Röhm Plexiglas® hw55 Clear Molding Compound

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Röhm Plexiglas® hw55 Clear Molding Compound
Categories:	Polymer; Thermoplastic; Acrylic (PMMA); Acrylic, General Purpose, Molded
Material Notes:	Description: PLEXIGLAS® hw55 clear is a copolymer based on methyl methacrylate (MMA) with comonomer constituents. Besides showing the familiar properties of standard PLEXIGLAS® molding compound, such as high light transmission good flowability high mechanical strength, surface hardness and abrasion resistance excellent weatherability PLEXIGLAS® hw55 clear offers the additional benefits of increased heat deflection temperature under load improved resistance to stress cracking optimized inherent color PLEXIGLAS® hw55 clear is particularly suitable for injection molding of technical items. Uses of PLEXIGLAS® hw55 clear: lighted keys, luminaire covers, fiber optics. Information provided by degussa. The former Evonik Methacrylates business has been sold to Röhm GmbH (Roehm).
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Physical Properties	Original Value	Comments

Density	1.19 g/cc	ISO 1183
Moisture Absorption at Equilibrium	0.60 %	Humidity Absorption (23°C, 50%); ISO 62
Water Absorption at Saturation	2.2 %	Water Absorption in Water; ISO 62
Melt Flow	1.428 g/10 min @Load 3.80 kg, Temperature 230 °C	ISO 1133

Mechanical Properties	Original Value	Comments
Tensile Strength at Break	80.0 MPa	5 mm/min; ISO 527
Elongation at Break	3.5 %	5 mm/min; ISO 527
Tensile Modulus	3.60 GPa	1 mm/min; ISO 527
Charpy Impact Unnotched	2.00 J/cm² @Temperature 23.0 °C	ISO 179

Thermal Properties	Original Value	Comments
CTE, linear	70.0 µm/m-°C @Temperature 0.000 - 50.0 °C	ASTM E831
Deflection Temperature at 0.46 MPa (66 psi)	109 °C	ISO 75
Deflection Temperature at 1.8 MPa (264 psi)	106 °C	ISO 75
Vicat Softening Point	119 °C	B50; ISO 306
Glass Transition Temp, Tg	122 °C	IEC 10006
Flammability, UL94	HB @Thickness 1.60 mm	IEC 707

Optical Properties	Original Value	Comments
Refractive Index	1.51	ISO 489
Transmission, Visible	90 %	Transmission Factor; DIN 5036

Processing Properties	Original Value	Comments
Processing Temperature	220 - 250 °C	Cylinder Temperature
Melt Temperature	220 - 250 °C
Mold Temperature	60.0 - 90.0 °C
Drying Temperature	<= 109 °C	Predrying
Dry Time	2 - 3 hour	Desiccant-type drier

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