In the case of a transformer, the bobbin is a permanent container for the wire, acting to form the shape of the coil (and ease assembly of the windings into or onto the magnetic core). The bobbin may be made of nylon glass field 30% materials, 1st nylon RC28 garede white, naylon Black P.P.C.P. 3530 Ivory P.P.C.P. Second Black. This plastic often has to have a UL or other regulatory agency flammability rating for safety reasons.
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