David Hewitt on tue 21 dec 04
Betsy,
I presume that Phil Rogers was using Hyplas 71. The nearest ball clay
that I know to this and which may be available to you is Kentucky Stone.
You can see the analyses that I have of these two materials on my web
site. Look under Pottery Techniques / 'Transporting' Recipes and scroll
down to a table comparing different Ball Clays.
I would imagine that with some small changes you would be able to use
this other ball clay. If you have a glaze calculation program this
should be easy to check out.
David
>In message , Betsy Levine writes
>>Hi all,
>>
>>I am beginning to test some ash glazes, and have been working with Phil
>>Rogers Ash Glaze book. A number of his interestinh recipes call for Hypla=
>>s
>>ball clay, which is an English ball clay readily avaiable in the UK. Does
>>anyone know of a source for it in the US (Northeast preferably), or a goo=
>>d
>>substitute?
>>
>>Thanks in advance,
>>Betsy Levine
>
--
David Hewitt
Web:- http://www.dhpot.demon.co.uk
philrogers on wed 22 dec 04
Betsy,
I'm sorry to be a bit late onto this one - I missed the original =
message.
Hypas71 is a Ball Clay with 69% Silica and 20% alumina. The iron content =
is just under 1%. There is also a titanium content of 1.7%. So, we have =
a high silica, pale burning ball clay. Looking at the analyses in my =
other book 'Salt Glazing' I can see that a ball clay called 'Foundry =
Hill' may well provide a suitable substitute. However, try any ball clay =
that comes somewhere near and you may find different but not necessarily =
inferior glazes that are a reflection of the materials you have to hand.
Phil Rogers.
Phil and Lynne Rogers,
Lower Cefn Faes,
RHAYADER.
Powys. LD6 5LT. UK.
Tel. (44) 0 1597 810 875.
email. philrogers@ntlworld.com
visit my website at - www.philrogerspottery.com
also at: http://www.puckergallery.com/rogers.html
and : http://www.artistic.ws/phil-rogers.html
also: =
http://www.scarvapottery.com/Exhibition/default.asp?itemId=3D42&artist=3D=
9
and: www.studiopottery.co.uk
Betsy Levine on wed 22 dec 04
Thanks Phil, Steve, David, Mark and everyone who responded to my question
regarding Hyplas71.
I found some Kentucky Stone, so I have tried that. Haven't fired it yet. I
will take a look for the Foundry Hill, and see how that looks, too. Just
beginning to experiment here. Thanks for the encouragement. Will let you
know if anything whorthwhile turns out!
Betsy
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