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Old 10th Jan 2019, 11:22 pm   #1
yesnaby
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Default Stove Enamelling

Does anyone know of anywhere that does stove enamelling? I have some obsolete grill and oven parts for a cooker that were finished in 'polar white'. Lots of places can do powder coating but I don't think that will withstand the temperatures reached without discolouring.
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Old 11th Jan 2019, 3:43 am   #2
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Default Re: Stove Enamelling

True stove enameling is glass frit sprayed onto metal then fired so it melts and flows.
There are still some firms re-enameling cast iron baths, heaven knows why, but they may help.
Beware, some refinishers think any spray finish on a bath is stove enamel, wrong.
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Old 11th Jan 2019, 7:36 am   #3
John M0GLN
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Default Re: Stove Enamelling

I got a cooker hob stove enameled a few years ago by Trico who did an excellent job.

http://www.trico-ve.co.uk/contract-enamelling/

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Old 11th Jan 2019, 8:50 am   #4
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Default Re: Stove Enamelling

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Originally Posted by John M0GLN View Post
Trico who did an excellent job.
Yes, the original makers of vitreous enamel signs. That sounds like a good idea.

I've recently taken delivery of some custom-made reproduction enamel signs from Trico and I am very impressed by what they can do.
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Old 11th Jan 2019, 12:51 pm   #5
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Default Re: Stove Enamelling

That sounds interesting! I have a Tilley searchlight which needs enamelling.

However, it has some parts of the fuel tank soldered together. Does anyone know how hot stove enamelling is stoved at? I don't want a beautiful enamel finish on a set of parts in kit form!
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Old 11th Jan 2019, 1:53 pm   #6
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Default Re: Stove Enamelling

Too hot for solder, glass melting temperature.
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Old 11th Jan 2019, 2:01 pm   #7
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Default Re: Stove Enamelling

I don't know about this particular case, but some (not all) fuel tanks in spirit burners etc. were silver soldered as a safety measure lest leaking fuel should catch fire. Mind you I doubt even silver solder could stand up to the temperatures needed to melt glass.
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Old 11th Jan 2019, 2:38 pm   #8
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Default Re: Stove Enamelling

Glass starts melting at 800 centigrade upwards, enamel paint is higher.
If suitable paint was available and the shelves would fit in the kiln, I could fire it all, the kiln goes to 1300C.
Most solder for fusing metal will start creeping at 200C, been there, done that.
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Old 11th Jan 2019, 3:38 pm   #9
David G4EBT
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Default Re: Stove Enamelling

Quote:
Originally Posted by yesnaby View Post
Does anyone know of anywhere that does stove enamelling? I have some obsolete grill and oven parts for a cooker that were finished in 'polar white'. Lots of places can do powder coating but I don't think that will withstand the temperatures reached without discolouring.
An internet search will reveal many companies who will do stove enamelling and powder coating, but the price is likely to be prohibitive.

It's worth outlining the differences between the three main processes:

Stove enamelling:

In case there's any doubt, 'stove enamelling' doesn't mean 'enamelling for stoves' - 'stoving' is the term for the curing process in an oven at 120 degrees C (248 F), of paint sprayed onto steel with the same sort of spray gun used to spray a car in a garage. Some stove enamelling paints are two-part, but as with cellulose paint, for safety and environmental reasons, have tended to fall out of favour.

Not sure what temperature it will withstand, but presumably at least 120C, and probably more.

Powder Coating:

The powdered paint is electrostatically charged and sprayed onto the part. The part is then placed in an oven where the powder particles melt to form a continuous hard wearing film. The oven is more expensive than a stove enamelling oven because it has to heat the component to a higher temperature - about 200 degrees Celsius (392F). The spray guns are quite different from a paint spraying gun and cost thousands of pounds.

Used extensively for alloy car wheels.

Again, I don't know what upper temperature limit it will withstand, but presumably at least 200C.

Vitreous Enamel:

The key ingredient of vitreous enamel (also called 'porcelain enamel'), is finely ground glass called frit. It's applied by a spray gun, then fired in an oven at between 750 and 850 C (1,380 and 1,560 F) to fuse the powdered glass. The powder melts, flows, and then hardens to a smooth, durable vitreous finish. Typical uses are for such things as AGA style cookers, and it was used extensively on gas and electric cooker hobs, splash-backs , doors and side panels, and cast iron baths. Though durable and able to withstand heat, it's main disadvantage, being glass, is that it chips easily if struck by a hard object and can't be satisfactorily repaired. It's a process that's been known about for thousands of years, often used for jewellery.

Hope that's of interest.
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Old 11th Jan 2019, 3:56 pm   #10
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Default Re: Stove Enamelling

Powder coating can withstand extreme temperatures but may become tacky at higher temps.
2k paint can withstand engine cylinder temps without a problem (upto 300C).
Teflon may be a good solution but it's unknown if it's made in any other colour except grey.
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Old 11th Jan 2019, 4:01 pm   #11
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Default Re: Stove Enamelling

Thanks for the explanation of the methods David, my post should have said that I had my hob Vitreous Enameled, there's certainly a significant difference.

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Old 11th Jan 2019, 8:54 pm   #12
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Default Re: Stove Enamelling

There were methods for repairing vitreous enamel that used an RF generator and hand held heating coil.
It did a great job on repairing the coatings on domestic appliances that had been damaged during production.

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Old 12th Jan 2019, 6:07 pm   #13
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Default Re: Stove Enamelling

Thanks for the overview of the different techniques David! Very helpful!
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Old 14th Jan 2019, 10:45 pm   #14
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Default Re: Stove Enamelling

Many thanks for the replies and advice, I'm going to search a bit more to see if the parts are really obsolete. If they are I might try Trico as suggested but I fear it will cost too much!

Michael
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