Polymers foams are widely used in a variety of applications, e.g. heat/water/air insulation, impact cushion, vibration absorption. Major foam materials are polyurethane (PU), polystyrene (PS), polyethylene (PE), polypropylene (PP), poly(vinyl chloride) (PVC), polycarbonate (PC); the order is roughly based on the amount of annual consumption.
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Keynote Vs vibration frequency
From vibrationdata.com, the following table lists vibration frequency for each piano keynote.
Continue reading “Keynote Vs vibration frequency”Foam compression set
Compression set is an important parameter to evaluate the foam’s permanent deflection which determines the long term performances,. e.g. sealing, isolation.
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