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Geofoam General Information


Plasti-Fab manufactures moulded expanded polystyrene (EPS) products that have been used successfully in a wide variety of geotechnical applications. GeoSpec® lightweight fill material is expanded polystyrene (EPS) geofoam used in ground fill applications where a lightweight fill material is required. EPS geofoam has been used in projects involving a wide variety of applications worldwide for over 50 years.


GeoSpec EPS Geofoam Applications

  • Road construction over poor soils
  • Road widening
  • Bridge abutment
  • Bridge underfill
  • Culverts, pipelines & buried structures
  • Compensating foundation
  • Rail embankment
  • Landscaping & vegetative green roofs
  • Retaining and buried wall backfill
  • Slope stabilization
  • Stadium & theater seating
  • Levees
  • Airport runway/taxiway
  • Foundations for lightweight structures
  • Special Applications
  • Noise and vibration damping
  • Compression application
  • Seismic application
  • Rockfall/impact protection
  • Permafrost embankments

See Expanded Polystyrene (EPS) Geofoam Applications & Technical Data for a brief highlight of the EPS geofoam use for the above application including applicable properties.

The table below material properties for GeoSpec geofoam product.

Table 1 – Typical Design Considerations

Material Property1 Units D6817 GeoSpec Type Designations2
EPS12 EPS15 EPS19 EPS22 EPS29 EPS39 EPS46
Product Density,
Minimum ASTM C303
kg/m3
(pcf)
11.2
(0.70)
14.4
(0.90)
18.4
(1.15)
21.6
(1.35)
28.8
(1.80)
38.4
(2.40)
45.7
(2.85)
Compressive Resistance
Minimum @ 1% strain
ASTM D1621
kPa
(psi)
15
(2.2)
25
(3.6)
40
(5.8)
50
(7.3)
75
(10.9)
103
(15.0)
128
(18.6)
Flexural Strength
Minimum
ASTM C203
kPa
(psi)
69
(10)
172
(25)
207
(30)
240
(35)
345
(50)
414
(60)
517
(75)
Limiting Oxygen Index
Minimum
ASTM D2863
% 24 24 24 24 24 24 24
Additional Compressive Resistance Properties3
Compressive Resistance
Minimum @ 5% Strain
ASTM D1621
kPa
(psi)
35
(5.1)
55
(8.0)
90
(13.1)
115
(16.7)
170
(25.0)
241
(35.0)
300
(43.5)
Compressive Resistance
Minimum @ 10% Strain
ASTM D1621
kPa
(psi)
40
(5.8)
70
(10.2)
110
(16.0)
135
(19.6)
200
(29.0)
276
(40.0)
345
(50.0)


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1. GeoSpec lightweight fill material properties are third party certified under a certification program administered by Intertek based upon ASTM D7557, Standard Practice for Sampling of Expanded Polystyrene Geofoam Specimens.
2. The material properties for GeoSpec lightweight fill material are third party certified by Intertek.
3. Compressive resistance at 5% and 10% strain in the above table are provided for applications where the intended end-use requires long-term deformation under structural load – i.e., a compressible product.