Answer:

butyl

Answer	Crossword Clue
BUTYL	Kind of alcohol
BUTYL	Synthetic rubber used in inner tubes
BUTYL	Synthetic rubber used in footballs

BUTYL	Type of rubber
BUTYL	Rubber used in inner tubes
BUTYL	Modern substitute for rubber.
BUTYL	Synthetic rubber.
BUTYL	Industry's answer to a rubber shortage.
BUTYL	Synthetic rubber
BUTYL	... alcohol
BUTYL	Tear-resistant synthetic rubber

BUTYL	Rubber used for inner tubes