Expandable microsphere is a kind of thermoplastic hollow polymer sphere, which is composed of a thermoplastic polymer shell and sealed liquid alkane gas. When the microspheres are heated, the shell becomes soft, and the internal air pressure increases sharply, causing the microspheres to expand, and the volume increases to 80 to 100 times.
The density of the expanded microspheres can be less than 30 kg/m3 (0.03 g/cm3), making it an ideal lightweight filler and foaming agent for plastics and rubber.
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