BS 476-20 Fire tests on building materials and structures – Part 20: Method for determination of the fire resistance of elements of construction (General principles) BS 476-20 對建築材料和結構的著火試驗 – 第20部分:建築材料耐火測試(一般原則)
BS 476-21 Fire test on building materials and structures – Part 21: Method for Determination of the fire resistance of load bearing elements of construction. BS 476-21 建築材料和構件的防火測試-第21部分:承重材料耐火性測試