FRP, also known as epoxy resin, is an insulating material with high hardness and high insulation performance. Electron band theory states that electrons in solids are only allowed to exist in certain energy states, and these energy states can form separate energy bands. Electrons tend to occupy the energy band with the lowest energy first. The insulating valence band is the energy band with the highest energy that can be filled at absolute zero. The energy band above the valence band is called the conduction band. The energy band between the valence band and the conduction band The gap is called the energy gap.

Above absolute zero, the valence band electrons are excited to transition to the conduction band, becoming conduction band electrons, and leaving holes in the valence band. According to the energy band theory, the energy band filled with electrons or the empty energy band does not contribute to the conductance. The conductance only comes from the half-full energy band. The conduction band electrons and valence band holes are collectively called carriers. The metal conduction band is partially filled, so it has good conductivity. For semiconductors and insulating ladders, the insulating ladder is filled with valence bands at absolute zero, while the conduction band has no electrons.

FRP, also known as epoxy resin, is an insulating material with high hardness and high insulation performance. Electron band theory states that electrons in solids are only allowed to exist in certain energy states, and these energy states can form separate energy bands. Electrons tend to occupy the energy band with the lowest energy first. The insulating valence band is the energy band with the highest energy that can be filled at absolute zero. The energy band above the valence band is called the conduction band. The energy band between the valence band and the conduction band The gap is called the energy gap.

Above absolute zero, the valence band electrons are excited to transition to the conduction band, becoming conduction band electrons, and leaving holes in the valence band. According to the energy band theory, the energy band filled with electrons or the empty energy band does not contribute to the conductance. The conductance only comes from the half-full energy band. The conduction band electrons and valence band holes are collectively called carriers. The metal conduction band is partially filled, so it has good conductivity. For semiconductors and insulating ladders, the insulating ladder is filled with valence bands at absolute zero, while the conduction band has no electrons.