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hard rubber ['hɑ:d'rʌbə]
chem.	guma twarda; ebonit m
English thesaurus
hard rubber ['hɑ:d'rʌbə]
metrol.	Hard rubber is generally suitable for use within the temperature range 0 °C to 90 °C. It has excellent abrasion resistance against small particles and good chemical resistance, particularly to leaching agents, acid and alkalis