The phrase "duty rubber" refers to a type of rubber that is strong and made to withstand tough or heavy use.
Sentences with «duty rubber»
These sandals were made with heavy duty rubber so they are suitable for bringing with you on a dive trip. (kapalselam.org)
In the rear bed there is a functional heavy duty rubber mat that covers the cargo area to prevent paint scratches and chipping. (classicandperformancecar.com)
Mix well with a wooden spoon or a heavy - duty rubber spatula (the mixture will feel a little tough!) (thebusybaker.ca)