Market leading and proprietary Sekisui flame retardant foam technology for electronics, constructions, railway,
aerospace and other fields.

  • Electronics Fields

    Flame-retardant technology required for foam

    Comparison of Performance in a U94 Flammability Test and
    Test Setup Illustration

    • Solid Plastic Materials

      • GradeFlammability
        UL94HBFlame retardant
        UL94V-2Flame resistant
        UL94V-1Flame resistant
        UL94V-0Flame resistant
        UL945VBFlame resistant
        UL945VAFlame resistant



    • Foaming Materials

      • Flame Retardant of Softlon FR-ND

        GradeCombustion Test Method
        UL94 HF-1FMVSS 302Railway Vehicles
        # 3003
        # 3004◎ Flame resistance
        # 3005◎ Flame resistance

        ◎:Certified ○:Certified equivalent

    For flame retardant performance in various applications,
    there are different performance requirements depending on the standard and material used, as well as the applications.

    Today, materials used near people or objects are often required to be flame retardant or non-combustible.
    The requests for flame retardance and non-combustible have given birth to unique flame retardance standards for specific purposes or markets.

    For example, the UL standards, the product safety standards developed by Underwriters Laboratories Inc. contain UL94 regarding the measurement of the flammability of plastic,which is used as typical guidelines in most industries.

    Softlon FR-ND passes UL94 HF-1 flammability requirements for electronics. Softlon FR-ND is used for a wide range of applications including thermal insulation for air-conditioning and cushioning for printers.
    Soflton FR-ND passes FMVSS302 flammability requirements for automotive. Soflton FR-ND is used for cushioning in automotive electric devices and thermal insulation for automotive HVAC systems and bodies.

    Corresponding Products

  • Construction & Railway Fields

      Turning things from flammable to non-flammable:
      Sekisui’s constantly improved foam has been chosen in construction & railway industries.

      Cooling and heating systems are important to buildings and mass transit vehicles for comfort.
      Thermal insulation plays a major role to significantly reduce energy costs of cooling and heating systems.
      Thermobreak is an innovative insulation material designed for the building and mass transportation industries. Thermobreak contributes to energy efficiency and passenger comfort and has been used in buildings and mass transit vehicles for over 30 years.
      Thermobreak LS-FMP is a new addition to Thermobreak product range and is certified for the Japanese fire and smoke standard for building by The Ministry of Land, Infrastructure, Transport and Tourism in 2020. Thermobreak RT meets the globally recognized railway fire and smoke requirements.

      THERMOBREAK-RT Fire and Smoke Rating

      EU & Asia

      Standards EN 45545-2

      This is the railway fire and smoke standard in EU which unified the national standards of EU member counties. After EU introduced EN 45545-2 standard, railway projects in Asia regions (India, China, ASEAN and the Middle East) also adapted to this standard.
      Thermobreak RT complies with HL3 rating.

      • Test MethodTested Thickness /Result
        ISO 5658 Part 2Flame Spreadt5mm ~ t100mm HL3 Rating
        ISO 5659 Part 2Smoke Density & Smoke Toxicityt5mm ~ t100mm HL3 Rating
        ISO 5660 Part 1Heat Release Ratet5mm ~ t100mm HL3 Rating

      The USA, Canada and Asia

      Standards NFPA 130

      NFPA 130 is fire and smoke safety standard of The National Fire Protection Association. It is adapted to railway industries in the USA and Canada. Some railway projects in Asia (Taiwan and ASEAN) are also based on the NFPA 130.
      Thermobreak RT complies with NFPA 130.

      • Test MethodTested Thickness /Result
        ASTM E162Surface Flammabilityt5mm ~ t25mm
        ASTM E662Smoke Densityt5mm ~ t25mm

      Standards PRIIA

      PRIIA (Passenger Rail Investment and Improvement Act of 2008) is the railway safety act adapted to railway projects in the USA.
      Thermobreak RT complies with PRIIA.

      • Test MethodTested Thickness /Result
        ASTM E1354Heat Release Ratet5mm ~ t25mm
        BSS 7239Smoke Toxicityt5mm ~ t25mm

      Global THERMOBREAK Website

      Global THERMOBREAK Website

      Corresponding Products


    • Aerospace Fields

      • Newly developed Softlon LHR satisfies the typical require standards for aircraft interiors.

        • Required PerformanceTest MethodSoftlon LHR
          Low heat generationFAR25.853(d)App.FPart IVPass
          Vertical combustion for 60 secondsFAR25.853(a)App.FPart IPass
          Vertical combustion for 12 secondsFAR25.853(a)App.FPart IPass
          Smoke densityFAR25.853(a)App.FPart VPass

          ※below 9mm thikness

      Challenge of developing products to reach aircraft standards:
      Flame retardance is not enough. A new feature, low heat release foam has come into view.

      In response to the growth of the global economy and population in developing countries, the number of aircraft in operation will continue to increase. In addition, aircraft are the fruit of a variety of advanced technologies, requiring ultimate performance from each piece of material.

      Aircraft materials are controlled under strict standards against fire, smoke, and toxicity, which are collectively referred to as “FST performance.” Moreover, aircraft interiors require special properties, including low heat release during combustion.

      With continued development toward satisfying these strict standards, Sekisui has succeeded in producing world’s highest level of low-heat release foam from polyolefin foam.
      While seeking early applications of our products as shock absorbers and thermal insulators for the seats, walls and ceilings, and galleys in aircraft, we are also planning to building and construction fields.



    Foam Division High performance plastics company

    • We do not sell retail to the general consumer.

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