Materials that easily collect loose electrons include: teflon, silicon, vinyl (PVC), polyurethane, styrene (styrofoam), polyester, gold, brass, silver, copper, and hard rubber.[25].
Additionally, teflon, silicon, vinyl (PVC), polyurethane, styrene (styrofoam), polyester, gold, brass, silver, copper, and hard rubber all gather loose electrons easily.
Later, balls made of polyester and urethane were developed and in some cases replaced the hard rubber ball.
It must have been cast in some hard medium – hard rubber, in fact.
I pressed my fingertips into the hard rubber of the steering wheel.
The high areas are inked with a hard rubber or composition roller.
While the hard rubber that Reisman uses can last for years, sponge rubber has to be replaced every few months, if not more frequently.
"And that was with solid wooden pins and a hard rubber ball," he said.
Thirty years ago, most bowling balls were hard rubber or plastic.
It is called hard rubber because it is a modified version of soft rubber but not having the nature of soft rubber.
