Cross-linked polymers available to pre-industrial people?

Cross-linked polymers are vitally important materials used all the time in modern life. For example, the resins used in composite materials are usually some type of cross-linked polymer. What type of cross-linked polymers could be made by people with access to pre-industrial technology? The only one I can think of would be ebonite, made by heating natural rubber with sulfur.

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Cross-linked polymers available to pre-industrial people?

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