標準編號:	GB/T 17650.2-1998
中文名稱:	取自電纜或光纜的材料燃燒時釋出氣體的試驗方法 第2部分:用測量pH值和電導率來測定氣體的酸度
英文名稱:	Test on gases evolved during combustion of materials from cables - Part 2: Determination of degree of acidity of gases by measuring pH and conductivity
中標分類:	K13    電纜及其附件
行業分類:	GB    國家標準
ICS分類:	29.060.01 29.060.01    電線和電纜綜合 29.060.01
發布機構:	中華人民共和國國家質量監督檢驗檢疫總局
發布日期:	1998-1-2
實施日期:	1999-10-1
標準狀態:	superseded
被新標準替代:	GB/T 17650.2-2021 取自電纜或光纜的材料燃燒時釋出氣體的試驗方法 第2部分：酸度（用pH測量）和電導率的測定
被替代日期:	2021-11-1
翻譯語言:	英文
文件格式:	PDF
中文字符數:	6000 字
翻譯價格(元):	360.0
交付時間:	付款后 1 個工作日

1 Scope Part 2 of this standard specifies a method for the determination of the degree of acidity of gases evolved during the combustion of compounds taken from the components of electric or optical cables. Note 1: The relevant cable standard should indicate which components of the cable should be tested, and which method of calculation (see clause 8) should be used in the case of dispute. Note 2: For the purposes of this standard the term “electric cable” covers all insulated metallic conductor cables used for the conveyance of energy or signals. 2 Principle of the Method A pre-determined quantity of the test material is burned in a tube furnace. The evolved gases are trapped by bubbling through bottles filled with distilled or demineralized water. The acidity is measured by determination of pH value. The conductivity of the solution is also measured. 3 Test Apparatus The principle diagram of the apparatus is shown in Figures 1 to 5. The assembly of the components which constitute the test apparatus shall be leak-tight. The connections between the tube and the first wash bottle and between the first and the second wash bottle shall be as short as possible. 3.1 Tube furnace The effective length of the heating zone of the furnace shall be 500 mm to 600 mm and its inside diameter 40 mm to 60 mm. It shall be equipped with an adjusted electric heating system. ? 3.2 Tube The furnace contains a fireproof tube made of silica resistant to the action of corrosive gases. The tube shall be approximately concentric to the tube furnace. The inside diameter of the silica tube shall be within the limits of 32 mm to 45 mm. The initial clearance shall only allow for thermal expansion. The tube protrudes on each side by a length L of: — on the entrance side: 60 mm ≤ L ≤ 200 mm; — on the exit side: 60 mm ≤ L ≤ 100 mm. 3.3 Combustion boats

1 Scope 2 Principle of the Method 3 Test Apparatus 4 Conditioning of the Samples 5 Test Pieces 6 Test Procedure 7 Determination of the pH Value and Conductivity 8 Expression of the Results 9 Recommended Values