deflocculant

In particular, soda ash absorbs water (up to 7% after one year, 11% after two years) and will thereafter no longer be effective as a slip deflocculant; and plaster will not set correctly after damp storage.

6. Obtaining glaze materials 1993

First the run-through time for slip without deflocculants is found and then the deflocculant solution is added to the slip 5 ml at a time.

7. Slip casting 1991

After developing a suitable body, the right amount of deflocculant is found by doing a simple test.

7. Slip casting 1991

Normally a point a little to the left of this is used, since it is important to use as little deflocculant as possible. trial batch

7. Slip casting 1991

A line is drawn between the dots, and from this graph the amount of deflocculant with lowest viscosity is read.

7. Slip casting 1991

Now prepare a 10-kg test batch of casting body following the standard procedure and using the amount of deflocculant found from our funnel test.

7. Slip casting 1991

What we want to find is the amount of deflocculant producing the most fluid slip.

7. Slip casting 1991

Old soda ash absorbs water from the air and becomes soda bicarbonate, which will no longer work as a deflocculant.

7. Slip casting 1991

So each 1 ml of solution added to 1 kg body means an addition of 0.01 % deflocculant.

7. Slip casting 1991

Initially, the slip will run faster with increase of deflocculant, but as the concentration of deflocculant increases, the slip will become less fluid.

7. Slip casting 1991