crucible for melting microcrystallized glass

[fengxian]

I am looking for a crucible which can stand up to 1700C for melting microcrystallized glass ceramic (similar to Robax glass). I have succeeded in making small samples with platinun crucible, but have problem with crucibles when making large size glass. Could anybody suggest where I can buy suitable crucibles. Thanks in advance.

 

[unclesyd]

If you can use alumina crucibles here is a source.

http://www.glasscolor.com/catalog/crucibles/index.asp