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Class 5.1. Oxidizing substances (agents) by yielding oxygen increase the risk and intensity of fire
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Class 5.1. Oxidizing substances (agents) by yielding oxygen increase the risk and intensity of fire
Oxidizing substances (agents) by yielding oxygen increase the risk and intensity of fire   Oxidizer (Division 5.1) means a material that may, generally by yielding oxygen, cause or enhance the combustion of other materials.

1. A solid material is classed as a Division 5.1 material if, when tested in accordance with the UN Manual of Tests and Criteria, its mean burning time is less than or equal to the burning time of a 3:7 potassium bromate/cellulose mixture.

2. A liquid material is classed as a Division 5.1 material if, when tested in accordance with the UN Manual of Tests and Criteria, it spontaneously ignites or its mean time for a pressure rise from 690 kPa to 2070 kPa gauge is less then the time of a 1:1 nitric acid (65 percent)/cellulose mixture.

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