[Ferro List] Naturally Passivated

[Christopher Glasspool]

Paul,
You mis-understood me on this. I think from what I'm reading, and what Gary Maylon reports that the naturally passivated might not matter because the use of passivated might not matter, in other words. Did Martin ever have a problem when he didn't naturally have passivated the mesh? 
Gary Maylon is dissembling stucco for ASTM committee etc, over and over for thirty years and hasn't seen anything but intimate bonding between mesh and mortar. Contractors don't worry about a passivated mesh. If Garry had found evidence of some corruption or de-boning then an ASTM would of developed that prescribed treatment for stucco. My point on wondering whether zinc naturally passivated came from noting as Keith said that some entities order passivated metal, as they want to paint it (towers etc.), and if natural passivated girders was working well, why would anybody fool with a material that is now banned in Europe and considered about as toxic as it gets for U.S.A. Not one article said anything like, let sit for three months and then paint. Maybe a difference lies with the two types of passivating methods that one would be ok for cement but not painting?
When Martin tested did he have some samples not work next to some that did with the only difference being how old or shiny the mesh was? - chris


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