Hi
I have three questions :

1- IS there any standard about enamel wire storage situations (temperature, humidity , ...) ?

2- If we store enamel wire in a high humidity place for a week or more, is the quality of enamel wire reduced ? spesially does BDV accure in this during time?

3- how long is enamel wire shelf life?

Best regards

I will give you a little answer.
The key point is the viscosity of the enamel. It must be checked periodically.
If you have varnish with high solid content, it's necessary to storage this varnish in warm wharehouse to guarantee the viscosity properties.
In the box it's written the expiring day of the varninsh.
Thanks

Excuse me

My mean was magnet wire. Not enameling wire. however thanks for your answer. If Possibe guide me for above questions about megnet wire.

Thanks

The shelf life of the finished wire can be quite long. There are some motors that were insulated years ago and they are still running.

When you have an unopened container of enamel it should have a fairly long shelf life. Your enamel supplier can answer this question. Normally you would not or should not purchase any more enamel than you would be able to use within a couple of weeks.

Again if the enamel is in it's original container as received from the supplier, storing it for several weeks or even months should not be a problem. Even if you have removed some enamel and then tightly closed the container, it should be ok for a while.

If you are storing it in an open container, the solvents will evaporate - rate of evaporation depends upon solvent and ambient temperature. If stored in open container, then you have to worry about the enamel , if hygroscopic, adsorbing water from the humidity in the air.

Shelf life for the enameled wire should be near infinite. There are thermosets and thermoplastic coatings. Once a thermoset is cured it doesn't change. Thermoplastics in some cases may continue curing while in the warehouse. There used to be some thermoplastics that were used to insulate wire used in oil filled transformers. Once in the transformer and its filled with oil, it didn't matter if the wire continued to cure.

hello Richard

thanks for your answer my mean was if we stor magnet wire in a high humidity place for at least 2 weeks or more. is it possible the quality of magnet wire (spesilly VBD) Reduced dramatically. we faced with this Problem three mounths ago.

thanks

Nima,
Sometimes meanings get lost in translation. In the USA we normally say magnet wire which is wire that is wound and used in motors, coils, etc. and when current passes through the coil or winding it creates a magnetic force that caused a rotor in a motor to spin or a solenoid valve to either open or close.

In the UK they seldom say magnet wire but often say "winding wires" and even "covered conductor". Enameled wire or enameling wire is referring to wire that is going to be used as magnet wire or winding wire.

So magnet wire = winding wire = enameled wire; they are all the same thing.