The Wham-O Super Ball is made of a Zectron, which contains the rubber polymer polybutadiene and sulfur.
"By combining polybutadiene with sulfur it was discovered by
the ball's inventor, Norman Stingley.
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Polybutadiene rubber.(PBR)
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The most common synthetic rubbers used in hybrid rocket motors
is HTPB (Hydroxyl-terminated polybutadiene).PBAN (Polybutadiene
acrylonitrile) is also a common rubber used as fuel.
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Combines the strenght and rigidity acrylonitrile and styrene
polymers with the toughness of polybutadiene rubber.
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The type of rubber used to make balls is called polybutadiene
rubber.