Thirdly, they can seize.

Cartridges for incandescent lamps distinguish between ceramic and thermoplastic. Ceramic electropathones serve, according to manufacturers, longer than thermoplastic, but at the same time are not devoid of a mass of objective disadvantages. Firstly, the price. It is several times higher than the market value of thermoplastic configurations. Secondly, such ceramic cartridges are often soldered to the base of the lamp. Thirdly, they can seize.