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What does it mean to be impact and explosion tested?

April 26, 2017explosion impact mean tested

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What does it mean to be impact and explosion tested?

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All UL classified insulated record protection equipment must pass the explosion test. For this test, the sample is prepared in the same manner as for the two previous tests. The test furnace is left empty and heated to 2000°F. The testers quickly open the door and insert the sample. For 30 minutes (20 minutes for units rated ½ hour), the furnace is kept at 2000°F. If no explosion takes place, the sample remains in the furnace until it cools sufficiently to handle.