1. Expancel® microspheres are small spherical plastic particles. The micropheres consist of a polymer shell encapsulating a gas. When heated, the inernal pressure from the gas increases and the thermoplastic shell softens, resulting in a dramatic increase of the volume of the microspheres.The gas remains inside the sphere.
2. Highly controlled foaming.
3. Closed, uniform cell structure.
4. Guards against water penetration.
5. Create internal pressure to combat .shrinkage.