Jennifer:

Allow me to ask why you are interested, and where you have the potential for
contamination by Sodium Silicate.

Sodium Silicate is a very common ingredient in water based alkaline (read
this as high pH) detergents, and is commonly used as an anti-tarnish,
anti-corrosion agent in these detergents.  Most machine dishwashing compounds
have sodium silicate in them.

It can cause problems if the pH of the cleaner gets too low, as it always
does in a rinse.  It can also cause problems in high water hardness, where it
reacts with the water hardness, and falls out of solution as typically
Calcium Silicate.

And even if you have enough water softener in the detergent to overcome the
hardness in the cleaner itself, in the rinse you can still generate Calcium
Silicate.

My recommendation is to avoid Sodium Silicate in general, unless you have a
well formulated product with enough water softeners, and a good,
non-recirculating rinse.

Rudy Sedlak
RD Chemical Company

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