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So I am aware that the eugenol in clove oil readily melts #6 type plastic (polystyrene). Polypropylene has a higher resistance, while HDPE type plastics seem to have the highest resistance.

My main question is whether the clove oil will interact with nylon. Say, the bristles of a toothbrush.

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    $\begingroup$ I would search for plastics/solvent resistence table, looking for aromatic hydrocarbons and their derivates. If eugenol is not used in pure form, it would be strongly affected by the composition of mixture. $\endgroup$
    – Poutnik
    Commented Dec 14, 2019 at 12:09

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Nylon 612, primarily used for filaments and toothbrushes, is resistant to clove oil at 20 °C [1, p. 2034]:

Screenshot of data from p. 2034 from Chemical Resistance of Thermoplastics

Nylon 12, used for coatings, is also resistant to clove oil at 20 °C [1, p. 1829]:

Screenshot of data from p. 1829 from Chemical Resistance of Thermoplastics

The tech data on nylon at newmantools.com also suggests there is no effect of clove oil on nylon in general.

References

  1. Chemical Resistance of Thermoplastics; Woishnis, W. A., Ebnesajjad, S., Eds.; PDL handbook series; William Andrew: Norwich, N.Y, 2012. ISBN 978-1-4557-7896-6.
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