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The surface performance and gathering habits of the combined option of this fluorocarbon surfactant and salt n‐octyl sulfate were examined using surface tension meter and transmission electron microscopic lense. With its foam efficiency test, it might be seen that F‐3 showed relatively superb foam performance. The first foam elevation h0 was 70 mm, the 25% drainage time was 315 s, the extinguishing time was 28 s, and the burn‐back time was 720 s. This type of fire snuffing out agent had the possibility of fire security application.
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