Hi Dave and Walter.

These old Glass bead sizes can be a real pain at times.

You may well have solved this problem, but if not, you may want to try Hodge Clemco as my contact ([email protected]) tells me they can supply all AGB- sizes to meet AMS2431/6.

The typical Silicon content is 73% and never less than 67% so that all looks good. Contact details: [email protected]

I can't imagine the varying sample size will be an issue as it's the percentages of those samples that are critical values.

Hope this helps.

Very Old Tom