The business of the North American Toy Fair, an annual showcase of the latest in silly putty, monster trucks and board games, is fun. But this year at the convention center in New York City, tariffs ...

Dimethacone is another name for PMDS, also known as polydimethylsiloxane, the primary ingredient in silly putty. PDMS is CH3[Si(CH3)2O]nSi(CH3)3, where n is the number of repeating monomer [SiO ...