Gas Displacement Method True Density Tester for the True Density of Expandable Microspheres
Expandable microspheres, small thermoplastic spheres encapsulated with gas, consist of a thermoplastic polymer shell and an encapsulated liquid alkane gas. When the microspheres are heated, the shell softens and the internal air pressure increases dramatically, causing the microspheres to expand dramatically to 60 times their original volume, giving them the dual function of a lightweight filler and a blowing agent. As a lightweight filler, expandable microspheres can greatly reduce the weight of products with very low density, and their density measurement is very important.