The material that electrons do not readily flow through in the electrical trade is classed an an insulator.
Anything that is classified as a conductor will allow the flow of electrons.
glass
glass
Electricity".insulatorInsulatorinsulatorCurrent
insulator
This would likely be an "insulator" as opposed to a conductor.
Conductors.
Anything that is classified as a conductor will allow the flow of electrons.
glass
glass
Resistance.
Electricity".insulatorInsulatorinsulatorCurrent
conductor
insulator
A material that has a high resistance to the flow of electrons is an insulator.
Generally speaking, a material that does not let electrons travel through it, a material that has a very high resistance to electron flow (electric current), is called an insulator.
This might be a fundamental description of a semiconductor material.