Several reasons Sodium silicate is a white powder that is readily soluble in water, producing an alkaline <http://en.wikipedia.org/wiki/Alkaline> solution. It is one of a number of related compounds which include sodium orthosilicate<http://en.wikipedia.org/wiki/Orthosilicate>, Na4SiO4, sodium pyrosilicate<http://en.wikipedia.org/w/index.php?title=Pyrosilicate&action=edit&redlink=1>, Na6Si2O7, and others. All are glassy <http://en.wikipedia.org/wiki/Glassy>, colourless and dissolve in water.
Sodium silicate is stable in neutral <http://en.wikipedia.org/wiki/PH> and alkaline <http://en.wikipedia.org/wiki/Alkaline> solutions<http://en.wikipedia.org/wiki/Solution>. In acidic <http://en.wikipedia.org/wiki/Acidic> solutions, the silicate<http://en.wikipedia.org/wiki/Silicate>ion reacts with hydrogen ions to form silicic acid <http://en.wikipedia.org/wiki/Silicic_acid>, which when heated and roasted forms silica gel <http://en.wikipedia.org/wiki/Silica_gel>, a hard, glassy substance. The absence in the US of mandatory aging tests, whereby PFP systems are made to undergo system performance tests *after* the aging and humidity exposures, are at the root of the continued availability, in North America<http://en.wikipedia.org/wiki/North_America>, of PFP products that can become inoperable within weeks of installation. Norm On Wed, Oct 31, 2012 at 6:08 AM, [email protected] <[email protected]>wrote: > Stops up drops and heads. It will collect in low points also and cause > obstruction. > > Sent from my HTC EVO 4G LTE exclusively from Sprint > > ----- Reply message ----- > From: "JSM Fire Pro" <[email protected]> > To: <[email protected]> > Subject: Sodium Silicate > Date: Tue, Oct 30, 2012 11:48 PM > > > Why does NFPA 13 not permit this additive for fire sprinkler systems? > > Thanks in advance. > > J. Scott Mitchell, PE > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20121031/6d0f685f/attachment.html > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > -- *If You See Something Suspicious.... Say Something! 1-866-HLS-TIPS.* Norman Arendt, CHS III, CMAS, PhD, CFEII President Infragard Madison Members Alliance Middleton Fire District Plan Reviewer and Investigator PCII and CVI Certified -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20121031/4c02f53e/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
