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<p>Fire propagation through penetration and joint regions remains a critical vulnerability in fire compartments of high-rise and large-scale buildings, necessitating the development of sealing materials that simultaneously ensure fire resistance and long-term durability. A high-performance modified silicone sealant incorporating silica aerogel and nanographene flakes was systematically evaluated with respect to its flame retardancy, thermal stability, and fire resistance performance. To mitigate the mechanical deterioration commonly associated with high loadings of inorganic flame retardants, surface modification strategies were introduced, including atmospheric-pressure plasma treatment of silica aerogel and silane emulsion immersion of nanographene flakes, thereby enhancing interfacial compatibility with the polymer matrix. Experimental results demonstrated that the hybrid formulation achieved the highest UL-94 vertical burning classification (V-0) and retained over 85% of its initial tensile strength after accelerated thermal aging at 200&#xa0;°C for four weeks, indicating robust thermal durability. Fire resistance tests conducted in accordance with KS F 2845 confirmed that both integrity and insulation criteria were simultaneously satisfied for more than 60&#xa0;min. The enhanced performance is attributed to the synergistic effects of a multi-scale physical barrier formed by nanocomposites and the suppression of heat transfer enabled by the nanoporous structure of silica aerogel. These findings highlight the potential of the proposed hybrid sealant system as an effective solution for advanced fire protection applications in building envelopes and compartmentation systems.</p>

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A Hybrid Modified Silicone Sealant for Firestop Linear Joints: Toward Fire-Resistant Sealing Integrated with Architectural Finishes

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月7日

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  • Do Su Yoon,
  • Kee Sun Park,
  • Sumin Kim

摘要

Fire propagation through penetration and joint regions remains a critical vulnerability in fire compartments of high-rise and large-scale buildings, necessitating the development of sealing materials that simultaneously ensure fire resistance and long-term durability. A high-performance modified silicone sealant incorporating silica aerogel and nanographene flakes was systematically evaluated with respect to its flame retardancy, thermal stability, and fire resistance performance. To mitigate the mechanical deterioration commonly associated with high loadings of inorganic flame retardants, surface modification strategies were introduced, including atmospheric-pressure plasma treatment of silica aerogel and silane emulsion immersion of nanographene flakes, thereby enhancing interfacial compatibility with the polymer matrix. Experimental results demonstrated that the hybrid formulation achieved the highest UL-94 vertical burning classification (V-0) and retained over 85% of its initial tensile strength after accelerated thermal aging at 200 °C for four weeks, indicating robust thermal durability. Fire resistance tests conducted in accordance with KS F 2845 confirmed that both integrity and insulation criteria were simultaneously satisfied for more than 60 min. The enhanced performance is attributed to the synergistic effects of a multi-scale physical barrier formed by nanocomposites and the suppression of heat transfer enabled by the nanoporous structure of silica aerogel. These findings highlight the potential of the proposed hybrid sealant system as an effective solution for advanced fire protection applications in building envelopes and compartmentation systems.