Andre Johann Strydom
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Andre Johann Strydom's Discussions

Darvan/dispersant & slip ..is that the need 4 non-Newtonian thixotropic character reversel in wheelwork.

Started this discussion. Last reply by Norm Stuart Aug 14. 1 Reply

We have a lot of recycled white slip waste offcuts which I have tried to get to a point through the pugmill to be able to do wheelwork .I have experimented with added Grogs and Kaolin.The big problem…Continue

Tags: #shear, #bentonite, #positve, #reversal, #dispers

 

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Norm Stuart replied to Andre Johann Strydom's discussion Darvan/dispersant & slip ..is that the need 4 non-Newtonian thixotropic character reversel in wheelwork.
"Darvan traps calcium and magnesium ions in clay and releases sodium ions in exchange To reverse this, you need to add calcium and or magnesium ions to exceed the Darvan level and flocculate the clay again. I use calcium chloride, used to melt ice.…"
Aug 14
Andre Johann Strydom posted a discussion

Darvan/dispersant & slip ..is that the need 4 non-Newtonian thixotropic character reversel in wheelwork.

We have a lot of recycled white slip waste offcuts which I have tried to get to a point through the pugmill to be able to do wheelwork .I have experimented with added Grogs and Kaolin.The big problem with the clay, which has been prepared for pouring ,firstly by adding Darvan/ dispersant. Makes a Great slip though! ...is that the non -Newtonian thixotropic character of this clay, because of earlier dispersant added creates a shear factor on the wheel which twists under pressure and is very…See More
Aug 13
Andre Johann Strydom is now a member of Electric Cone 6 & Other Ways w/ Clay
Aug 5

Profile Information

What is your experience with ceramics in general. (Long answer encouraged)
Some after school 1968 and holiday week classes in local Hermannsburg German community in KWA ZULU NATAL, PROVINCE of South Africa.
1 year course at BAFA University of KZN.
Continued as hobby only till...
2015 I got retrenched from a 9 to 5 Management post for 30 years..
NOW... seriously making a living and wheel throwing or pouring to mould making...etc.
I only AAA cone 6 !
What is your current involvement with electric fired ceramics? (long answer encouraged)
I have 4 barrel kilns of various sizes. Large to very small barrel test kiln. Firing in Celsius BISQUE 1020*c with 30 minute dwell.
CLAY USED: commercial white ceramic premix/blend powder "TERRADURA" The name says it. FineClay. FIRING Range from 1020*c to 1040*c .
HAVE TAKEN IT TO 1200*C noted some shrinkage and slight buff colour.
All our content is viewable by the public. Why do you want to be a member, when you can already see everything as a non-member?
I NEED TO NETWORK WITH OTHER POTTERS.. WE ARE VERY ISOLATED HERE.
Where do you work on your ceramics projects?
home studio
Do you have your own, or participate in other ceramics Websites:
http://www.firstlight.co.za
How did you find this network?
search engine

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Low cost flat lapping disc can be used on you potters wheel if you, drill bat pin holes in it, and provide a trickle of water to cool it. At amazon.com, 120 grit for aggressive material removal. Click the image to purchase 

Members have had great things to say about John Britt's new book, Mid-Range Glazes. Click the image to buy from Amazon.com

Purchase Glazes Cone 6 by Michael Bailey, The Potters Book of Glaze Recipes by Emmanuel Cooper, or Making Marks by Robin Hopper, all available at amazon.comMastering Cone 6 Glazes by John Hesselberth & Ron Roy is now out of print.

Harbor Freight is a great place to find unbeatable prices for better HVLP spray guns with stainless steel parts and serviceable economy models, as well as detail guns, all tested by our members for spraying glazes, as well as compressors to power the guns. As yet no one has tested and commented on the remarkably inexpensive air brushes at harbor freight.

The critter siphon gun is a spray alternative that is well liked by some of our members, and is available at amazon.

Amazon is also a competitive source for photo light tents for shooting professional quality pictures of your work. They also have the EZ Cube brand favored by several of our members. You might also want to purchase the book Photographing Arts, Crafts and Collectibles . . .

If you are up to creating videos of your work or techniques you might want to invest in a flip video camera

Following are a few scales useful for potters. Your final price could be less or more - things change.

American Weigh Black Blade Digital Scale, 1000g X 0.1g $11.08 

For the non-digitally inclined the old standard Ohaus Triple Pro Mechanical Triple Beam Balance, 2610g x 0.1g, with Tare $169.00

And finally a low cost clone of the OHaus. The Adam Equipment TBB2610T Triple Beam Mechanical Balance With Tare Beam $99.62

ebay is a great alternative for many tools and the equipment used in the ceramics studio - kilns, wheels, extruders, slab rollers are often listed there both new and used.

Tips for Members

If you just want to spout off, it is best accomplished as a blog posting. If you want to get more guidance and ideas from other members, ask a question as a new discussion topic. In the upper right corner of the lists for both types of posting, you will find an "+Add " button. Clicking it will open an editor where you create your posting. 4/16/2014

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