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The Clue

Synthetic rubber bases (8 letter answer)

The Answer

STYRENES

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Notes

The answer STYRENES is so rare that it appears less than once every 2500 puzzles.

Related Clues

Hydrocarbons used in making plastics

Definition

STYRENE as a noun:

1. (styrene, cinnamene, phenylethylene, vinylbenzene) = a colorless oily liquid; the monomer for polystyrene