Lot‐to‐lot variations in a phenol/cresol‐formaldehyde resin were fully characterized. Resin property‐product hardness relationships were examined to elucidate the cause of variable hardness in product insulators and to establish acceptance criteria for the resin. A high methylol content (ϕCH2OH), determined by quantitative carbon‐13 nuclear magnetic resonance (13C‐NMR), and a narrow molecular weight distribution (MWD), determined by size exclusion chromatography, were found necessary for resin to produce insulator meeting the minimum Shore D durometer specification of 40.
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