Airfoam Logo

Geofoam & Void Fill Solutions

Geofoam is a geo-technical fill material used as an alternative to other fill materials, as a soil stabilizer, and in many other engineered applications. Due to its ultra-light weight, Geofoam is cost effective and usually does not require surcharging, preloading, and staging that's often necessary with other materials. With outstanding stability, EPS Geofoam resists decomposition, moisture and many adverse conditions, including freeze-thaw cycles, while providing excellent compressive strength over very long service periods.

Geofoam is 50 - 100 times lighter than soils and fast to install even in the rain. Geofoam blocks arrive at the jobsite ready to place, factory-cut to size per approved drawings. If additional fitting at the site is required, it is easily accomplished using portable hot wire cutters. The standard full-size blocks are 48½" x 48½" x 194" (1.23m x 1.23m x 4.92m).

Applications

Under Highways, Bridge Abutments, Bridge Underfill, Fill for Landscaping & Green Roofs, Roads over Poor Soils, Retaining Wall Backfill, Slope Stabilization, Frost-protected Shallow Foundations, Greenhouse Foundations, Culverts, Pipelines, Rail Embankment, Stadium Seating, Levees, Airport Taxiways & more

Geofoam Types, Properties, Quality Assurance

EPS is a closed cell, rigid foam that uses Air as main ingredient.

Material properties of Airfoam's various Geofoam & Flotation Types
Property*
Units
Airfoam Types
ASTM Test
G15
G19
G22
G24
G29
G39
Density
Minimum
kg/m3 14.4 18.4 21.6 24.0 28.8 38.4 D1622
lb/ft3 0.9 1.15 1.35 1.5 1.8 2.4
Compressive Resistance
@ 1% Deformation
Minimum
kPa 25 40 50 57 75 103 D1621
Proc.A
psi 3.6 5.8 7.3 8.3 10.9 15
Elastic Modulus**
typical
kPa 2500 4000 5000 5800 7500 10300 D1621
psi 360 580 730 840 1090 1500
Flexural Strength
Minimum
kPa 172 207240 276 345 414 C203
Proc.B
psi 25 3035 40 50 60
Third-Party Certified Type EPS15 EPS19    EPS29   D6817
Additional Compressive Resistance Properties**
@ 5% Deformation
Minimum
kPa 55 90 115 140 170 241 D1621
Proc.A
psi 8.0 13.1 16.7 20.0 24.7 35.0
@ 10% Deformation
Minimum
kPa 70 110 135 157 200 276
psi 10.2 16.0 19.6 22.7 29.0 40.0

* 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.   ** The elastic limit/yield point is between 1% and 2% strain. Compressive resistances at 5% and 10% strain are provided for applications where the intended end-use includes plastic (permanent) deformation under load; to limit it, use the 1% deformation values for design.

The ASTM Standard D6817 "Standard Specification for Rigid Cellular Polystyrene Geofoam" provides material properties of various EPS Types:

Property*
Units
Types
ASTM Test
EPS15
EPS19
EPS22
EPS29
EPS39
Density
Minimum
kg/m3 14.4 18.4 21.6 28.8 38.4 D1622
lb/ft3 0.9 1.15 1.35 1.8 2.4
Compressive Resistance
@ 1% Deformation
Minimum
kPa 25 40 50 75 103 D1621
Proc.A
psi 3.6 5.8 7.3 10.9 15
Flexural Strength
Minimum
kPa 172 207240 345 414 C203
Proc.B
psi 25 3035 50 60
Limiting Oxygen Index
Minimum
% 24 2424 24 24 D2863
Additional Compressive Resistance Properties**
Compressive Resistance
@ 5% Deformation
Minimum
kPa 55 90 115 170 241 D1621
Proc.A
psi 8.0 13.1 16.7 24.7 35.0
Compressive Resistance
@ 10% Deformation
Minimum
kPa 70 110 135 200 276 D1621
Proc.A
psi 10.2 16.0 19.6 29.0 40.0

* 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.   ** Compressive resistance at 5% and 10% deformation are provided for applications where the intended end-use includes long-term (plastic) deformation under load.

Additional Properties for all Types

Expanded polystyrene (EPS) is resistant to mold & fungi 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.
Limiting Oxygen Index: min. 24% per ASTM D2863. Airfoam's EPS for construction applications contains a polymeric (non-HBCD) flame-retardant modifier.
Max. service temperature: Long-Term Exposure 75°C [167°F]; Intermittent Exposure 80°C [176°F]
Thermal expansion coefficient: 5-7 • 10-5/°K
Capillarity: None;  Buoyancy-Force: min. 900 kg/m³ [56 lbs/ft³]
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.
Load Distribution: Poisson's ratio ≈0.12 within the elastic range; Coefficient of Friction: ≈0.5 along molded, clean faces
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.
GHS Classification: Non-Hazardous, see SDS
CAUTION: EPS products are combustible and must not be exposed to excessive heat, sparks, open flames, or any other sources of ignition. 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.

Geofoam Design Guide