Which of the method cannot be used to determine fiber volume fractions?

Which of the method cannot be used to determine fiber volume fractions? Correct Answer Pultrusion

Pultrusion is a composite manufacturing technique while all others are the methods used for the determination of fiber volume fractions. Matrix digestion involves polymer matrix digestion using a strong acid specifically nitric acid. Ignition loss method involves igniting the matrix phase completely by keeping the fiber phase remaining. Polarized light is an important optical microscopy-based technique used for fiber volume fraction determination.
Bissoy MCQ

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