[Clayart] Clayart Digest, Vol 77, Issue 3

Carolyn Curran cncpots2 at gmail.com
Sat Apr 2 14:29:18 UTC 2022


Thanks for more info, people.  I have looked into use of vermiculite and
perlite hazards. think I'm ok.  Carolyn

On Sat, Apr 2, 2022 at 8:01 AM <clayart-request at lists.clayartworld.com>
wrote:

> Send Clayart mailing list submissions to
>         clayart at lists.clayartworld.com
>
> To subscribe or unsubscribe via the World Wide Web, visit
>         https://lists.clayartworld.com/mailman/listinfo/clayart
> or, via email, send a message with subject or body 'help' to
>         clayart-request at lists.clayartworld.com
>
> You can reach the person managing the list at
>         clayart-owner at lists.clayartworld.com
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Clayart digest..."
>
>
> Today's Topics:
>
>    1. firing electric kilns (mel jacobson)
>    2. sawdust instead of straw in primitive kiln (Carolyn Curran)
>    3. Re: sawdust instead of straw in primitive kiln
>       (Edouard Bastarache)
>    4. SAWDUST (Mike Gordon)
>    5. Re: sawdust instead of straw in primitive kiln (Robert Harris)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 1 Apr 2022 17:44:39 +0200
> From: mel jacobson <melpots at mail.com>
> To: clay art <clayart at lists.clayartworld.com>
> Subject: [Clayart] firing electric kilns
> Message-ID:
>
> <trinity-e36c7efa-ae8e-405d-8c61-71eccac7ef4f-1648827879090 at 3c-app-mailcom-lxa09
> >
>
> Content-Type: text/plain; charset=UTF-8
>
> knowing and understanding your own kiln and having confidence
> in it is essential to perfectly fired pots.
>
> if your kiln is in order, it will fire in X time, to X cone.
> It should take almost the same time, over and over.  if it is lagging
> behind, then there is something wrong.  fix it.
>
> on the kiln sitter, there is a small timer. use it every time.  i set mine
> for
> about a half hour extra time.  so, my small kiln fires glaze in about 4.5
> hours.
> i set the timer for 5 hours.  then memorize..."there is no fail safe.
> only your own
> eyes". i do not leave my kilns running without me there. never.
>
> about every six or eight firings i clean with very fine emery paper the
> weight
> and claw. i clean the cone holder too.
>
> my newer big paragon kiln has a 220 low amp plug in on the side of the box.
> i have an extension cord from that plug to my studio. When the kiln is
> running
> that light is on.  i use a standard 220 light bulb. IF THE LIGHT IS ON,
> THE KILN IS ON.
>
> at hopkins high i had a 220 light bulb above my desk. Light is on, kiln is
> on.
> I could leave school and the janitor knew if that light was on...shut off
> the
> main power to the kilns.  It was a sure thing. my office lights are off,
> if that
> bulb was lit...something wrong.  if the janitor failed to turn things off,
> the
> janitorial department had to pay for repairs.  he cleaned my room every
> night at 6.
> we did not have problems.
>
> orton tells me that cones can age. so, don't use that box of cones from
> 1958.
>
> if you own a newish controller kiln it does not mean you can just walk
> away from the
> kiln.  remember, "planes crash".  kilns do not shut down properly all the
> time.
>
> safety cones work well. your eyes work well. being near the kiln works
> well.
>
> my large electric has a controller. it is screwed to a 4x4 post in the
> room. the 220
> box is next to it. i can switch during a firing from cone sitter to
> controller by
> unplugging and changing things. i pick the system i am going to use. and
> often put
> a cone in the sitter, and use the controller just to test things.
>
> I have a analog pyrometer on the kiln. there is a digital pyrometer on the
> shelf.
> I have a 60 amp breaker painted red. i have small fans running, and the
> kilns have
> their own room. go in and check, and get out.
>
> it is so easy to be safe, and have your brain plugged in too.
> mel
>
> website: www.melpots.com
> www.melpots.com/CLAYART.HTML
>
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 1 Apr 2022 13:11:44 -0400
> From: Carolyn Curran <cncpots2 at gmail.com>
> To: clayart at lists.clayartworld.com
> Subject: [Clayart] sawdust instead of straw in primitive kiln
> Message-ID:
>         <CA+u4nih0C+ckiM=
> 4aBXcADiDnqbH70YXgX0CKxi_t9SuhYj3VQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> My inarticulate bad.   Sorry I confused you.  I intended to add  sawdust
> IN  the clay body along with vermiculite or perlite and grog...sort of a
> paper clay situation, since straw and sawdust both  have cellulose.  I
> would probably wet it so there won't be particles flying through air.
> With my  COPD and chronic bronchitis,  I  don't think I'd play with a
