Expandable microspheres are microscopic spheres comprising a thermoplastic shell encapsulating a low-boiling-point liquid hydrocarbon. When heated to a temperature high enough to soften the thermoplastic shell, the increasing pressure of the hydrocarbon will cause the microsphere to expand.
Expandable microspheres are microscopic spheres comprising a thermoplastic shell encapsulating a low-boiling-point liquid hydrocarbon. When heated to a temperature high enough to soften the thermoplastic shell, the increasing pressure of the hydrocarbon will cause the microsphere to expand.
Source: Wikipedia "Expandable microsphere" · CC BY-SA 4.0
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