Phenolic medium base light socket is made of phenolic resin. This plastic material is known for its resistance to heat, strength, and non-conductive characteristics. In the early days of lamp holder, a material called Bakelite was used to manufacture these led sockets. In fact, Bakelite was the name of the Phenolic socket. We have a great selection of Phenolic socket, Perfect for led incandescent lamps, our range includes, E27 phenolic socket, plastic lamp holder and much more.