UL FILE NO. E158033



FIW Technical Values

FIW Technical Values according to IEC 60317-56

FIW in general is an enamelled round copper wire, class 180, with a single coating based on polyurethane resin. That is why in general the specifications and Technical Data acc. to IEC 60317 for P. Leo Cat.#FIW (MW85-C) applies.Ul File number E158033.

However, due to the special demands on "solderable fully insulated zero defect" wire, some of the specifications exceed the previous range. The special technical values for FIW are specified in IEC 60317-0-7 and in IEC 60317-56 and compared with the typical values of P. Leo FIW on our IEC 60317-56 page. P.Leo FIW meets and exceeds the FIW requirements by IEC 60317-56.

FIW Technical Values according to IEC 60950 Annex U

Additionally there are some specific requirements regarding the test conditions for the FIW in IEC 60950 (Annex U) ,the standard for safety and information technology equipment. Typical results of P. Leo FIW as shown in the IEC 60950 Annex U page demonstrates that P.Leo FIW meets the requirements of IEC 60950 (Annex U) as well.

IEC62368-1 is the integration of IEC 60950-1 and IEC 60065 standard, was released in 2014.

Test parameter
Test method
Specification values for 0.30 mm FIW6
Typical values for 0.30 mm FIW6



Tensile strength



IEC 60 851-3.1

IEC 60 851-3.2

IEC 60 851-3.4.1


≥ 23%

not specified

not specified



310 N/mm²



at 390°C


IEC 60 851-4.5


≤ 4 sec


<3.0 sec

Thermal values

Temperature index

Heat shock

Cut through


IEC 60 172

IEC 60 851-

IEC 60 851-6.4


≥ 180°C

≥ 200°C

≥ 245°C



220/6mm mardrel


Breakdown voltage(cylinder)


V/μm at room temperature

at 180°C

(Volt per um increase of insulation)


IEC 60 851-

IEC 60 851-


min. 10 032V

min.76 V/μm

min.53 V/μm


> 15KV

> 100V/μm~



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