View Full Version : Opal glass patent - fluoride & phosphate free?

Brian Graham
03-16-2012, 06:10 AM
I stumbled upon this and thought it was worth sharing.


Pete VanderLaan
03-16-2012, 06:53 AM
Well, from what I read there, it's certainly not phosphate free, containing 5-9% phosphate with a remarkably high barium content and a really pretty low silica content on the lower end, anywhere from 55-70%.

You do have an interesting "must Read" library for late at night.

Dave Bross
03-16-2012, 09:32 AM
Here's the one you really need to be up late reading:

US patent # 4536480