Best Storage Units for PVC Industry In order for the production to provide the desired process, raw material silos with a volume capacity of 5 to 30 m³ serve as storage for the purpose of storing and keeping the raw material material. Raw material storage silos are manufactured from black sheet and stainless material, and they are also assembled and designed by us. Dimensions and diameters are designed and manufactured according to the area to be established and the capacity of production. Vibro-motor of suitable power is used for easier evacuation of dense calcite materials in production.