Evaluation of Flammability for Cable-like Polymers

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  • ケーブル状高分子物質の燃焼性評価
  • ケーブルジョウ コウブンシ ブッシツ ノ ネンショウセイ ヒョウカ

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For evaluating the flammability of cable-like polymers, a new test method was developed. In this method, the rate of downward flame spread along the polymer surface was measured by means of a moving wire technique, in which the flame was stopped on a special position by winding up the cable in the same speed with the flame spreading rate, under the external pre-heating by an electric furnace and the oxidative gas flow. The technique is convenient for making the polymer burn continuously without a change of flame condition, and the rate can be obtained from the winding speed of cable. <br>While, through a simple flame spread equation, the flame spreading rate of cable-like polymer V in such condition can be related to the oxygen concentration in atmosphere Y0, the pre-heating temperature Ta and the pyrolysis temperature for polymer burning Tp as<br>V = α · (Tp − Ta )-b · Y0n<br>Where b and n denote multipliers concerning the dependences of temperature and oxygen, respectively, and α denotes the geometrical factor of specimen. <br>Therefore, by plotting log V vs. log Y0 for experimental results, one may evaluate the flammability of polymers discriminating between the effects of oxygen concentration, heating temperature and specimen shape. <br>Results obtained by using various types of PVC electric cable showed that this method was valid as our expectation. Also, from the application of this method to “grouped cables”, it was found that they exhibited a peculiar behavior, which was different from the case of one cable, in the atmosphere of high oxygen concentration. Experimental results and discussions were given in the present paper. <br>In addition, this evaluation method may be applied to not only electric cables, but general polymeric materials if they can be formed like cables.

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