Answer:
Polyurethane foam
Explanation:
When two different materials are pressed or rubbed together, the surface of one material will generally steal some electrons from the surface of the other material. The material that steals electrons has the stronger affinity for negative charge of the two materials, and that surface will be negatively charged after the materials are separated. (Of course the other material will have an equal amount of positive charge.) If various insulating materials are pressed or rubbed together and then the amount and polarity of the charge on each surface is separately measured, a very reproducible pattern emerges. For insulators, the table below can be used to predict which will become positive v.s. negative and how strong the effect will be.
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