Commercial | Residential | Multifamily | Wall

For panel integrity in tough conditions

Foam-board insulation engineered for the most demanding composite panel applications, Panel Core XPS Insulation is a Styrofoam™ solution that provides a strong bond surface, resistance to moisture, and resistance to adhesives – which means you can save on glue.


Styrofoam™ Brand Panel Core 40

Styrofoam™ Brand Panel Core 40 is a closed-cell, high performance core material featuring a proprietary extrusion process facilitating precise control of parameters like density, cell size and cell orientation. This process yields foam boards that can stand up to the most demanding and extensive array of composite panel applications. Panel Core 40 is available with straight edge treatment in nominal board thicknesses up to 4”, board lengths up to 216” and board widths up to 50”. Not all product sizes are available in all regions.


Features & benefits

Closed-cell structure
  • Can be used in wet cavity wall environments
  • High moisture resistance
  • Long-term thermal performance
  • Bonds dry, treated, damp and frozen surfaces
  • Can be used under almost all weather conditions
  • Enhanced productivity

    Physical Properties

      Method Unit Value
    R-value per in., min<sup>2</sup> C518 per inch (25 mm), °F•ft2•h/Btu, fresh @ 55°F (13°C) min. per inch (25 mm), °F•ft2 •h/Btu, fresh @ 20°F (-7°C) min 5
    Compressive Strength, min.<sup>1</sup> D1621 psi, min., vertical 40
    Flexural Strength, min.<sup></sup> C203 lb/in2 , min., extruded 75
    Water Absorption, max.<sup></sup> C272 % by volume 0.3
    Water Vapor Permeance, max.<sup>4</sup> E96 perm, max 1.5
    Dimensional Stability, max<sup></sup> - % linear change -
    Coefficient of Linear Thermal Expansion<sup></sup> - x105in/in °F (x102mm/m °C) -
    Complies with ASTM C 578<sup></sup> C578 Type X
    Maximum Use Temperature<sup></sup> - °F (°C) -
    Flame Spread<sup>3</sup> E84 - 15
    Smoke Developed<sup>4</sup> E84 - 165

    1Vertical compressive strength is measured at 10 percent deformation or at yield, whichever occurs first.

    2 R means resistance to heat flow. The higher the R-value, the greater the insulating power.

    3These numerical flame spread and smoke developed ratings are not intended to reflect hazards presented by this or any other material under actual fire conditions.

    4R-values are consistent with criteria of ASTM C578 and the requirements of the FTC R-value rule (16 CFR Part 460)


    Available Sizes

    R-Value Thickness (in.) Board Size (ft.) Edge Treatment
    25 5 2 x 8 Butt edge