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How is GPS Insulation "Super Charged?”
This new innovative Graphite Polystyrene (GPS) insulation product has infused high-purity graphite particles into the Expanded Polystyrene (EPS) cell structure which gives the insulation its distinctive dark grey color. The graphite particles reflect and absorb energy and significantly improves insulation capacity by up to 30%. As an example, as radiant heat moves through the Neopor insulation, it reflects it hundreds of times inside the cells wall, significantly slowing down the transfer of heat and making it more energy efficient.
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Graphite Polystyrene Insulation Advantage
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  • Can be used anywhere that tradition EPS was used Roofing, EIFS, Below-Grade, Walls, Liners, Siding, Coolers, ICFs, SIPs and GeoFoam
  • Reduce board thickness by 30% to attain required R-Value
  • When the temperature goes down the R-Value increases and you get more efficiency out of your insulation when you need it most
  • EPS, "the Safe Insulation" is manufactured without the use of CFC and HCFC which provides a healthy, safer environment for our children
  • The R-Value stays stable over time and you actually get what you pay for
  • Custom shapes and sizes as it is molded vs extruded
  • Very Low moisture absorption and is great for below applications as well (Class III Vapor Permeable)
  • EPS is lightweight, easy to install, durable, and resistant to rotting, mold and mildew.
Cost • Higher R-Value • Stability
Graphite Polystyrene is Powerful Insulation
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Graphite Polystyrene has the ability to increase in R-value 4% - 10% as the temperature goes down. In colder climates GPS insulation really powers up when it gets cold outside making even it more energy efficient and very cost effective.
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Most rigid foam insulation fail badly when exposed to water. From the graphs above Graphite Polystyrene performs well when it comes to moisture management. GPS as ideal insulation has the ability to shed excess water and allow water to pass through.

Neopor results of extreme conditions cycling test (Freeze Thaw Study ASTM C1512) are provided by Intertek, Evaluation Center, 2015. EPS and XPS results based on independent Test of Expanded Polystyrene referenced in Technical Bulletin - EPS Industry Alliance, 2014.

Neopor® Properties

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Neopor® Video
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Neopor in many of our products
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Plymouth Foam Building Materials, is one of the nation's leading manufacturers of expanded polystyrene (EPS) products. The DuraSpec™ line of Building Products include a wide variety of products for both commercial and residential construction and numerous custom solution applications. Plymouth Foam offers Neopor in many of its products such as Neopor roofing insulation, Neopor Goldwall, Neopor siding insulation, Neopor foundation insulation and Neopor wall insulation. Graphite Polystyrene (GPS) offers one of the best and most stable r-values for rigid foam insulation.
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