Chip value estimation

[Harold_V]

Borosilicate glass melts at a much higher temperature. If you're inclned to use glass, don't use borosilicate. I don't know if adding soda ash would be helpful, however. It may dissolve that way. Dunno!

Harold

 

[samuel-a]

Borosilicate glass melts at a much higher temperature. If you're inclned to use glass, don't use borosilicate. I don't know if adding soda ash would be helpful, however. It may dissolve that way. Dunno!

Harold

Isn't Borosilicate glass = borax + silica dissolved in soda ash ??

 

[Harold_V]

Borosilicate glass melts at a much higher temperature. If you're inclned to use glass, don't use borosilicate. I don't know if adding soda ash would be helpful, however. It may dissolve that way. Dunno!

Harold

Isn't Borosilicate glass = borax + silica dissolved in soda ash ??

Don't think so ---I think the boro relates to boron, but I don't know that.

I'll see if I can learn something from Google.

Harold

Edit:

Ok, here's a link that helps explain borosilicate glass, which has boron oxide as part of its makeup.

http://www.5fishdesigns.com/whatisboro.htm

 

[celticsfan]

Borosilicate glass is highly desirable for making telescope mirrors because of its' low expansion and thermal qualities. Maybe Mics' "tons of borosilicate" would have a higher purpose than flux.
John