Appendix G: Zinc Chromate Primer

The Green Zinc Chromate Primer maybe an important clue.

There are numerous photos and reports concerning the presence of lime-green pieces of metal inside and outside the Pentagon on or shortly after September 11, 2001. 
 

History of Zinc Chromate Primer

In the aircraft industry of the 1940s, zinc chromate was used as an anti-corrosive barrier primer.  Back then as well as in the paint industry of today, the term zinc chromate does not refer to a paint color, but rather a protective coating.  Therefore, the precise coloring of it is and has not been considered as important as the chemical composition.  This means that the actual color of zinc chromate may have varied.

The native tone of zinc chromate crystalline salt is a bright yellow-green.  In US aircraft use in the 1920s and 1943s, the zinc chromate primer was frequently used in the raw mixture yellow tone.  This is sometimes referred to as “zinc chromate yellow” or “un-tinted primer”.  It was used extensively the US metal aircraft production during the 1920s and 1930s.  War years brought increased use of tinted primers, clear lacquers or simply bare metal interiors.

“Tinted primers” refer to the practice of zinc chromate being mixed with “lamp black paste” to give a more UV resistance and more durability in high wear areas.  Mixing with black gave greener tones.  In September 1943, US Navy and later Army Air Force specified a zinc chromate and lamp black mixture to a color standard, which became a standard ANA 611 “interior green”.  This was used later on many aircraft types.

Boeing Procedures on Zinc Chromate Primer

From research by “CatHerder”, of AboveTopSecret.com/forum, September 11th, 2004.

Now, let us examine the primer.  This excerpt is from a meeting of the South Coast Air Quality Management District. From a board meeting dated on November 8, 1996…

Proposed amendments will extend the compliance dates for several types of adhesive bonding primers, fuel–tank coatings, solid–film lubricants and primer coatings from 1997 to either 1998, 2000 or 2002 because compliant coatings have not been qualified by all major aerospace companies.  In addition, the VOC limits are proposed to be decreased for dry lubricative coatings. [i]

So, this hearing was held in 1996.  The date that the aircraft low VOC primer rule would go into effect was to be changed from 1997 to a later year.  Note that N644AA had already been built and was flying while these hearings were in progress. 

Transformation of Boeing primers.

In response to South Coast Air Quality Management District’s tightening of Rule 1124, Boeing looked to qualify a low-VOC (<350 g/L as mixed) primer to BMS 10-79, Urethane Compatible, Corrosion Resistant Primer.  Results:

 
In July of 2000, after much research, Boeing Materials Technology (BMT) qualified Dexter Aerospace’s 10P20-44 low-VOC primer system to the BMS 10-79 specification.  The “-44” primer system has been in use for several years at Boeing paint hangars as an exterior decorative primer (as qualified to BMS 10-72 Exterior Decorative paint System).[ii]

What does this all mean?

The lime-green paint, Dexter Aerospace’s 10P20-44 was qualified as a low-VOC primer system by Boeing Materials Technology in July 2000.  Previously, Boeing used dark green primer until July 2000 when it switched to the new lime-green low VOC paint.

N644AA, the alleged Pentagon plane, was built in 1991, which is nine years before that lime-green exterior paint entered general usage as a primer at Boeing!  How is it that a Boeing 757 plane built in 1991 using dark-green primer is reduced to a few small pieces of metal coated with lime-green primer?  

Boeing uses the same yellow primer and the same green primer on almost every single part of every single 757 and 767 built.  The lime-green paint primer came into use on Boeing aircraft (14) fourteen months before the crash.

Just Recently, for environmental concerns, Boeing has changed to non-chromated primers.  This new Boeing primer is “Low VOC Non-Chromated BMS 5-42 (Yellow)”.

In conclusion, Flight 77 is alleged to have taken place aboard aircraft #N644AA which was delivered in May 1991.  The plane was made (9) nine years and (2) two months before lime-green paint primer was qualified for use by Boeing.  Does the lime-green debris clearly demonstrate that this debris from the Pentagon is not 757 # N644AA?