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dense slip for spikes


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#1 claclana

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Posted 04 December 2012 - 09:19 PM

Hello


I want to be able to make spikes as large as possible by squeezing them with slip (I suppose dense could be nice).
I would like to do the slip from the clay (cone 04) I am using, I have darvan 811 and sodium Silicate (to reduce water content-shrinkage/crackings) but I don't know what quantity should I use, the formulas I find are for too big batches.

Is there some possibility to do about 2 pounds of slip?
THANKS!


#2 bciskepottery

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Posted 04 December 2012 - 09:40 PM

Darvan will make the slip more fluid; you might want to use epson salt. Here's a good video that shows effects of using Darvan and epson salt.



#3 Marcia Selsor

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Posted 04 December 2012 - 10:30 PM

Darvan will make the slip more fluid; you might want to use epson salt. Here's a good video that shows effects of using Darvan and epson salt.

http://www.youtube.c...player_embedded


great video!
Marcia

#4 neilestrick

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Posted 05 December 2012 - 12:38 PM

Deflocculating with Darvan or sodium silicate will allow you to take a VERY thick slip with low water content and make it fluid enough to work with, therefore minimizing shrinkage. Flocculating with epsom salts will take a slip with a higher water content and higher shrinkage rate and make it thicker, but will not do anything to reduce shrinkage.

I would take a very thick, sludgy, non-fluid slip, like almost thick enough to form into a shape, and deflocculate it by eye. Mix equal parts water and deflocculant and and add it a couple drops at a time to your sludge until you get the viscosity you need.
Neil Estrick
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#5 Chantay

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Posted 05 December 2012 - 12:44 PM

This is a great video. Should explain what you need to do. - chantay



- chantay

#6 claclana

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Posted 05 December 2012 - 07:48 PM

GREAT!

I have the needed answer
Thanks!




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