Properties of Syndiotactic Polypropylene (PP)

Syndiotactic polypropylene (sPP) is a distinct form of polypropylene characterized by its regular alternating stereochemical structure. This molecular arrangement imparts unique physical, mechanical, thermal, and electrical properties, making sPP valuable across diverse industrial and research applications.

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The following table provides a comprehensive list of syndiotactic polypropylene (PP) properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).

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Table of Polypropylene (syndiotactic) Properties
Physical Properties
Metric
CategoryThermoplastic
Density890 - 915 kg/m3
Water Absorption0.01 %wt/day
Mechanical PropertiesMetric
Ultimate Tensile Strength35 MPa
Young’s Modulus (E)0.69 - 1.52 GPa
Rockwell Hardness (R)95
Thermal PropertiesMetric
Melting Point135 °C
Thermal Conductivity0.154 W/m·K
Specific Heat Capacity (Cp)1960 J/kg·K
Coefficient of Thermal Expansion (αL)6×10-5 - 9×10-5 1/°C
Glass Transition Temperature (Tg)-10 to -8.2 °C
Electrical PropertiesMetric
Relative Permittivity (@1 MHz) (εr)2.2 - 2.3
Electrical Resistivity1016 Ω·cm
Dielectric Field Strength (Ed)200 - 260 kV/cm
Hazardous DataMetric
Flammability Rating (ANSI/UL 94)Combustible

Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)

Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) A.M. Howatson, P.G. Lun, J.D. Todd, P.D. Engineering Tables and Data. United Kingdom: University of Oxford, Department of Engineering Science, 2009.