The exothermic-insulating riser sleeves burn and generate heat through the exothermic agent after contacting the molten metal, meanwhile it can also insulate the heat, which can extensively prolong the solidification time of molten metal and effectively feed to the casting. Therefore a smaller riser sleeve can well feed up the casting, thus improve the casting yield and reduce cost. Jinan Shengquan Group Share Holding Co., Ltd., as a leading producer and supplier of foundry materials in China, always supplies to customers products with excellent performance and stable quality. In the market of exothermic-insulating riser sleeves, we can supply riser sleeves of various types, specifications. In addition, special customization is also available according to customer needs.