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What is the Limiting Oxygen Index (LOI) of PVC?

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in Basic Civil Engineering by (111k points)
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

The question was posed to me in class test.

My question is taken from PVC topic in section Materials for Construction of Basic Civil Engineering

1 Answer

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Best 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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