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窓のプラスチック部品の劣化
太陽の熱や紫外線に曝される窓は、外壁や屋根と同様過酷な環境に長い間耐えています。その為、国産のサッシ・メーカーは、出来るだけ消耗が少ないアルミを使って窓を作った訳ですが、断熱性や耐火性の問題でアルミと樹脂の複合材を用いたり、雨戸を追加したりする対策を打ち出しました。そんな中、断熱性の高い輸入樹脂サッシの技術を導入しながら、防火認定をクリアしたのが、クレトイシの窓...
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