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	Original Value	Comments

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

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	7400 psi	0.5 x 0.125 in. specimen; 0.2 in/min; ASTM D638
Tensile Strength, Yield	7400 psi	0.5 x 0.125 in. specimen; 0.2 in/min; ASTM D638
Elongation at Break	2.0 %	0.5 x 0.125 in. specimen; 0.2 in/min; ASTM D638
Tensile Modulus	454500 psi	0.5 x 0.125 in. specimen; 0.2 in/min; ASTM D638
Flexural Strength	14800 psi	0.05 in/min; 3-point; ASTM D790
Flexural Modulus	513000 psi	0.05 in/min; 3-point; ASTM D790
Izod Impact, Notched	0.400 ft-lb/in	0.5 x 0.125 in.; ASTM D256

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

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

Compliance Properties	Original Value	Comments
FDA	Yes	See notes for details.

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