Light-weighting is an established global trend in a variety of industries and applications. It makes manufacturing products and living in our world easier. Conveniently, formulators can achieve light-weighting by adding specifically engineered fillers to their recipes. Such lightweight fillers can overcome challenges concerning product quality and functionality, especially in the construction sector. For building professionals lightweight fillers offer a great potential to support improvements in product properties, especially weight, and application procedures, which expands the comfort zone for people.