The Olefins segment manufactures and markets ethylene, polyethylene, styrene and associated co-products.

FORBES: #1,487 Westlake Chemical

He discovered that if he coated pipes with a common polymer called styrene maleic anhydride, he could kill bacteria lurking in the water supply.

FORBES: Are Men Ready for a Contraception Injection?

Finishing things off: 2 millimeters of lining leather, Vibram rubber soles, a steel shank, a leather heel counter and a styrene toe box to harden the front and prevent nasty stubs.

FORBES: Entrepreneurs