NOVA Chemicals Dytherm® 340R Expandable Polystyrene

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NOVA Chemicals Dytherm® 340R Expandable Polystyrene (discontinued **)
Categories:	Polymer; Thermoplastic; Polystyrene (PS); Expanded Polystyrene (EPS)
Material Notes:	This is a special grade consisting of spherical beads of a blend of polystyrene-polyphenylene ether containing pentane as expansion agent, typically used for medium density foam with improved thermal resistance. Applications: This grade is used for medium density foam with wall-thickness generally greater than or equal to 10 mm and with improved thermal resistance. Typical applications include hot-water insulation and automotive parts (interior and exterior). Processing of DYTHERM beads on pressurized batch pre-expander is recommended. It can be process on a continuous pre-expander when higher densities are acceptable. This grade should not be used for food contact applications. Information provided by NOVA Chemicals.
Key Words:	Expanded Polystyrene, EPS
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Physical Properties	Metric	English	Comments

Bulk Density	0.620 g/cc	0.0224 lb/in³
Density	>= 0.0300 g/cc	>= 0.00108 lb/in³	Minimum achievable; Single stage pre-expansion in continuous expander at atmospheric pressure
	0.0300 - 0.100 g/cc	0.00108 - 0.00361 lb/in³	Normal molded density assuming cost optimized selection of processing conditions.
Bead Size	1.00 - 1.50 mm	0.0394 - 0.0591 in
	0.900 - 1.60 mm	0.0354 - 0.0630 in	Breda Laboratory Analytical Methods 90.30

Chemical Properties	Metric	English	Comments
Styrene Content	<= 0.10 %	<= 0.10 %	Residual Styrene Monomer Content per Breda Laboratory Analytical Methods 90.16
Blowing Agent Content	>= 5.8 %	>= 5.8 %	Breda Laboratory Analytical Methods 90.18

Thermal Properties	Metric	English	Comments
Maximum Service Temperature, Air	118 °C	244 °F	Modified ISO 2796-1980; Typical maximum temperature to which parts can be exposed short term (1 hour) without significant deformation (<1%).

**
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PNOVA233 / 55134

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