UL近日宣布完成一項高度超過30英吋的人造聖誕樹的產品認證首例。 該項產品的評估標準,包括傳統的UL 588《季節性及節慶裝飾產品標準》(Standard for Seasonal Lighting Products),以及新的UL 2358《季節性產品耐火測試評估大綱》(Outline of Investigation for Fire Tests of Seasonal Use Products) 大型燃燒測試規範。

UL 2358第一版標準於2010年12月1日公佈。在經過實際的測試案例後, UL根據客戶對測試的回應,針對天然聖誕樹和人造聖誕樹的評估進行進一步研究,並於2013年8月28日發佈了UL 2358第二版標準。同年10月,UL召開產業會議,與業者分享研究結果,並說明標準修改的內容,最後終於在2014年3月正式發出認證首例。

UL 2358 標準的修訂,主要是根據UL針對不同火源對未經加工處理過(含有水份)的天然樹木、乾燥(未含有水份)的天然樹木,以及人造聖誕樹產生的影響所獲得的研究數據,結合先前人造樹提交評估在測試期間所收集到的數據。依據研究結果,大型燃燒測試仍將沿用20千瓦的火源進行測試,但在部分測試上則進行修改,修改重點如下:

  • 恆定的20千瓦火源曝曬修正為燃燒曝曬的增長與衰退。這項改變更加突顯火源在樹下燃燒時的真實狀態。
  • 燃燒曝曬 (點火源時間) 從原有的15分鐘修正為5分鐘。由於研究發現,天然和人造聖誕樹在前5分鐘對火焰的反應是最明顯的,且在大多數的案例中,測試結果跟前5分鐘的燃燒狀況完全有關係。
  • 測試樣品數量從5樣下修到3樣。由於研究找出了最嚴格的測試點,降低了測試樣品的需求。

認證首例的出現,象徵了製造商與UL一同追求產品安全的決心,唯有經過嚴格測試與持續的後續檢驗的產品,才能真正獲得市場信賴。

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