> sawdust firing, although we have a trash can with holes here that was
> probably used in that way.  (Heck,  I only use   non toxic iiquid
> combustibles  for any raku..have a bottle of
> high test  Everclear booze for the purpose, use sparingly at bottom of
> combustion chamber..  I have had great success with the alcohol with small
> scale work in  old Aim test kiln with one vase almost 8" tall which was
> super unique in  subtle coloration. It is still a  big favorite.   Carolyn)
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> https://lists.clayartworld.com/pipermail/clayart/attachments/20220401/1258ce33/attachment.htm
> >
>
> ------------------------------
>
> Message: 3
> Date: Fri, 1 Apr 2022 15:22:53 -0400
> From: "Edouard Bastarache" <edouardb at colba.net>
> To: "'Clayart international pottery discussion forum'"
>         <clayart at lists.clayartworld.com>
> Subject: Re: [Clayart] sawdust instead of straw in primitive kiln
> Message-ID: <000201d845fd$e2c28170$a8478450$@net>
> Content-Type: text/plain;       charset="utf-8"
>
> Toxicity
> Much of vermiculite toxicity is associated with asbestos. According to the
> Centers For Disease Control, prolonged exposure to asbestos can lead to
> asbestosis, an inflammation of the chest cavity also known as pleurisy. It
> can also lead to lung cancer, recurrent pneumonia and an asbestos-related
> cancer known as malignant mesothelioma. The average time frame for
> asbestos-related lung conditions to occur is 20 to 40 years after the first
> exposure. By itself, vermiculite is not considered toxic, but the mineral
> does produce a dust that can cause asthma and allergies.
>
> Edouard
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 1 Apr 2022 13:06:15 -0700
> From: Mike Gordon <clayart at earthlink.net>
> To: Clayart international pottery discussion forum
>         <clayart at lists.clayartworld.com>
> Subject: [Clayart] SAWDUST
> Message-ID: <3A8B6B95-7E1B-49C0-8BED-21B225E0EAFC at earthlink.net>
> Content-Type: text/plain; charset=utf-8
>
> Most tree trimmer company?s will give you course saw dust for free. Mike
> Gordon
>
> ------------------------------
>
> Message: 5
> Date: Fri, 1 Apr 2022 22:01:13 -0600
> From: Robert Harris <robertgharris at gmail.com>
> To: Clayart international pottery discussion forum
>         <clayart at lists.clayartworld.com>
> Subject: Re: [Clayart] sawdust instead of straw in primitive kiln
> Message-ID:
>         <CAL12t+j3Ha=
> cFTqdLAh1O0ajnuhUEpkzk8tD2i8JOJo-eqjGuQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I've put sawdust in clay. Biggest problem is that it caused serious
> pinholing in the glazes. Otherwise it fired just fine.
> Obviously it depends how much you put in! (My aim was to produce a piece
> with enough air gaps that it would provide insulation for hot drinks,
> didn't really work).
>
> We also wad all of the posts in our kiln, even in a regular reduction
> firing, and we use sawdust (about 25-30% by weight which is probably >60%
> by volume), makes the wadding just crumble right off.
>
> Not sure what your aim is, by adding sawdust.
> The long fibers in paper help stabilise the clay, but sawdust won't provide
> that.
>
> On Fri, 1 Apr 2022 at 11:29, Carolyn Curran <cncpots2 at gmail.com> wrote:
>
> > My inarticulate bad.   Sorry I confused you.  I intended to add  sawdust
> > IN  the clay body along with vermiculite or perlite and grog...sort of a
> > paper clay situation, since straw and sawdust both  have cellulose.  I
> > would probably wet it so there won't be particles flying through air.
> > With my  COPD and chronic bronchitis,  I  don't think I'd play with a
> > sawdust firing, although we have a trash can with holes here that was
> > probably used in that way.  (Heck,  I only use   non toxic iiquid
> > combustibles  for any raku..have a bottle of
> > high test  Everclear booze for the purpose, use sparingly at bottom of
> > combustion chamber..  I have had great success with the alcohol with
> small
> > scale work in  old Aim test kiln with one vase almost 8" tall which was
> > super unique in  subtle coloration. It is still a  big favorite.
>  Carolyn)
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <
> >
> https://lists.clayartworld.com/pipermail/clayart/attachments/20220401/1258ce33/attachment.htm
> > >
> >
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> https://lists.clayartworld.com/pipermail/clayart/attachments/20220401/5381a2e4/attachment.htm
> >
>
> End of Clayart Digest, Vol 77, Issue 3
> **************************************
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clayartworld.com/pipermail/clayart/attachments/20220402/a895b825/attachment.htm>


More information about the Clayart mailing list