Ivan Kminek
Muse
- Joined
- Jun 15, 2011
- Messages
- 906
we are talking about them doing it back in 1967.......how is it so high tech now?
electroplating works, yes. but what would the end result look like with those certain pigments and epoxy?
the funny thing is, i doubt it was used that much back then. maybe it was some experimental thing considering the laclede standard steel joist paint formula was dated sept 1, 1967.
from wiki-
The first patent for a cathodic EPD product was issued in 1965 and assigned to BASF AG. PPG Industries, Inc. was the first to introduce commercially cathodic EPD in 1970. The first cathodic EPD use in the automotive industry was in 1975.
the nist mention the pittsburgh plate glass company (PPG).
nist-
The shop paint was to be in accordance with Pittsburgh Plate Glass (PPG) Company Standard RF-2184
initial tank charging material with PPG red power primer RF-2184 replenishing material or Laclede
Standard Red Chromate Steel Primer, Specification LREP 10001.
was laclede doing experimental stuff perhaps?
Senenmut, I already mentioned that the electrocoating was a brand new technology in Golden Sixties. I read now on the web of PPG Industries (former Pittsburgh Plate Glass): "1963: Filled first electrocoat tank with anodic electrocoat for automobile bodies." And "1971: Filled the world's first cathodic electrocoat tank".
Therefore, I was very probably wrong in my initial guess that paint for WTC floor trusses was applied by cathodic process, it had to be the anodic process which was used. Anyway, this painting technology (electrocoating) was available in the middle of sixties and it is clear enough from NIST report NCSTAR 1-6b that WTC floor trusses were painted in this way. Why to have any doubts here? It is just silly. Or do you think that Laclede paint document in NIST report is some kind of fake?
The choice of pigments which can be used in the paint for electrocoating is very wide and it is written in the already cited patent http://www.patents.com/us-5324756.html : "Pigments that are used include titanium dioxide, carbon black, iron oxide, clay and the like." Therefore, iron oxide and aluminosilicates (e.g. clays) are of course pigments usable for electrocoating.
Fig. 9 (and Fig. 8) shows a picture which is compatible with the paint: small particles of iron oxide and larger particles of some aluminosilicate, probably kaolinite, "embedded in an unstructured matrix which gives a dark BSE intensity" (words of Harrit team describing polymer binder).
(I still think that the best way how to know more about electrocoating in sixties is to write an inquiry to PPG Industries, namely to electrocoating division, see http://www.ppg.com/coatings/electrocoat/pages/default.aspx. I already wrote such inquiry but I made one stupid mistake: I explicitly mentioned 911 thermite conspiracy theory in my e-mail; therefore, no answer followed...)
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