Aluminum silicate insulated core plug 1,High accuracy,good surface 2,Anti-erosion 3,good ... ,Tap out/hole cone manufacturer 2,Vacuum forming3,Aluminium silicate fiber 4,Smooth surface 5,Right Hardness for application Details: Aluminium ... Out Cone,also called insulated plug,insulated hat and insulated coreplug.Mainly made by senior aluminium silicate fiber and other formulas through ...