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  • Less noise and vibration with foam
    is "crosslinked. " Crosslinking makes the foam more durable, flexible, and prolongs its life. Soft and pliable yet dense and strong, closed-cell foams seal and conform to irregular surfaces better than open-cell foams. A proprietary melamine-based foam called willtec serves as thermal insulation
  • Can you still see me now?
    An ultrasoft seal cushions delicate components and keeps dust from infiltrating displays in handheld electronics. Cell-phone designers rely on a range of urethane foams to seal and cushion delicate components from consumer abuse. Poron Soft Seal urethane foam (bottom) conforms around 0.3 mm corners
  • Polyurethane
    . This chapter discusses the cellular polyurethane materials. Polyurethane foams are thermoset materials that can be made soft and flexible or firm and rigid at equivalent densities. These foams, made from either polyester or polyether-type compounds, are strong, even at low density, and have good
  • Effects of Ultrasonics on Health
    each time the distance is doubled (i.e., every time the distance is doubled, 1/8 of the energy remains). The ultrasonic airborne energy is also absorbed into soft, non-reflecting materials (e.g., worker's clothing or noise abatement foam materials). The remaining airborne ultrasonic energy

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