Dear Maya:
“
If you can help I would be most grateful.
”
Under the circumstances, I don't really think that I can help you, but if you want a response to your main question, the answer is no: there's no such an industry standard. That “industry standard” that your fabricator invokes is just a wishful figment of his imagination. Tell him to show it written somewhere by some credible industry institution; and if not, tell him to stop taking you for a ride and fix the problem.
One more example of why the world needs marblecleaning.org!
May I ask you now to please read and e-sign our Statement of Purpose at:
http://www.marblecleaning.org/purpose.htm?
Ciao and good luck,
Mauri
Article ID: 1187
Created On: Tue, Feb 12, 2008 at 1:05 PM
Last Updated On: Tue, Feb 12, 2008 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=1187