When the first human ancestors threw an animal hide or dried plant over their shoulders and realized it kept them warm.
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The person that invented insulation was John Player. This was the standard type of insulation, and it was invented by him in 1893.
Original insulation was invented in 1893. The individual who invented it was John Player. Fiberglass insulation wasn't invented until 1897.
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Refractory insulation is defined as insulation for extremely high temperatures. The threshold of temperature of insulation for refractory insulation is > 815 Celsius.
Insulation resistance test: This test is used to find the insulation resistance of motor for 1 min or 10 min through high voltage insulation tester. By this we can find the insulation level. Polarization index: This is the ratio between insulation resistance for 10 min to insulation resistance for 1 min.