From UL 94, car interiors, railway…to aircraft,
Sekisui’s flame retardance technology is constantly advancing.

  • 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

      • GradeFlammability
        UL94HBFFlame retardant
        UL94HF-2Flame resistant
        UL94HF-1Flame resistant



    For flame retardant performance in various applications,
    there are different performance requirements depending on each standards and materials 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.

  • Features of Sekisui flame-retardant foam

    • Flame Retardant of Softlon FR-ND

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

        ◎: Certified; ○: Certified equivalent

    • Flame Retardant of Thermobreak

      List of Corresponding Standards

      • RegulationTest MethodMeasuring Thickness
        EN 45545-2EuropeISO 5658
        Flame Spread
        (burning temperature)
        ISO 5659
        Smoke density &
        ISO 5660
        Heat Release Rate (Thermal conductivity)25mm
        U.K.BS 476
        Part 6 & 7
        BS 6853
        Annex B2
        BS 6853 Annex B2
        (Smoke toxicity)
        NFPA 130U.S.ASTM E162ASTM E162
        (Smoke density)
        ASTM E662ASTM E662
        (Smoke toxicity)
        PRIIABBS 7239BSS 7239
        (Smoke toxicity)

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

    There are two methods for making plastic materials flame retardant:
    (1) Choosing flame retardant resin and (2) Adding a substance that provides flame retardance
    In the long history of Sekisui polyolefin foam, development has been continued with the intention of responding to the constantly growing needs for flame retardant materials.

    The above efforts have produced our globally accepted flame retardant products that conform to various standards including UL 94, FMVSS 302 governing the materials for vehicle interiors, and the fire retardance standards for railway vehicles that differ from country to country.

    Corresponding products

    • 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.

  • Email inquiries are accepted 24 hours a day, which will be responded to during business hours.