Ivor and Olive Lewis on mon 13 aug 07
Dear John Sankey,
When you say your slip is made from Sodium Silicate and Clay, is this =
raw, pure, undiluted Sodium silicate or is it a solution of a small =
proportion of Sodium Silicate, say 1 or 2 per cent, in water ?
There is a difference and as we are told, understanding the Science is =
Raw liquid Sodium Silicate is an adhesive in its own right. It dries to =
give a strong bond.
In contrast, water is converted into a deflocculant solution when a =
small proportion of liquid Sodium Silicate is mixed into it. A mixture =
of about 15% of this solution and 85% dry clay will make a fluid that =
has a flow rate similar to that of "Single Cream". I would estimate the =
Specific Gravity on the hydrometer would read about 1.100 but it may =
be higher or lower. I have never measured the slips I use to attach =