Expanded polystyrene or EPS is a lightweight cellular plastic foam material derived from petroleum and natural gas by-products. EPS is economical, sturdy and efficient and meets the Standards Association of Australia Australian Standard AS/NZS 4859.1-2018. No CFCs are used to mould EPS.
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Compression at 10% deformation, min.
Cross-breaking strength, min
Rate of water vapour transmission (max. measured parallel to rise at 23°C
Dimensional stability of legth (max) at 70°C dry condition 7 days
Thermal resistance (min.)at a mean temperature of 23°C (50mm sample)
Flame propogation characteristics:
- median flame duration (max.)
- eigth value (max.)
- median volume retained
- eighth value (min.)
1 W/m.K - 6.93 Btu in ft²h. °F
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EPS for Construction
Expanded Polystyrene is the number one choice for your next construction job.
EPS for Concreting
Concrete formwork - Void former can be manufactured to most shapes specified by designers for projects such as bridge beams, elevated motorways etc in which void forming is fundamental to modern design.
Drainage (stormwater) - Koolfoam specialise in concrete formwork for stormwater drainage
Secant pile walls - Polystyrene is a low cost, simple method of accurately forming guides for secant piled walls
Bolt sleeves - scuppers - Ideal for leaving a void for bolts in cast concrete - may be dissolved after use
Prestressed concrete - Polystyrene blocks are commonly used to reduce the amount of concrete poured
EPS for Pipe Insulation
If you’re after even more efficient pipe insulation, then our KoolfoamULTRA EPS is our cutting-edge product that offers even better thermal insulation than white EPS.
The graphite particles in expanded polystyrene (EPS) reflect and absorb heat and infra-red radiation result in up to 35% more efficient insulation than white EPS.
EPS for Pool Builders
Koolfoam polystyrene in the marine environment.
In the construction of marinas and many other marine applications the buoyancy of EPS can support more weight that alternative materials
eg a cubic metre of EPS with a density of only 16kg/m3 has a buoyancy of 984kg!
Empty enclosures can be punctured and lose buoyancy but a fill of EPS prevents sinking whilst EPS stays in place.
Installation is quick and easy requiring minimal labour and therefore expense; its non-irritant, non-allergenic and odourless nature makes it superior to other insulation alternatives.
Koolfoam EPS is light, water and steam resistant, unaffected by fungi and bacteria, and will not support insect or pest life.
Flotation - Used for buoyancy in the construction of boats of all sizes
Pontoons - A cost effective flotation material in the production of pontoons - easily formed and long lasting in a marine environment
KoolfoamULTRA a new way to insulate with polystyrene
EPS is resistant over long periods to virtually all aqueous media:
• Water, seawater, salt solutions
• Lime, gypsum, Portland cement
• Caustic soda, caustic potash, strong ammonia, liquid manure, lime wash
• Soaps and solutions of wetting agents
• Hydrochloric acid (to 35%), nitric acid (to 50%), sulphuric acid (to 95%)
• Dilute mineral acids and weak acids such as lactic acid, carbonic acid or humic acids in peaty soils
• Solid salls eg wall saltpetre, artificial fertiliser
• Bitumen, bitumen omulsion
• Silicone oils and greases
• Lower alcohols eg methylated spirits
EPS has limited resistance to ie the cellular material may shrink or suffer:
• Liquid paraffin, cooking oils, petroleum jelly, fuel oil
EPS is not resistant to hydrocarbons, chlorinated hydrocarbons, ketones and esters ie the cellular material rapidly collapses or dissolves:
• Fluxed or cut-back bitumen
• Tar and products based on tar
• Organic solvents eg acetone, ethyl acetate, xylene, paint thinners, trichloroethylene, carbon tetrachloride, turpentine
• Saturated hydrocarbons eg white spirit, kerosene
Prolonged exposure of EPS to UV light causes yellowing and embrittlement. Koolfoam recommend protecting EPS from direct outdoor exposure.
Koolfoam EPS is comparatively inert and is unaffected by mildly acid or alkaline building materials such as Portland cement, lime or anhydrite. It is however soluble in many organic solvents and may be damaged by certain commonly-used paints, adhesives, wood preservatives, pasting agents etc. in some cases vapour from these substances can be harmful.
Koolfoam EPS has no nutritive value for micro-organisms and does not rot. Under certain conditions soiled material may carry fungi etc but it is not itself attacked. Even soil bacteria have no effect on EPS. Rodents and birds may occasionally attack exposed EPS; Koolfoam recommends protection with galvanised wire netting if necessary.
(Normal density 16kg/m3)
3.8 x 1013
9.18 x 106
Early Fire Hazard Properties
Comparative testing of Early Fire Hazard Properties for selected materials
Comparative testing of some materials
Australian Hardwood (bare)
Australian Softwood (bare)
Source: EPS: AWT A Test Report No. 9-96156
Other materials: EBS Notes on the Science of Building NSB66.