Themainfunction:  

1)Toplugthetaphole，thegunmudisrequiredtohavegoodfillingandsinteringproperties；  

2)Stabletapping，requiringeasy-openingofthetapholeandresistancetoerosionanderosion；  

3)Toprotectthehearth，itisrequiredthatthegunmudhasnocrackswhenitisheatedquickly，andthebondingstrengthofthenewandoldgunmudishigh；  

4)Thesheddingperformanceisgood，thesheddingmachinebitiseasytodrill；  

5)Moderateplasticity，whichisconvenientformudgunoperationandtheformationofironmouthmudpacks；  

6)Goodvolumestability，smallvolumechangeathightemperature，nomoltenironleakageduetoshrinkage.  

Advantages:  

1)Highstrength，andmaintainingthestabilityoftheblastfurnaceconditions(thedepthofthetaphole，fluctuationsinthetappingtime，therateoffullairclogging，etc.)isofgreatsignificance，sothattheblastfurnacehasabasisforincreasingproduction.  

2)Strongslagresistance.Theunitconsumptionofcannonmudislow，generallyone-fifthofwatercannonmud.  

3)Ithascertainexpansionproperties.Withproperporosityandstrength，itcanadapttomorethan2000m.Usedinlargeblastfurnaces.