david clark on mon 20 sep 04
Does any one know where I can buy Dispex in the USA. I'm going crazy trying
to find it, it's not in Laguna catalog, bailey etc..
I believe the recipe I'm working with depends on it, AAAARRRGGGG.
Much thanks
David Clark
Brooklyn
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Jim Murphy on mon 20 sep 04
David,
I believe - here in the USA - you'll need to find "Darvan".
I suggest you request assistance at www.rtvanderbilt.com on which grade of
Darvan (7, 811 ??) to substitute for Dispex (grade ??) in your particular
recipe. [R.T. Vanderbilt produces Darvan.]
Best wishes,
Jim Murphy
Ivor and Olive Lewis on tue 21 sep 04
Dear Dave Clark,
Ask for Darvan 7.
It is another deflocculant with similar properties.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
David Clark on sun 26 sep 04
Yes according to Vanderbilt Darvan 811 is the stuff for slips. It is said
that .2-.4% is a good place to start. Half way through mixing my bone
china slip, during the bone ash, I had to add crazy amounts to make the
slip fluid enough to accept the bone ash. by the end of mixing everything
I will have used a quart of darvan 811. This was the case with darvam 7
as well. about 50 grams in a 75 lb batch will get it fluid again to add
more dry ingredients only to have is seize up again and accept no more
dry.then I would add more darvan 811
Of course this seems like too much to me but if it works then it works.
even if it's more that is said to be required. I am blunging the batch
now and I will see in the morning if it is in fact jelled beyond
usability. THis was the only way to get the dry ingredients mixed, I fear
that the batch is no good.
Is it that bone ash is the most difficult thing to mix into slip?
David
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