Love trivia like that. Where does that info come from?
I did a quick search and see Guardian glass has had an in from the beginning of the reconstruction - starting in 2004
GUARDIAN INDUSTRIES CORP. PROVIDES ULTRAWHITE™ GLASS FOR WORLD TRADE CENTER #7
Viracon chooses Guardian as glass supplier for prestigious project
AUBURN HILLS, Mich., (Feb. 10, 2004) – One of the most significant reconstruction projects in United States history is well underway and Guardian Industries has earned a room with a view.
Guardian Industries, a leading worldwide manufacturer of float glass, is honored that its UltraWhite™ low-iron glass has been selected for use on New York City's World Trade Center Building #7 project. As many know, Building #7 was the third building to collapse following the terrorist attacks on the World Trade Center Complex on September 11, 2001."
“Our glass can be seen in many skylines and cityscapes across the globe, but there is no view as famous or familiar as the panoramic postcard of New York City,” says Russ Ebeid, president of Guardian’s Glass Group. “It is an honor for us to have been chosen to provide our UltraWhite glass for the World Trade Center #7 project.”
Viracon, the glass fabricator for the #7 project, chose Guardian’s UltraWhite glass because of its crystal clear characteristics and because Guardian’s unique manufacturing methods allow for quick turnarounds, making it possible to meet virtually any project schedule.
“Viracon is pleased to have Guardian Industries as its float glass partner for the supply of UltraWhite low-iron glass for the reconstruction of the prestigious World Trade Center #7 project,” says Brad J. Austin, Viracon Senior Vice President. “With the use of UltraWhite glass we are able to achieve a crisp appearance and see the "true" color of the silk-screen and coating because of the ultra clear characteristics of UltraWhite glass.”
UltraWhite is a clear, high transmission glass product that can be used virtually anywhere regular float glass is used. Guardian scientists reduced the iron content and added key ingredients to its clear float glass to improve clarity and color neutrality.
Standing 50 floors tall, the rebuilt #7 will use as much as one million square feet of glass. The lead architect for the project is Skidmore, Owings & Merrill LLP from New York and the builder is Tishman Construction out of New York City. Silverstein Properties of New York owns the land.
Guardian Industries Corp., based in Auburn Hills, Mich., is a leading worldwide manufacturer of float glass and fabricated glass products for the commercial and residential construction industries, and the world’s largest producer of mirrors. Guardian Automotive provides complete exterior systems to the global automotive industry and is a Tier 1, top-100 global automotive supplier. Guardian’s Building Products Group includes one of the largest manufacturers of fiberglass in the world and occupies a significant position in the building materials distribution business.
Guardian Industries Corp., based in Auburn Hills, Michigan, is a leading worldwide manufacturer of float glass and fabricated glass products for the commercial and residential construction industries, and one of the world’s largest producers of mirrors. Guardian Automotive provides complete exterior systems to the global automotive industry and is a Tier 1, top-100 global automotive supplier. Guardian’s Building Products Group includes one of the largest manufacturers of fiberglass in the world and occupies a significant and growing position in the building materials distribution business. Guardian, its subsidiaries and affiliates employ 19,000 people and operate facilities throughout North America, Europe, South America, Asia, Africa and the Middle East.http://www.guardian.com/AboutGuardian/Newsroom/News/YearArchive/gi_005404
A Feb 20, 2010 - letter to the Editor provides more facts from them on the glass coming from Carleton plant here in Monroe County - for the top floors of this building.http://www.guardian.com/oracleprd/groups/guardiandotcom/documents/guardian.com_news/gi_013248.pdf