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Dishwasher etching
Water Quality Answers
What causes etching of my glassware in the dishwasher?
It is caused by the strong phosphate sequesterants (e.g., trisodium phosphate) in dishwashing detergent. It may also be triggered by the combination of extremely hot water, soft water, and too much detergent.
The high water temperature can cause the detergent phosphate compounds to break down into an even more aggressive form. If hardness is available, it will consume the most aggressive of these sequestering chemicals. Otherwise, however, the detergent agents can actually extract elements directly from the glassware composition. The solution to etching is to use less detergent and water temperatures less than 140oF when you have soft water. Water softening is such an enhancement that the dishes will get cleaned just as well with less detergent and 120o - 140oF water in softened water.
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Sat, Jul 31, 2010
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Water Quality Association
International Headquarters & Laboratory
4151 Naperville Road
Lisle, IL 60532-3696
USA
630 505 0160, Fax 630 505 9637
info@wqa.org, www.wqa.org
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