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Home / News / Industry News / The difference between QA(UEW) and QZ enameled wire. Meaning of QA(UEW), QZ(PEW), QZY(EIW) in enameled wire

The difference between QA(UEW) and QZ enameled wire. Meaning of QA(UEW), QZ(PEW), QZY(EIW) in enameled wire

First let's take a look at QA(UEW),QZ(PEW),QZY(EIW)  when used in enameled wire.


UEW refers to polyurethane enameled wire, which is an English model and is specified by IEC

QA also short for Polyurethane enameled wire, the temperature resistance grade is generally 130/155/180, and its insulation layer has good direct solderability at 360 to 400 degrees. It is widely used in coils and motor windings.

QZ(PEW) short for polyester enameled wire, temperature grade is generally 130, 155, with good temperature stability and insulation properties.

QZY(EIW): polyester imine enameled wire, heat resistance index 180, good modified products can reach 200 in the general sense, generally compound polyamide-imide, as a primer of 200 lines, salt water pinhole is not ideal when single coating .


(a) It has good direct solderability and can avoid the action of peeling off the film during the winding process, which effectively improves work efficiency.

(b) At high frequencies, it has good ‘Q’ value (quality factor) characteristics

(c) It has good adhesion and winding properties.

(d) It has good solvent resistance to the solvents and hardeners commonly used for impregnating the varnish.

Application scope:

High frequency coils and transformers, relays, magnetizing coils, spiral coils, ignition coils.

QZ(PEW) polyester enameled wire characteristic:

(a) It has good anti-cracking properties, abrasion resistance, chemical resistance and temperature stability.

(b) Its physical properties such as windability, abrasion resistance and adhesion are superior to PVF wire.

Application scope:

Motors, micro motors, transformers.

QZ-1: Polyurethane; as for -1, it refers to the thickness of insulating varnish, 1 is thin, 2 is medium. QA is improved. In electronic energy-saving lamps, the first assessment index is the wire diameter and temperature grade of the enameled wire. The wire diameter is determined by the line current, and the temperature grade is determined by the actual temperature rise. The withstand voltage is not the  important evaluation index.