---------- Forwarded Message ----------

From:   Michael P. Edison, 75251,2620
TO:     INTERNET:[log in to unmask], INTERNET:[log in to unmask]
DATE:   8/17/98 4:21 PM

RE:     Copy of: Re[2]: Latex Additives

Message from grace.crane:
>  Michael,  You say "We have been preparing cement-lime custom 
     mixtures...". Who is "we"? How does one go about asking the "we" for a

     particular mixture to match an historic mortar? I'm thinking that 
     historic mortars are what you are talking about. Of course, I could be

     as wrong as three left feet. <
     
Samples of mortars for custom matching can be sent to:
        Edison Coatings, Inc.
        25 Grant Street
        Waterbury, CT 06704
If you have available petrographic analysis information, or would like to
specify a particular mortar strength include this information with the
samples. Indicate the specific surface you wish to have matched for color
(clean cross-section, weathered face, etc.) If existing mortar will be
chemically cleaned, it is advised that you clean the samples with the same
chemicals and procedures before you send them.

>Also, I have to be concerned that the latex additive moisture release 
     tests were at near-saturation. I would not want my mortar to have to 
     go to near-saturation before the moisture was released. That would 
     permit too much moisture to stay to the inside of the building and not

     escape as it should, when it should. This would cause build-up of 
     molds and fungi and all sorts of pathogens, not a pleasant thought.  <

The assumption that the latex mortar has to be saturated before it releases
moisture is incorrect. The drying tests (which run from "saturated"
condition to "as dry as it's going to get under ambient conditions")  are
actually a series of data points that show initially large and then
decreasing rates of weight change. The shape of the curve is pretty much
the same for latex modified and unmodified mortars.

Mike Edison
Edison Coatings, Inc.
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800-697-8055