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Re: [ATM] Borofloat 33

> The way to test for strain and inhomogeneity is to use crossed polarizing 
> filters

As I sell borofloat blanks to ATMs, I have tested countless pieces with the 
crossed polarizer method. I never saw any shadowing - no problems in this 
respect.

> I think the 92% includes the reflection losses from the two faces.

Really? Can somebody confirm this or the opposite? To my understanding the 
transmittance number should allways be given without reflection losses, but I 
don'r know for sure. If I look through them (25 mm thickness), they seem to 
be completely clear like looking throuh a clean window, but I can't say, if 
this is as good as with optical glass.

Greetings

Stathis Kafalis
www.stathis-firstlight.de

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