Llewellyn Kouba on thu 17 nov 05
Clayarters:
Will Cone 6 Porcelain (Polar) be vitrified high enough to use for oil
lamps and holding that kind of liquid? and without adding another step
like adding wax or sealants to the inside when fired. Thanks in
advance. If so I will make a bunch.
Llewellyn
--
http://www.assumptionabbey.com/Pottery/index.html
Llewellyn Kouba
ABBEY POTTERY
Stoneware, Porcelain, Terra Cotta, and
Native Clays.
Assumption Abbey, Richardton ND USA
Mark Issenberg on thu 17 nov 05
i seal my cone 10 lamps with the sealer from Axner. I dont want the problems
that not sealing the lamps could be
Buy sealer and seal the lamps
Mark
mtigges@NOSPAM.SHAW.CA on thu 17 nov 05
On Thu, Nov 17, 2005 at 03:35:39PM -0700, Llewellyn Kouba wrote:
> Will Cone 6 Porcelain (Polar) be vitrified high enough to use for oil
> lamps and holding that kind of liquid? and without adding another step
> like adding wax or sealants to the inside when fired. Thanks in
> advance. If so I will make a bunch.
I haven't tried to contain oil ... but I am positive that you would
have no problem with Frost, the cone 6 porcelain from laguna.
John Hesselberth on fri 18 nov 05
On Nov 17, 2005, at 5:35 PM, Llewellyn Kouba wrote:
> Will Cone 6 Porcelain (Polar) be vitrified high enough to use for oil
> lamps and holding that kind of liquid? and without adding another step
> like adding wax or sealants to the inside when fired. Thanks in
> advance. If so I will make a bunch
Hi Llewellyn,
No one can answer this question with certainty except you. Oil is
very difficult to contain within a ceramic container--much more
difficult than water. The clay body must be very well vitrified and/
or the glaze must be absolutely flawless--preferably both. A small
difference of half a cone might make the difference between leaking
and non-leaking oil lamps. So please test this yourself--sitting an
oil lamp filled with oil on a piece of newspaper for a month or two
should tell you--and be sure to carefully control each firing if you
decide to make them. Although I know some make oil lamps with success
I also know of several potters (including me years ago) who gave up
making them because of leaking ones being returned by a customer.
Regards,
John
Mary K on fri 18 nov 05
Hi all, Llewellyn, and John,
This isn't quite on target,not being Cone 6, but I thought my experience might help a little. I made porcelain hanging "oil" lamps several years ago, and they are tight, and useful.No Leaks! They are cone 10, with several different glazes, including soda, and celadon. My forms are enclosed, with just a hole for the wick, and unglazed inside. The question I address is the use of oil. I fill mine with liquid parafin, and they burn beautifully, and have gotten us through 5 hurricanes in the past 2 years. I use the fiber glass wicks that you can buy in long rolls and trim to fit each lamp. with glass or porcelain wick holders, and all of them worked very well. The usual precautions about keeping the wicks trimmed is applicable. As soon as we hear the dreaded news, "tropical depression" on the tube, I haul out the lamps, and hang them throughout the house. As long as the clay is vitrified, at whatever cone it is rated for.....I can't see a problem. That's my
experience, hope it helps.( I have pictures if anyone wants to see them)
Mary K
Still picking up yard debris and re-planting....but the sun is shining and the day is glorious
John Hesselberth wrote: On Nov 17, 2005, at 5:35 PM, Llewellyn Kouba wrote:
> Will Cone 6 Porcelain (Polar) be vitrified high enough to use for oil
> lamps and holding that kind of liquid? and without adding another step
> like adding wax or sealants to the inside when fired. Thanks in
> advance. If so I will make a bunch
Hi Llewellyn,
No one can answer this question with certainty except you. Oil is
very difficult to contain within a ceramic container--much more
difficult than water. The clay body must be very well vitrified and/
or the glaze must be absolutely flawless--preferably both. A small
difference of half a cone might make the difference between leaking
and non-leaking oil lamps. So please test this yourself--sitting an
oil lamp filled with oil on a piece of newspaper for a month or two
should tell you--and be sure to carefully control each firing if you
decide to make them. Although I know some make oil lamps with success
I also know of several potters (including me years ago) who gave up
making them because of leaking ones being returned by a customer.
