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Expandable microspheres are hollow polymeric spheres each of which comprises a thermoplastic shell encapsulating liquid hydrocarbon. When heated to a temperature high enough to soften the shell, the increasing pressure of the hydrocarbon will cause the microsphere to expand, increasing the sphere volume by 80 to 100 times. Aqueous, dry and masterbatch microspheres are offered.


The expandable microspheres are used, among other things, as a physical blowing agent and as an ultra-lightweight filler for density and weight reduction in a wide range of applications. Their use can reduce costs, modify surfaces and increase thermal insulation.

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Alexander Sielmann


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