Here's how cenospheres can be used in riser sleeves and the potential benefits, cenospheres for riser sleeves, Cenosphere(Expanded Mineral Materials Containing Alumina and Silica) is a light weight, inert, hollow sphere made largely of silica and alumina and filled with air or inert gas., typically produced as a byproduct of coal  combustion at thermal power plants. The color varies from gray to almost white and their den sity is about 0.6–0.9 g/cm³, all these property give it a widely application for insulation,refractory,oil drilling,coating,construction use. Cenospheres In Heat-Insulating Refractory Concretes Microspheres, due to their fire resistance and high heat-insulating properties, are used in the production of thermal insulation materials. The high temperature of microsphere shell softening allows, with the appropriate selection of the binder, creating refractory coating and insulating materials for industrial equipment. Cenospheres Color: gray Particle size: Based on customer requirements Shape: hollow microspheres Material: glass, nontoxic, odorless, non corrosive Silica: 50% ~ 65% Alumina: 27% ~ 35% Fe2o3：2%~3% MgO: 0.8% ~ 1.2% Silica: 0.1% ~ 0.2% Cao: 0.2% ~ 0.4% MgO: 0.8% ~ 1.2% Potash: 0.5% ~ 1.1% Sodium oxide: 0.3% ~ 0.9% Fire resistance: ≥1610 ℃ Floating Rate:≥95% Moisture content:≤1% Our usually packing way： 25kg/pp bag or 500~600kg/ bag Usage : 1.Cementing: Oil Drilling Mud & Chemcials,Light Cement Boards,Other Cementious Mixes. 2.Plastics: All types of Moulding,Nylon,Low Density Poluethylene and Polypropylene. 3.Construction: Speciality Cements and Mortars,Roofing Materials.Acoustic Panels,Coatings. 4.Automobiles: Fabrication of composite polymeric putties. 5.Ceramics: Refratories,Tiles,Fire Bricks. 6.Paints and Coating: ink,bond,vehicle putty, insulating, antiseptic, fireproof paints. 7.Space or Military: explosives,invisible paints for planes,ships and even soldiers,heat and compression insulating compounds,deep-water submarine. Reduced Weight: Cenospheres are lightweight, which can help reduce the overall weight of the riser sleeve. This can be beneficial in applications where the weight of the riser needs to be minimized. Insulation: Cenospheres have good insulating properties. Adding them to the riser sleeve can help reduce heat loss from the molten metal, allowing it to stay molten longer and ensuring a more effective feeding of the casting as it solidifies. Controlled Cooling: The insulating properties of cenospheres can lead to controlled and gradual cooling of the molten metal within the riser sleeve. This controlled cooling can potentially reduce the formation of defects like hot tears and cracks in the casting. Shrinkage Compensation: Cenospheres can help compensate for solidification shrinkage by providing a source of molten metal as the casting cools. This can improve the overall quality of the casting by minimizing the likelihood of shrinkage-related defects. If you are looking for cenospheres, please feel free to contact us, we are a cenosphere manufacturer with 40+ years of experience. Stable Quality, Strict Quality Control, Delivery On Time! Welcome to contact us with your specific requirements, we are happy to help you!