Airfoam EPS Solutions

EPS Foam Insulation Properties

The Canadian CAN/ULC-S701 "Standard for Thermal Insulation, Polystyrene, Boards and Pipe Covering" provides material properties of various EPS Types:

Thermal Resistance*
RSI / 25mm thickness
Minimum @ 24°C
C518 m²•°C/ (W•25mm)0.650.700.74
Thermal Resistance*
R-Value / inch thickness
Minimum @ 75°F
C518 ft²•hr•°F/ (BTU•in)3.754.044.27
Water Vapor Permeance*
Maximum at 25mm [1inch] thickness
Dimensional Stability D2126 7 Days
@ 70±2°C
% linear
Flexural Strength
Water Absorption
D2842 % by
Compressive Strength
Minimum @ 10% Deformation
Limiting Oxygen Index

* Values are for 25mm [1 inch] thick samples with natural skins intact. Better values will result for thicker materials.  ** The test methods used to determine the above material properties provide a means of comparing different cellular plastic thermal insulations. 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 insulation product that uses Air as main component and does not contain the blowing agent gases HCFC or CFC, which provide a temporary increase in thermal resistance of some other insulation materials at very high environmental costs. EPS insulation resists moisture with Low Environmental Impact, High Long-Term Thermal Resistance & Good Drying Potential over the long service periods of buildings. Continuous insulation eliminates thermal bridging, increasing the total effective insulation value.

¾ Hour Fire Rating per CAN/ULC S101, ASTM E119 for Composite Wall Assembly with EPS c.i.

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.
Capillarity: None
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 stucco or 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.

Get In Touch

Tel: (604) 590-2876
Fax: (604) 590-8412

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7398 132nd Street
Surrey, BC V3W4M7 Canada
We are proud to be ISO 9001 and 14001 certified
We accept CLEAN and PALLETIZED EPS for Recycling

Did You Know...

Airfoam EPS provides the highest R-Value per dollar over other rigid insulation boards.

Airfoam EPS offers Long Term Thermal Resistance & drying capacity unlike other foam insulation materials.

EPS gets recycled more than most other plastics.

About Airfoam

Airfoam is a part of Aqua-Pak, the nation's leading manufacturer of large expanded polystyrene (EPS) boxes for transportation of perishables for over 30 years. Airfoam works with professionals to construct high-quality building insulation systems, geofoam, and flotation solutions at a minimal cost.