Home (EN)
  • Youtube
    • Products
      • Finnfoam
        • Panel dimensions and types
          • Flat edge
          • Rabbet
          • Tongue and groove
          • Planed and grooved (HU) for sandwich panel structures
          • Basement wall
          • Ventilated foundation
          • Wall and ceiling insulation for timber-framed buildings
          • Grooved panel (URA)
          • Foundation mold
          • Pillar mold
          • Pipe enclosure
          • INFRA panels
          • Edge-reinforced slab
        • Composition and structure
        • CE marking (DoP)
          • Archive
            • DoP - 2018
            • DoP - 2017
            • DoP - 2016
            • DoP - 2015
            • DoP - 2014
            • DoP - 2013
        • Fire safety
        • Product storage
        • Properties
          • Strength
            • Finnfoam Oy's XPS panels’ strength development
          • Moisture properties
          • Thermal insulation capacity
          • Other properties
      • FF-PIR
        • FF-PIR, aluminum surface
          • Sauna
          • ALK tongue and groove
          • ALI flat edge
          • ALS renovation panel
          • K600 between studs
          • K900 between studs
        • FF-PIR, plastic surface
          • PLK tongue and groove
          • PLI flat edge
        • FF-PIR, FR flame proof surface
          • FF-PIR, FR flame proof surface
        • FF-PIR, gypsum surface
          • GYL rabbet
        • CE marking (DoP)
        • Properties
        • Product storage
      • FF-EPS
        • EPS panels
          • FF-EPS 100
          • FF-EPS 100S
          • FF-EPS 60S
          • FF-EPS X 60S
          • FF-EPS ETICS
          • FF-EPS 60S X SILENT
        • CE marking (DoP)
          • Archive
            • DoP - 2016
            • DoP - 2015
        • Technical specifications
        • Product storage
      • Tulppa
        • CE marking (DoP)
          • Archive
            • DoP - 2016
            • DoP - 2015
            • DoP - 2014
            • DoP - 2013
        • Technical specifications
        • Product storage
      • FF-SIGNAL
        • Installation
        • Installation examples
        • FF-SIGNAL structural schematics
        • Product storage
      • FF-FLOOR
        • BULLETIN
      • Product storage
    • Applications
      • Frost insulation
        • Foundation mold
        • Edge-reinforced slab
      • Basement wall
      • Foundations
        • Slab-on-ground floor
        • Ventilated base floor
      • Walls
        • Thermal insulation for exterior walls using FF-PIR polyurethane insulation products
        • Thermal insulation for exterior walls using FF-EPS
        • Thermal insulation for exterior walls using Finnfoam
        • Finnfoam and FF-PIR insulation as vapor barrier
      • Intermediate floor
      • Roof
        • Inverted roof
        • Thermal insulation for roofs and ceilings using FF-PIR polyurethane insulation products
        • Thermal insulation for roofs and ceilings using FF-EPS
        • Finnfoam and FF-PIR insulation as vapor barrier
      • Insulating the ceiling and walls of an older attic
      • Supplementary thermal insulation
        • Supplementary thermal insulation for walls
        • FF-PIR for renovation and supplementary thermal insulation of ceilings and walls
      • Roads and yard areas
        • Finnfoam INFRA panel
      • Pipe trenches
      • Sauna
    • Finnfoam group
      • Vision, strategy and values
      • sustainability
        • Environment
        • Carbon footprint
        • BREEAM
        • Quality
        • Safety
    • Contact
    • LinkedIn
    • Facebook
    • Youtube
    1. Home
    2. Products
    3. Finnfoam
    4. Properties
    5. Strength
    • Finnfoam
      • Panel dimensions and types
      • Composition and structure
      • CE marking (DoP)
      • Fire safety
      • Product storage
      • Properties
        • Strength
          • Finnfoam Oy's XPS panels’ strength development
        • Moisture properties
        • Thermal insulation capacity
        • Other properties
    • FF-PIR
    • FF-EPS
    • Tulppa
    • FF-SIGNAL
    • FF-FLOOR
    • Product storage

    Strength properties

    The short-term and long-term compressive strength of thermal insulation products used for inverted roofs, as frost protection on the ground or to insulate slab-on-ground foundations must be reported, as the insulation products are subjected to particularly significant loads in these applications.

