methanal is an example of
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Methanal (formaldehyde) reacts with phenol, carbamide (urea) and melamine to form three of the most important thermosetting plastics (resins). Sometimes, the resins are called PF (phenol-formaldehyde), UF (urea-formaldehyde) and MF (melamine-formaldehyde). The processes are all examples of condensation polymerization.
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