EPS blocks are versatile and adaptive

StyroBloc is a lightweight, durable, economical and versatile expanded polystyrene foam block that is easy to cut and shape for use across a range of applications.

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Manufactured in Australia from Styroboard EPS expanded polystyrene, StyroBloc EPS blocks are lightweight for easy installation, weather resistant, long-lasting, and provide high levels of thermal insulation and acoustic benefits.

Foam construction blocks are a versatile product that can be used in a range of building applications, including foam concrete void filler, pipe insulation, and intricate polystyrene architectural mouldings.

EPS foam blocks also make excellent cool room insulation. 

StyroBloc can be shaped, cut or laminated to your specific requirements, making it a popular choice for retail and creative foam applications, including expanding foam props, foam retail signage and model making.

Benefits of StyroBloc foam blocks

  • Lightweight & easy to install
  • Versatile & cost effective
  • Excellent thermal insulation properties
  • Weather resistant with low moisture absorption
  • Retains its structural integrity ensuring long term R values
  • Environmentally responsible & fully recyclable
  • Complies with Australian Building Standards AS1366 Part 3 – 1992


  • lightweight reverseVoid filler
  • cost twoCoolroom insulation
  • weather 2Retail signage
  • recycle 2Model making
  • recycle 2Event props

Why buy polystyrene foam blocks from Foamex?

Established in 1982, Foamex is one of Australia’s largest manufacturers and recyclers of polystyrene products and a recognised leader in the development of new and innovative uses of expanded and extruded polystyrene.

  • All Foamex expanded polystyrene (EPS) products, including StyroBloc, are manufactured locally to stringent Australian standards with independent research, testing, and industry consultation.
  • All products are manufactured from the highest-quality expanded polystyrene, which is strength-tested against a range of stringent criteria.
  • Manufacturing technology used to produce Styroboard EPS expanded polystyrene products removes the need for chlorofluorocarbons (CFCs), meaning the products do not produce ozone-depleting gases.
  • Foamex has a closed-loop production model, which means that whatever leaves the factory that is either unused or has reached its end of life can be returned and manufactured into other products, such as StyroBloc, which contains up to 75% recycled polystyrene.
  • Foamex collects and recycles scrap polystyrene from building sites, commercial recycling and recycling bins accessed by the general public.

StyroBloc Product Specifications

  • Sizes
  • Physical Properties
  • Other Properties
    L SL S M H VH VHH32 VHH36 VHH38
Compressive stress at 10% deformation, min. kPa 50 70 85 105 135 165 250 300 350
Cross breaking strength, min. kPa 95 135 165 200 260 320 500 550 600
Rate of vapour transmission, max. measured parallel to rise at 23°C μg/m2.s 710 630 580 520 450 400 340 280 220
Max. dimensional stability of length, width and thickness, 7 days at 70°C  % 1 1 1 1 1 1 1 1 1
Min. thermal resistance (50mm sample) at a mean temperature of 25°C m2K/W R(50/90) 1 1.20 1.22 1.25 1.40 1.41 1.43 1.45 1.5


    L SL S M H VH VHH32 VHH36 VHH38
Density - nominal kg/m3 11 13.5 16 19 24 28 32 36 38
Compressive strength at 1% deformation, max.  kPa 14 23 31 42 58 60 63 65 70
Compressive strength at 5% deformation, max.  kPa 33 59 68 95 134 164 230 290 340
Flexural strength, min. kPa 60 150 178 218 304 337 362 385 413
Elastic modulus, min. kPa 1450 2200 3100 4250 5850 7250 8650 9850 10950
Water absorption by total immersion, max. Vol% 4 4 4 3 3 2 2 1 1
Buoyancy force kg/m3 989 986.5 984 981 976 972 968 965 963
Coefficient of thermal expansion m/m deg K 6.3x10-5 6.3x10-5 6.3x10-5 6.3x10-5 6.3x10-5 6.3x10-5 6.3x10-6 6.3x10-7 6.3x10-8

NB: This information is based on our current knowledge and experience. In view of the many factors that may affect processing and application, this data does not relieve the purchaser of the responsibility of carrying out their own tests and experiments; neither do they imply any legally binding assurance of certain properties or of suitability for a specific purpose. It is the responsibility of those to whom we supply our products to ensure that any proprietary rights and existing laws and legislations are observed.



Width: 1200mm  
Length: 2400mm - 5000mm  
Thickness: 600mm  


FAQs about polystyrene blocks

Why do builders use polystyrene blocks?

Polystyrene blocks are lightweight and easy to handle without using heavy lifting equipment. This also makes them great for difficult terrain and cost-effective transport and installation compared to traditional fill products. They make excellent void filler, saving on using concrete, which is more expensive than polystyrene to transport and install. Expanded polystyrene foam blocks (EPS) are also favoured in construction due to their excellent thermal insulation properties, which help reduce energy costs. EPS is 100% recyclable and moisture resistant, preventing mould and structural damage. It maintains its integrity over time, ensuring durability and longevity, and its versatility allows for varied applications, such as geofoam blocks.

How to cut polystyrene blocks

A variety of tools can be used to cut polystyrene blocks, including hand saws, hot wire cutters, long-blade utility knives, and jigsaws. A hot wire cutter is the quickest and neatest method, but it is important to take safety precautions when cutting EPS blocks with a hot wire or knife.

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