched	0.200 J/cm @Thickness 6.35 mm	0.375 ft-lb/in @Thickness 0.250 in	ASTM D256

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.00e+15 ohm-cm	1.00e+15 ohm-cm	ASTM D257
Dielectric Constant	3.7	3.7	ASTM D150
Dielectric Strength	31.0 kV/mm	788 kV/in	ASTM D149
Dissipation Factor	0.19	0.19	ASTM D150

Thermal Properties	Metric	English	Comments
Deflection Temperature at 1.8 MPa (264 psi)	100 °C @Thickness 6.35 mm	212 °F @Thickness 0.250 in	Unannealed; ASTM D648
Vicat Softening Point	113 °C	235 °F	50°C/hr; ASTM D1525
Flammability, UL94	HB @Thickness 1.59 mm	HB @Thickness 0.0625 in	UL 94

Optical Properties	Metric	English	Comments
Refractive Index	1.49	1.49	ASTM D542
Transmission, Visible	92 % @Thickness 3.18 mm	92 % @Thickness 0.125 in	ASTM D1003

Processing Properties	Metric	English	Comments
Rear Barrel Temperature	185 - 205 °C	365 - 401 °F
Middle Barrel Temperature	200 - 220 °C	392 - 428 °F
Front Barrel Temperature	220 - 240 °C	428 - 464 °F
Mold Temperature	50.0 - 70.0 °C	122 - 158 °F
Drying Temperature	85.0 - 90.0 °C @Time 14400 sec	185 - 194 °F @Time 4.00 hour

Descriptive Properties
Power Factor	0.5		ASTM D150

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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PCHI943 / 109431

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