The ASTM Standard D6817 "Standard Specification for Rigid Cellular Polystyrene Geofoam" provides material properties of various EPS Types:
@ 1% Deformation
|Limiting Oxygen Index|
* The test methods used to determine the above material properties provide a means of comparing different rigid, cellular polystyrene geofoam products. They are intended for use in specifications, product evaluations and quality control, but they are not intended to predict end-use product performance.
Expanded Polystyrene (EPS) is a closed cell, rigid foam plastic product that uses Air as main component and does not contain the blowing agent gases HCFC or HFC like other polystyrene foam materials. Closed cell EPS geofoam resists moisture while providing good compressive strength at very low weight over long service periods.
Additional Properties for all EPS Types
Maximum Service Temperature:
Long Term Exposure 75°C [167°F], Intermittent Exposure 80°C [176°F]
Solubility: Insoluble in water and generally chemically inert.
EPS dissolves in hydrocarbons, esters, aldehydes and amines.
Coefficient of Thermal Expansion: 5-7 •10-5/°K
Buoyancy-Floatation: Minimum 900 kg/m³ [50 lbs/ft³]
UV-Light Surface Degradation: EPS can be exposed to direct sunlight for a few weeks. Prolonged exposure to ultraviolet light creates a yellow dust on the surface of EPS products, which has negligible impact on the products' properties, but may require removal before adhering other materials such as self-adhesive membranes.
GHS Classification: Non-hazardous as per GHS and WHMIS
FLAMMABILITY WARNING: Expanded polystyrene (EPS) materials sold for construction use have a fire retardant modifier but, like all organic materials, EPS Products are combustible and must not be exposed to excessive heat, sparks, open flames, or any other sources of ignition. If burned or heated above decomposition temperature, EPS can emit an irritating black smoke and acid gases. Prevent inhalation of smoke or fumes from burning or fabrication activities. In addition, when EPS insulation board is installed in the interior of a building, it must be protected by a proper thermal barrier and the installer must review applicable local, provincial and federal building codes to determine the correct thermal barrier for the particular application.
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Airfoam is a part of Aqua-Pak, the nation's leading manufacturer of expanded polystyrene (EPS) containers for over 30 years. Airfoam works with professionals to construct high-quality building insulation systems, geofoam, and flotation solutions at a minimal cost.