core is a core having central notched hole of a diameter
which is less than the inside diameter of sleeve riser.
This notched hole acts as a connection between casting body
and the sleeve riser.
Though the hole diameter is much less than the sleeve inside
diameter, feeding of casting through this connection is
not affected and smaller diameter connection with the notch
helps in removing riser very easily during fettling operation.
Breaker cores are generally used in conjunction with blind
are manufacturers of breaker cores FOR BLIND SLEEVES FOR
DUCTILE AND CAST IRON