Grade: S40W/D, S60W/D, S80W/D The solid content of wet type marked with W is about 15%. Product Description: Expanded microsphere is a kind of hollow spherical plastic particles. The products can be use as light fillers because of low density. It made by expandable microsphere with Sinnos proprietary technology. Application: Leather repair, automotive repair of atomic dust, unsaturated polyester, epoxy casting and printing ink.