discolor the surface grayish green to brown and cause rapid deterioration of electric surface resistivity.

Contamination

Contaminated ebonite was problematic when it was used for electronics. During manufacturing the ebonite was rolled between metal foil sheets, which were peeled off, leaving traces of metal behind. For electronic use the surface was ground to remove these metal particles.

Applications

Hard rubber was used in early 20th century bowling balls; however, it

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