Crossword Genius

Rubbery-like gum common in dental cement and insulation (5-6)

Ross

I believe the answer is:

gutta-percha

(Other definitions for gutta-percha that I've seen before include "Rubber-like substance" , "Hard rubber-like latex" , "Substance like hard rubber" , "Rubber-like latex product" .)

I've seen this clue in the Sydney Morning Herald.
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