Dear Frank:

I received your e-mail through Scott. We have extensive experience in
sol-gel coating technology for different applications. highly pure and
thick SiO2 insulation can be coated on Aluminum oxide substrate for your
application.The sol-gel composition can be tailored to achieve specific
physical, chemical and surface properties that fits your application.
Please contact me to explore this in more detail.

Regards

M.R. Shahriari