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Cq High Quality High Fever Exothermic Insulating Feeder Riser HD Sleeves. High Exothermic Property: Ensures efficient feeding and reduces defects in casting processes. Low Density Design: Provides excellent insulation while maintaining structural integrity. OEM Service Available: Customized shapes and specifications accepted for specific needs. ISO9001 Certified: Complete QC system ensures chemical and physical property standards. Versatile Application: Suitable for refractory, metallurgy, casting, and foundry industries. Improved Casting Yield: Enhances casting density and reduces cleaning and repair work. R&D Support: Dedicated team assists in new product development and innovation.