I dunno what about US made canopy glass, but Russian polycarbon glass used for canopy glass production has 90% optical transmissivity.
http://viam.ru/optical_glass
The canopy with 90 % transmissitivity is the one without gold coating ( aka completely transparent , commonly used on aircraft where RCS isnot important) like this :
As soon as you add a reflective gold layer , the canopy don’t have 90% transmissivity anymore
While TDK ITB RAM has “over 60%”. https://product.tdk.com/info/en/catalog/datasheets/e9e_bdj_003.pdf
the panel with transmissivity of > 60% was designed to absorb electromagnetic wave with frequency of 5.8 Ghz , since the glass is a 1/4 wavelength absorber , it will be alot thinner if it was designed to absorb radar frequency of 8-12 Ghz ,thus will have higher transsmissivity
other mechanical characteristics which are unclear and may be not sufficient to by used for canopy production.
the main component are indiumn oxide and Polycarbonate which is actually what used on fighter canopy , it is also shock resistantce , i see little reason why it cant be used on fighter
When there is a huge metallized(i.e. ideally reflecting in RF) canopy, after all – who will care about some tiny IRST station?!
Canopy can be coated with internal transparent RAM layer too
Stealth techniques
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