Polystyrene (Heat Resistant, Homopolymer) Material Data Sheet

PS (Heat Resistant) Designation

Polystyrene (Heat Resistant, Homopolymer)

PS (Heat Resistant) Tradenames

Aarolene, Americas Styrenics, Bapolan, Certene, Chuan, Deltech, Diamond, Dylite, Edistir, Eporex, Evosource, Expandable, Extir, Gecet, Grupo Idesa, Hybranch, Hyrene, Icorene, Idemitsu, Innova, King Pearl, Krasten, Kumho, Lgstrene, Ming, Mtegrity, Neftekhim, Nexus, Okirol, Osterlene, Owispol, Polimaxx, Polyrex, Pre-Elec, Primaflex, Shuman, Sinelec, Solarene, Styron, Styropor, Supreme, Supreme Masterbatch, Surespec, Synthos, Tairirex, Taitacell, Taitarex, Total, Valtra, Yanshan

PS (Heat Resistant) Typical uses

Toys, light diffusers, beakers, cutlery, general household appliances, video/audio cassette cases, electronic housings, refrigerator liners.

PS (Heat Resistant) Compositional summary

(CH(C6H5)-CH2)n. Heat-resistant PS grades have volatile content (e.g. styrene monomer) reduced to a minimum, raising the softening point by around 7 deg C compared to general purpose grades.
Material family	Plastic (thermoplastic, amorphous)
Base material	PS (Polystyrene)
Polymer code	PS

PS (Heat Resistant) Composition detail

Polymer

100

PS (Heat Resistant) Physical properties

Density

1.04

–

1.05

g/cm³

PS (Heat Resistant) Mechanical properties

Young’s modulus	3.1	–	3.34	GPa
Specific stiffness	2.97	–	3.2	MN.m/kg
Yield strength (elastic limit)	44.4	–	56.2	MPa
Tensile strength	44.4	–	56.5	MPa
Specific strength	42.5	–	53.8	kN.m/kg
Elongation	2	–	3.6	% strain
Compressive modulus	3.4	–	3.44	GPa
Compressive strength	89.6	–	96.5	MPa
Flexural modulus	3.09	–	3.44	GPa
Flexural strength (modulus of rupture)	89.6	–	96.5	MPa
Shear modulus	1.11	–	1.2	GPa
Bulk modulus	4.79	–	5.03	GPa
Poisson’s ratio	0.383	–	0.398
Shape factor	6.2
Hardness – Vickers	13	–	17	HV
Hardness – Rockwell M	75	–	84
Hardness – Rockwell R	109	–	120
Elastic stored energy (springs)	309	–	486	kJ/m³
Fatigue strength at 10^7 cycles	17.7	–	23	MPa

PS (Heat Resistant) Impact & fracture properties

Fracture toughness	0.7	–	1.1	MPa.m^0.5
Toughness (G)	0.159	–	0.361	kJ/m²
Impact strength, notched 23 °C	2.79	–	3.61	kJ/m²
Impact strength, notched -30 °C	1.9	–	2.1	kJ/m²
Impact strength, unnotched 23 °C	8.66	–	16.4	kJ/m²
Impact strength, unnotched -30 °C	3.87	–	4.27	kJ/m²

PS (Heat Resistant) Thermal properties

Glass temperature	95	–	100	°C
Heat deflection temperature 0.45MPa	91	–	99	°C
Heat deflection temperature 1.8MPa	85	–	95	°C
Vicat softening point	94	–	99	°C
Maximum service temperature	85	–	95	°C
Minimum service temperature	-75	–	-65	°C
Thermal conductivity	0.12	–	0.14	W/m.°C
Specific heat capacity	1.2e3	–	1.3e3	J/kg.°C
Thermal expansion coefficient	122	–	153	µstrain/°C
Thermal shock resistance	96.5	–	133	°C
Thermal distortion resistance	8.29e-4	–	0.00108	MW/m

PS (Heat Resistant) Electrical properties

Electrical resistivity	1e25	–	1e27	µohm.cm
Electrical conductivity	1.72e-25	–	1.72e-23	%IACS
Dielectric constant (relative permittivity)	2.4	–	2.6
Dissipation factor (dielectric loss tangent)	1e-4	–	3e-4
Dielectric strength (dielectric breakdown)	19.7	–	20.7	MV/m
Comparative tracking index	275	–	575	V

PS (Heat Resistant) Magnetic properties

Magnetic type

Non-magnetic

PS (Heat Resistant) Optical, aesthetic and acoustic properties

Refractive index	1.55	–	1.61
Transparency	Transparent
Acoustic velocity	1.72e3	–	1.79e3	m/s
Mechanical loss coefficient (tan delta)	0.012	–	0.0129

PS (Heat Resistant) Absorption & permeability

Water absorption @ 24 hrs	0.0091	–	0.011	%
Water vapor transmission	3.42	–	3.99	g.mm/m².day
Permeability (O2)	120	–	145	cm³.mm/m².day.atm

PS (Heat Resistant) Processing properties

Polymer injection molding	Excellent
Polymer extrusion	Excellent
Polymer thermoforming	Acceptable
Linear mold shrinkage	0.4	–	0.7	%
Melt temperature	177	–	260	°C
Mold temperature	35	–	55	°C
Molding pressure range	34.4	–	138	MPa

PS (Heat Resistant) Durability

Water (fresh)	Excellent
Water (salt)	Excellent
Weak acids	Excellent
Strong acids	Limited use
Weak alkalis	Excellent
Strong alkalis	Acceptable
Organic solvents	Unacceptable
Oxidation at 500C	Unacceptable
UV radiation (sunlight)	Fair
Flammability	Highly flammable