     

    A long-term compressive strength test, i.e. a compressive creep test, conducted for a working life of 50 years will take 608 days, which is why a short-term compressive strength test is used in the industry as a rapid test. The short-term compressive strength can be discovered by compressing the insulation down 10% for few seconds or by continuing to compress the insulation until it reaches failure state. This test can also be used as a faster method for discovering the more important property of the insulation, i.e. its long-term compressive strength rating.

     

    Structures must always be designed according to the long-term compressive strength, i.e. creep, which specifies how much the insulation will compress under the specific load. For example, the long-term compressive strength of Finnfoam F-300 is reported as follows: CC(2/1.5/50)130, i.e. 130 kPa (approx.13 metric tons/m²). This means that under maximum load, Finnfoam’s F-300 insulation will compress only 1.5% over 50 years.

     

    The short-term compressive strength is simply a feature and should not be used in designing. Designs should be based on the long-term compressive strength, which can be used to calculate the maximum weight the product can be loaded with in long-term use.

    Strength properties of Finnfoam:


    The lattice structure consisting of small cells throughout the entire panel makes Finnfoam an extremely sturdy material. In addition, each side of the panel is covered by a solid skin that increases the rigidity of the panel as it creates a sandwich structure. The surfaces with high tensile strength and the core material with high compressive strength are attached tightly to each other. The cell structure of Finnfoam does not have weak links, and there are now air channels or glue joints between the cells.

    Finnfoam's long-term compressive strength in the standard panels (F-200–F-500) is 90–210 kPa, depending on the type of panel. The corresponding short-term compressive strength ranges from 200 kPa to more than 500 kPa. We can also produce F-700 panels whose short-term compressive strength exceeds 700 kPa to order.

    The grades/strength classes of frost insulation products are listed below:

    F-200

    The short-term compressive strength of F-200 exceeds 200 kPa, i.e. 20,000 kg/m2 and the long-term compressive strength exceeds 90 kPa, i.e. approx. 9 t/m2. F-200 is intended for use as frost insulation and for insulating base floors in applications under load, but it can also be used for insulating walls and ceilings. F-200 is also excellently suited for use as a lightening material.

    F-300

    The short-term compressive strength of F-300 exceeds 300 kPa, i.e. 30,000 kg/m2 and the long-term compressive strength exceeds 130 kPa, i.e. approx. 13 t/m2. F-300 can be used for almost any application in detached houses. F-300 is also usually sufficient for frost protecting driveways and yards, where heavy traffic does not occur. F-300 is also sufficiently strong for installation under the foundations of lighter buildings, but F-400 or F-500 is generally used for heavier structures.

    F-400 

    The short-term compressive strength of F-400 exceeds 400 kPa, i.e. 40,000 kg/m2 and the long-term compressive strength exceeds 180 kPa, i.e. approx. 18 t/m2. F-400 is used in areas with heavy traffic, such as highways, streets, and the yards of truck terminals. F-400 is also used in parking lots where the insulation is not covered by a distributive layer of soil of at least 300 mm. F-400 is also generally used as a floor slab insulation in industrial facilities where the floor is regularly subjected to significant concentrated loads, such as trucks, forklift trucks, machinery, and high storage shelves.

    F-500  

    The short-term compressive strength of F-500 exceeds 500 kPa, i.e. 50,000 kg/m2 and the long-term compressive strength exceeds 210 kPa, i.e. approx. 21 t/m2. F-500 is used for applications in which high strength is required from the insulation, such as the frost protection of railways. F-500 is also used for the floors of industrial facilities with high pallet shelves or heavy machinery.

    F-600 and F-700 

    These are specialty products, which are available on order. These products are used for floors in industrial facilities, for example. Railways rated for higher than usual axle loads also utilize these extremely sturdy insulation products.

    Home (EN)

    FINNFOAM OY
    Satamakatu 5
    24100 Salo, Finland
    Tel +358 2 777 300