Technical datasheet

STYRON™ 666H

Supplied byTrinseo- Last Updated on Jul 8, 2025

STYRON™ 666H by Trinseo is a general purpose polystyrene (GPPS) grade. It is clear colored, easy flow, odorless, water insoluble material that is offered in granular form. It demonstrates good strength, chemical stability, and clarity. Both compression molding and injection molding can be used to process it. For disposable cups and media enclosures, it is advised. It is compatible with HIPS blending. STYRON™ 666H complies with U.S. FDA 21 CFR 177.1640, REACH REGULATION (EC) No 1907/2006, RoHS EU Directive 2011/65/EC and WEEE Directive 2012/19/EU.
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STYRON™ 666H properties

Flammability properties

PropertiesValue & unitTest conditionTest method
Flame Rating, UL 940.0 Visible After LoginVisible After LoginVisible After Login

Mechanical properties

PropertiesValue & unitTest conditionTest method
Elongation at Break0.0 Visible After LoginVisible After LoginVisible After Login
Flexural Modulus0.0 Visible After LoginVisible After LoginVisible After Login
Flexural Strength0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Notched Izod0.0 Visible After LoginVisible After LoginVisible After Login
Modulus of Elasticity0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Strength, Ultimate0.0 Visible After LoginVisible After LoginVisible After Login

Other properties

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Tensile Strength at Yield0.0 Visible After LoginVisible After LoginVisible After Login

Physical properties

PropertiesValue & unitTest conditionTest method
Density0.0 Visible After LoginVisible After LoginVisible After Login
Linear Mold Shrinkage, Flow0.0 Visible After LoginVisible After LoginVisible After Login
Melt Mass-Flow Rate (MFR or MFI = Melt Flow Index or MI = Melt Index)0.0 Visible After LoginVisible After LoginVisible After Login

Thermal properties

PropertiesValue & unitTest conditionTest method
CTE, Linear, Parallel to Flow0.0 Visible After LoginVisible After LoginVisible After Login
Decomposition Temperature0.0 Visible After LoginVisible After LoginVisible After Login
Heat Deflection Temperature (HDT), Annealed0.0 Visible After LoginVisible After LoginVisible After Login
Heat Deflection Temperature (HDT), Unannealed0.0 Visible After LoginVisible After LoginVisible After Login
Vicat Softening Temperature0.0 Visible After LoginVisible After LoginVisible After Login

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