Unexpanded EXPANCEL® microspheres are used as blowing agents.
Unexpanded microspheres in PVC-plastisols offer important advantages over chemical blowing agents, such as controlled foaming at low temperatures, homogeneous cell structure and larger time/temperature areas where foaming can take place without the cell structure collapsing.
The cell structure is 100% closed.
In some polyurethane applications, EXPANCEL® microspheres are added to compensate for normal shrinkage.