- rubber vulcanized with a large amount of sulfur, usually 25–35 percent, to render it stiff and comparatively inflexible.
Origin of hard rubber
Examples from the Web for hard rubber
Historical Examples of hard rubber
His hand clutched 12the hard-rubber receiver with white strength.
His hand reached upward and lifted the hard-rubber receiver from the hook.
He took one step forward as Loris swished across the sitting-room, lifted the hard-rubber receiver and voiced a soft, “Hello!”
We have, then, a glass or hard-rubber jar containing two lead plates and a solution consisting of water and sulphuric acid.ABC of Electricity
William Henry Meadowcroft
The touch key ended in a hard-rubber knob which could be brought in contact with the skin of the subject.
- a hard fairly inelastic material made by vulcanizing natural rubberSee vulcanite