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Cresol-Formaldehyde Resin for Wire Enamel, Jackson and Hall 1938
Cresol and formalin, with a little triethanolamine as catalyst, are boiled under reflux for about two hours until the resin starts to cloud out, dried under vacuum below 80 °C and thinned with cresol to a 50 % solution. GE's wire-enamel patent (Jackson and Hall, 1938) gives the recipe; heat later cures it hard.
The picture: our diagram of the cook.
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