Americas Styrenics STYRON™ 668 General Purpose Polystyrene Resin

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Americas Styrenics STYRON™ 668 General Purpose Polystyrene Resin
Categories:	Polymer; Thermoplastic; Polystyrene (PS); Polystyrene, Molded, Unreinforced
Material Notes:	STYRON™ 668 is a general purpose polystyrene with medium flow and a balance of heat resistance and stiffness characteristics that make it suitable for applications such as CD jewel boxes. STYRON™ 668 complies with U.S. FDA 21 CFR 177.1640. Information provided by Dow Americas Styrenics was formed in 2008 as a joint venture between Dow Chemical and Chevron Phillips Chemical Company. Styron was a Dow trade name before the JV formation.
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Physical Properties	Metric	English	Comments

Specific Gravity	1.04 g/cc	1.04 g/cc	ASTM D792
Linear Mold Shrinkage	0.0030 - 0.0070 cm/cm	0.0030 - 0.0070 in/in	ASTM D955
Melt Flow	5.3 g/10 min @Load 5.00 kg, Temperature 200 °C	5.3 g/10 min @Load 11.0 lb, Temperature 392 °F	ASTM D1238

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	51.0 MPa	7400 psi	0.5 x 0.125 in. specimen; 0.2 in/min; ASTM D638
Tensile Strength, Yield	51.0 MPa	7400 psi	0.5 x 0.125 in. specimen; 0.2 in/min; ASTM D638
Elongation at Break	2.0 %	2.0 %	0.5 x 0.125 in. specimen; 0.2 in/min; ASTM D638
Tensile Modulus	3.134 GPa	454.5 ksi	0.5 x 0.125 in. specimen; 0.2 in/min; ASTM D638
Flexural Strength	102 MPa	14800 psi	0.05 in/min; 3-point; ASTM D790
Flexural Modulus	3.54 GPa	513 ksi	0.05 in/min; 3-point; ASTM D790
Izod Impact, Notched	0.214 J/cm	0.400 ft-lb/in	0.5 x 0.125 in.; ASTM D256

Thermal Properties	Metric	English	Comments
CTE, linear	90.0 µm/m-°C @Temperature 20.0 °C	50.0 µin/in-°F @Temperature 68.0 °F	ASTM D696
Deflection Temperature at 0.46 MPa (66 psi)	88.9 °C	192 °F	unannealed; injection molded; ASTM D648
Deflection Temperature at 1.8 MPa (264 psi)	77.2 °C	171 °F	unannealed; injection molded; ASTM D648
Vicat Softening Point	105 °C	221 °F	120°C/hr, 1 kg; ASTM D1525-B
Flammability, UL94	HB @Thickness 1.52 mm	HB @Thickness 0.0600 in

Optical Properties	Metric	English	Comments
Refractive Index	1.59	1.59	ASTM D542
Haze	1.0 %	1.0 %	ASTM D1003
Transmission, Visible	90 %	90 %	ASTM D1003

Compliance Properties	Metric	English	Comments
FDA	Yes	Yes	See notes for details.

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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PDOW1078 / 30282

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