Description: 1. Long stable tap hole length > 1/3 2. Low consumption at plugging 3. Improve campaign efficiency and prolong the service life of BF 4. No moist mixture or yellow fumes when tapping iron, Benzopyrene<5PPM . 5. High heat resistance and erosion resistance Stemming is one kinds of refractory material used for block the tap hole,it is divided into enhydrous Stemming and anhydrous stemming . 1.Enhydrous stemming used for low pressure,low degree of intensive smelting for small and medium blast-furnace. 2.Anhydrous stemming used for high pressure,high degree of intensive smelting for medium and big blast-furnace.