Karl,
Polymicro Technologies makes a variety of fused silica capillaries
that range from 2 microns ID (that would be metric ;)) higher.
ODs vary from 150 to 350 or so.
Etching: HF conc.
Contact me if you have more questions.
I have made tubes 3 micron ID 20 micron OD by etching: it's
beautiful at those dimensions.
Out of curiousity: what do you use these tubes for??
I use them for microbubble production.
Regards
Ashok



At 03:04 PM 10/6/98 -0400, you wrote:
>I need to etch holes in a glass substrate (lead glass), the thickness of
>which are between 0.5mm and 3.0mm. I was told that I should be able to
>achieve an aspect ratio (hole diameter to substrate thickness) of about
>100:1. I am looking for through-hole sizes about 50 microns in diameter (at
>least on the surface). Etching could be carried out from both sides of the
>glass. Can anybody please offer me any information on the correct acids
>(solvents for lead glass only), temperatures, times etc,etc,etc.....
>
>Also, does anybody know where I might be able to procure glass capilliary
>tubes with inside diameters in the range of 20microns!)
>
>All information would be gratefully recieved!
>
>                       Karl Cazzini
>
>
>
>email:         [email protected]
>
>
>
>
>
>