Skip to product information
1 of 1

Airfoam Industries

Expanded Polystyrene Rigid Insulation

Expanded Polystyrene Rigid Insulation

Regular price £5.00 GBP
Regular price Sale price £5.00 GBP
Sale Sold out


Rigid Foam Insulation

Korolite® Expanded Polystyrene (EPS) is a high-performance, closed cell, rigid foam insulation material that uses air as main ingredient. EPS insulation resists moisture and mold/fungi growth with low environmental impacts, high Long-Term Thermal Resistance, and good drying potential over the long service lives of buildings.

Applications & Properties

Korolite® EPS can be used to insulate the entire building envelope, as Void-Fill, and for impact noise reduction in floors.

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

Property1 Units CAN/ULC-S701 Types ASTM Test
Compressive Resistance
Minimum @ 10% Deformation
kPa 70 110 140 D1621
psi 10 16 20
Thermal Resistance2
RSI / 25mm thickness
Minimum @ 24°C
m²•°C/ (W•25mm) 0.65 0.70 0.74 C518
Thermal Resistance
R-Value / inch thickness
Minimum @ 75°F
ft²•hr•°F/ (BTU•in) 3.75 4.04 4.27 C518
Flexural Strength
kPa 170 240 300 C203
psi 25 35 44
Water Vapor Permeance2
Maximum at 25mm thickness
ng/(Pa•s•m²) 300 200 130 E96
perms 5.2 3.5 2.3
Water Absorption3
% by
6.0 4.0 2.0 D2842
Dimensional Stability % linear
change max.
1.5 1.5 1.5 D2126 7 Days
@ 70±2°C
Limiting Oxygen Index % min. 24 24 24 D2863

1 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.  2 Values are for 25mm thick samples with natural skins intact. Better values will result for thicker materials.  3 The lab-test method for water absorption uses complete submersion under a 2-inch head of water for 96 hours, so the values are applicable to specific design requirements only when the end-use conditions are similar to test method requirements.

Additional Properties of EPS

Expanded Polystyrene (EPS) resists mold & fungi growth per ASTM C1338 and has no nutritional value for insects. To protect against termites place adequate physical barriers such as membranes around below-grade EPS.
Max. Service Temperature: Long-Term Exposure 75°C [167°F], Intermittent Exposure 80°C [176°F]
Thermal Expansion coefficient: 5-7•10-5/°K
Dimensional Stability¹: max. 1.5% linear change per ASTM D2126 (7 Days @ 70±2°C)
Solubility: Insoluble in water and in general chemically inert. EPS dissolves in hydrocarbons (e.g. fuels, oils, tar), organic solvents (e.g. acetone/ketones, benzene, paint thinner), ethers, esters, aldehydes and amines. Capillarity: None
UV-light surface degradation: white 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.
Surface Burning Characteristics Canada CAN/ULC-S102.2: Flame-Spread Rating ≤295, Smoke Developed Classification over 500. 
Limiting Oxygen Index: min. 24% per ASTM D2863. Airfoam's EPS for construction applications contains a polymeric (non-HBCD) fire retardant modifier.
CAUTION: EPS products are combustible and must not be exposed to excessive heat, sparks, open flames, or any other sources of ignition. A protective barrier or thermal barrier is required as specified in the appropriate building code. If stored/used in closed containers, confined, or low-lying areas, ensure adequate ventilation to prevent accumulation of flammable pentane vapours. Prevent inhalation of smoke, fumes or dust from burning or fabrication activities. GHS Classification: Non-Hazardous, see SDS

Specify & Install

Korolite® Specifications 100 Types 1, I 130 Types 1+, VIII 160 Types 2, II 200 Types 2+, II+ 250 Types 3, IX 400 Type XIV 600 Type XV

For Tilt-Up with Grid Marks 200 Types 2+, II+ 250 Types 3, IX

 Korolite® Types Overview  Korolite® Installation Guide  30-Year Limited Warranty  Environmental Product Declaration  Shallow Foundations

View full details
  • Free Local Shipping

    Free Local Shipping on Orders over $2500* (*Does not apply to Hiab/Moffat unload deliveries)

    Some products may also have local pick up options

  • Hassle-Free Exchanges

    If you are unhappy with your product(s) for any reason, simply send it back to us, and we will give you a refund or find the product(s) that best suit your needs.

    Returns must be made within 30 days of receipt, and may incur a restocking charge. Please contact us for more information.