Abstract: A method of insulating a cathode ray tube and an electrical insulator composition for a cathode ray tube enabling an electrical insulator to be produced without material loss and enabling improvement of the bonding strength between a stem and a stem base and the insulation property between stem pins, when attaching to a stem, which is provided at the cathode ray tube and has a tip and stem pins projecting therefrom, an insulating stem base, which comprises a base through which pin through holes are formed and has provided projecting from the front surface thereof a tip holder, in a state with the stem pins inserted through the pin through holes and the tip held in the tip holder, said method comprising the steps of molding an electrical insulator composition comprising an uncured self-adhesive silicone rubber into a predetermined sheet shape by using a transfer mold to obtain an electrical insulator, arranging the electrical insulator in a state extending from the positions of the pin through holes on the bac

Abstract: An electrical insulator, provided between a stem of a cathode-ray tube and a stem base mounted to the stem is arranged, for insulating stem pins erected on the stem from each other, thereby improving the dielectric strength between the stem pins and a cathode-ray tube on which the electric insulator is mounted. The electrical insulator includes a fixed portion held between the stem and the stem base, and a projecting portion to be caught in a tip-containing portion of the stem base, the projecting portion being formed integrally with the fixed portion, wherein the fixed portion is provided with pin containing portions for containing the stem pins to be insulated by forming notches in the fixed portion on the outer edge side.

Abstract: A method of insulating a cathode ray tube and enabling an electrical insulator to be produced without material loss and enabling improvement of the bonding strength between a stem and a stem base, which comprises a base through which pin through holes are formed and has provided projecting from the front surface thereof a tip holder, in a state with the stem pins inserted through the pin through holes and the tip held in the tip holder, said method comprising the steps of molding an electrical insulator composition comprising an uncured self-adhesive silicone rubber into a predetermined sheet shape by using a transfer mold to obtain an electrical insulator, arranging the electrical insulator in a state extending from the positions of the pin through holes on the back of the base of the stem base to the tip holder and adhering it to the back of the base, folding the portion of the electrical insulator extending to the tip holder to the inside surface of the tip holder, and attaching the stem base to the stem.