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- American Iron and Steel Institute: http://www.steel.org/
- American Society for Testing Material: http://www.astm.org/
- Architectural Testing, Inc: http://www.testati.com/
- Copper Exclusive: http://www.copperexclusive.com/
- International Organization for Standardization: http://www.iso.org
- National Association of Architectural Metal Manufacturers: http://www.naamm.org/
- Underwriters Laboratory http://www.ul.com/global/eng/pages/
- Copper Development Association http://www.copper.org/
- Specialty Steel Industry of North America http://www.ssina.com/index2.html
- The Construction Specifications Institute http://www.csinet.org/
- RCI http://www.rci-online.org/
- TUV http://www.tuv.com/global/en/index.html
- RMI Titanium http://rtiintl.com/
- Alltrista Zinc http://allzinc.com/
- Stainless Architecture http://www.stainlessarchitecture.com/index.cfm/ci_id/17527/la_id/1.htm
- Allegheny Ludlum http://www.alleghenyludlum.com/