Regards,
John
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mtigges@NOSPAM.SHAW.CA on fri 18 nov 05
On Fri, Nov 18, 2005 at 09:27:19AM -0500, John Hesselberth wrote:
> On Nov 17, 2005, at 5:35 PM, Llewellyn Kouba wrote:
>
> >Will Cone 6 Porcelain (Polar) be vitrified high enough to use for oil
> >lamps and holding that kind of liquid? and without adding another step
> >like adding wax or sealants to the inside when fired. Thanks in
> >advance. If so I will make a bunch
>
> Hi Llewellyn,
>
> No one can answer this question with certainty except you. Oil is
> very difficult to contain within a ceramic container--much more
> difficult than water. The clay body must be very well vitrified and/
> or the glaze must be absolutely flawless--preferably both. A small
> difference of half a cone might make the difference between leaking
> and non-leaking oil lamps. So please test this yourself--sitting an
> oil lamp filled with oil on a piece of newspaper for a month or two
> should tell you--and be sure to carefully control each firing if you
> decide to make them. Although I know some make oil lamps with success
> I also know of several potters (including me years ago) who gave up
> making them because of leaking ones being returned by a customer.
>
I answered L Koubas question earlier in a rather carefree manner.
Clearly there is more to oil lamps than I was aware. I'm glad I've
learned something new again. But I'll restate my previous assertion.
Frost is amazing. If I don't have wash on my shelves, it adheres
itself to the shelf at cone 6 as if it were glaze. It looks and feels
just like glass.
Mark.
Llewellyn Kouba on fri 18 nov 05
Hi! John,
Thanks much for the good advise and the warning. Although I have made
Oil Lamps here without any problems in the past they were porcelain
fired to cone 9-10 range. Although once I remember not glazing the
inside of one of them and of course this just happened to have been the
one that ended up going all the way to England with a good friend of
ours. I offered to replace it but she said she liked it just the same
and that she would just use it as a decorative piece. I think I will
shy away from them altogether with cone 6 just to be on the safe side
and save them for my cone 9 -10 range.
Llewellyn Kouba
John Hesselberth wrote:
> On Nov 17, 2005, at 5:35 PM, Llewellyn Kouba wrote:
>
>> Will Cone 6 Porcelain (Polar) be vitrified high enough to use for oil
>> lamps and holding that kind of liquid? and without adding another step
>> like adding wax or sealants to the inside when fired. Thanks in
>> advance. If so I will make a bunch
>
>
> Hi Llewellyn,
>
> No one can answer this question with certainty except you. Oil is
> very difficult to contain within a ceramic container--much more
> difficult than water. The clay body must be very well vitrified and/
> or the glaze must be absolutely flawless--preferably both. A small
> difference of half a cone might make the difference between leaking
> and non-leaking oil lamps. So please test this yourself--sitting an
> oil lamp filled with oil on a piece of newspaper for a month or two
> should tell you--and be sure to carefully control each firing if you
> decide to make them. Although I know some make oil lamps with success
> I also know of several potters (including me years ago) who gave up
> making them because of leaking ones being returned by a customer.
>
> Regards,
>
> John
>
> ______________________________________________________________________________
>
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>
--
http://www.assumptionabbey.com/Pottery/index.html
Llewellyn Kouba
ABBEY POTTERY
Stoneware, Porcelain, Terra Cotta, and
Native Clays.
Assumption Abbey, Richardton ND USA
John Hesselberth on fri 18 nov 05
On Nov 18, 2005, at 8:31 PM, Llewellyn Kouba wrote:
> I think I will
> shy away from them altogether with cone 6 just to be on the safe side
> and save them for my cone 9 -10 range.
Hi Llewellyn,
The issue is no different a 9/10. You can still have poorly vitrified
clay bodies there. The key is proper vitrification and that is just
as obtainable at 6 as it is at 10. But some clay bodies are not well
vitrified at their suggested firing temperature or range.
John
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