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What is the approximate phenol formaldehyde ratio used is the preparation of casting grade phenolic resins?

What is the approximate phenol formaldehyde ratio used is the preparation of casting grade phenolic resins? Correct Answer 1:2.2

The casting grade phenolics are prepared from highly pure grades of phenol and formaldehyde using more than 2 moles of formaldehyde per mole of phenol and employing alkaline catalyst.

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