1.

What is the Limiting Oxygen Index (LOI) of PVC?(a) 45 or more(b) 20 or more(c) 45 or less(d) 20 or less

Answer» Correct answer is (a) 45 or more

Best explanation: Limiting Oxygen Index is a minimum concentration of oxygen that will support combustion of a polymer. It is expressed as a percentage.  PVC has good flame retardancy.  Air has 20% oxygen, PVC has LOI of 45% or more.


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