Mumia Posted February 22 Share Posted February 22 (edited) Hello, is there any other company than Galvoptics where I can get higher quality Pyrex or Suprax blanks? I need a diameter of approx. 415-420 mm and a thickness of approx. 45 mm. Regards, Chris Edited February 22 by Mumia 1 Link to comment Share on other sites More sharing options...
fozzybear Posted February 22 Share Posted February 22 (edited) https://www.stathis-firstlight.de/spiegelschleifen/materialeng.htm albeit based in Germany also have a read of this archived thread Edited February 22 by fozzybear added text 2 Link to comment Share on other sites More sharing options...
Mumia Posted February 22 Author Share Posted February 22 (edited) I tried to contact most of the people from that thread, but there was no response. That's why I decided to refresh the topic. I also heard about this company from Germany, but what I was most interested in, was someone reliable from our neighborhood. Contact with Galvoptics is also very difficult. I write and call and I feel like I'm being ignored. Maybe you still have someone reliable and good to contact. Edited February 22 by Mumia 1 Link to comment Share on other sites More sharing options...
fozzybear Posted February 22 Share Posted February 22 Maybe someone else might come along with another supplier Link to comment Share on other sites More sharing options...
fozzybear Posted February 22 Share Posted February 22 could also try these people for advise http://www.scientificmirrors.co.uk/telescope making supplies.html Link to comment Share on other sites More sharing options...
NGC 1502 Posted February 23 Share Posted February 23 8 hours ago, Mumia said: Hello, is there any other company than Galvoptics where I can get higher quality Pyrex or Suprax blanks? I need a diameter of approx. 415-420 mm and a thickness of approx. 45 mm. Regards, Chris You might try SGL member Peter Drew. If he doesn’t know a supplier then no one does😊 1 Link to comment Share on other sites More sharing options...
davidc135 Posted February 23 Share Posted February 23 I'd contact Stathis Firstlight in Germany who many people have dealt with, unless you have done so already. If he doesn't have your thickness in stock he can order it. David 1 Link to comment Share on other sites More sharing options...
Peter Drew Posted February 23 Share Posted February 23 Despite the kind accolade I think I would draw a blank on this one (pun intended). Since I "retired" in 2006 all the suppliers I was familiar with seem to be no longer in business. ☹️ Link to comment Share on other sites More sharing options...
Astrobits Posted February 23 Share Posted February 23 When I was making mirrors 20+ years ago I purchased my borosilicate blanks direct from Schott U.K. Ltd. The largest piece that they did as a single cast was 500mm x500mm square x 40mm thick. These I has water jet cut to a circle by a company whose name I cannot remember. If memory serves the 16"dia discs were 75mm thick. I suggest that you contact Schott U.K. and they will advise on who can supply their materials. ( Suprax and Duran are their trade names for borosilicate) Nigel 1 Link to comment Share on other sites More sharing options...
Mumia Posted February 23 Author Share Posted February 23 3 hours ago, Astrobits said: When I was making mirrors 20+ years ago I purchased my borosilicate blanks direct from Schott U.K. Ltd. The largest piece that they did as a single cast was 500mm x500mm square x 40mm thick. These I has water jet cut to a circle by a company whose name I cannot remember. If memory serves the 16"dia discs were 75mm thick. I suggest that you contact Schott U.K. and they will advise on who can supply their materials. ( Suprax and Duran are their trade names for borosilicate) Nigel thanks, I will try to contact them directly. We'll see what comes out. Link to comment Share on other sites More sharing options...
mikey152 Posted March 5 Share Posted March 5 Most of the Borocillicate blanks are now made in China. If you buy them from a supplier in UK as I have done , they just get them from China. I purchase them direct from China and they seem to be good quality. You can get up to 16 inches in diameter and I think up to 50mm thick Link to comment Share on other sites More sharing options...
dark star Posted March 15 Share Posted March 15 I got my 20 inch borosilicate mirror blank a few years ago from Spectra Glass in Scotland. They still sell blanks. I sent them an email but had to also ring them to get a response. They mainly sell glass to businesses but they were happy to sell me a blank, once I rang and explained what I needed. It is 40 mm thick. I am still working on the mirror! I hope to finish it this year. 1 Link to comment Share on other sites More sharing options...
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