Uses of Boron. 1  Much boron is made into sodium tetraborate which is used to insulate fiberglass. 2  It is also used in many cleaning products-detergents and bleaches. 3  Most boron is used to produce glass and ceramics. It is also used in many cleaning products-detergents and bleaches. 2  Most boron is used to produce glass and ceramics. 3  Borosilicate glass has a fantastic resistance to thermal shock (sudden changes in temperature which causes glass to break).