Röhm Acrylite® 8N df 21 Acrylic Polymer

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Röhm Acrylite® 8N df 21 Acrylic Polymer
Categories:	Polymer; Thermoplastic; Acrylic (PMMA); Acrylic, General Purpose, Molded
Material Notes:	Superior light diffusion and transmittance is obtained by incorporation of spherical, high MW polymer beads of a different refractive index into the acrylic matrix. Used in lighting, optoelectronics, displays, monitor covers, and projection screens. Information Provided by Evonik CYRO. The former Evonik Methacrylates business has been sold to Röhm (Roehm) GmbH.
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Physical Properties	Metric	English	Comments

Specific Gravity	1.19 g/cc	1.19 g/cc	ASTM D792
Bulk Density	0.660 g/cc	0.0238 lb/in³	ASTM D1895
Water Absorption	<= 0.30 %	<= 0.30 %	ASTM D570
Linear Mold Shrinkage	0.0030 - 0.0060 cm/cm	0.0030 - 0.0060 in/in	ASTM D951
Melt Flow	3.1 g/10 min @Load 3.80 kg, Temperature 230 °C	3.1 g/10 min @Load 8.38 lb, Temperature 446 °F	ASTM D1238

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell M	95	95	ASTM D785
Tensile Strength at Break	79.3 MPa	11500 psi	ASTM D638
Elongation at Break	4.0 %	4.0 %	ASTM D638
Elongation at Yield	4.0 %	4.0 %	ASTM D638
Tensile Modulus	3.79 GPa	550 ksi	ASTM D638
Flexural Strength	138 MPa	20000 psi	ASTM D790
Flexural Modulus	3.45 GPa	500 ksi	ASTM D790
Izod Impact, Notched	0.160 J/cm @Diameter 6.35 mm	0.300 ft-lb/in @Diameter 0.250 in	BAR; ASTM D256

Thermal Properties	Metric	English	Comments
CTE, linear	72.0 µm/m-°C @Temperature 0.000 - 100 °C	40.0 µin/in-°F @Temperature 32.0 - 212 °F	ASTM D696
Deflection Temperature at 1.8 MPa (264 psi)	105 °C @Thickness 6.35 mm	221 °F @Thickness 0.250 in	Annealed; ASTM D648
Vicat Softening Point	119 °C	246 °F	ASTM D1525

Optical Properties	Metric	English	Comments
Refractive Index	1.50	1.50	ASTM D542
Haze	83 %	83 %	ASTM D1003
Yellow Index	<= 2.0 %	<= 2.0 %	ASTM D1925
Transmission, Visible	90 %	90 %	ASTM D1003

Processing Properties	Metric	English	Comments
Middle Barrel Temperature	240 - 250 °C	464 - 482 °F	Cylinder Temp
Melt Temperature	240 - 250 °C	464 - 482 °F
Mold Temperature	37.8 - 79.4 °C	100 - 175 °F
Drying Temperature	79.4 °C	175 °F
Dry Time	3 - 4 hour	3 - 4 hour

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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PCYR00013 / 89017

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