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hard rubber

noun

  1. rubber vulcanized with a large amount of sulfur, usually 25–35 percent, to render it stiff and comparatively inflexible.


hard rubber

noun

  1. a hard fairly inelastic material made by vulcanizing natural rubber See vulcanite


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Word History and Origins

Origin of hard rubber1

First recorded in 1855–60

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Example Sentences

We put an extra foot of height in the basement ceiling, we’ll put a bathroom down there, and you create a true home gym with a hard rubber floor and a mirrored wall and a ballet bar for bar classes.

From Time

Cutting boards come in three major categories: wood (including bamboo), plastic, and hard rubber.

In a fork of this arm hangs a round, black, trumpet-shaped, hard rubber tube.

They are made in wood and in hard rubber, the latter being most durable; their uses are so obvious as to require no explanation.

Drawing squares or T squares, as they are termed, are made of wood, of hard rubber and of steel.

This consists, in its essentials, of a hard rubber disc provided with a copper or brass segment.

The hard rubber being a non-conductor of electricity, prevents the flow of the current at all other times.

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hard row to hoehards