Properties:C content ≥99.5% ,Ash content ≤0.3%, Size and shapes:as per the client requirement. Graphite crucible Sets which are composed of Graphite Crucible and ceramiccrucible.Graphite Crucible uses high purity and fine structure graphite as raw material whichhas low ash content(≤0.3%).Crucible seat:SiO2:50--80% MgO:5--7% Al2O3 10--15%. Size and shapes:as per the client requirement.