Quote:
Originally Posted by NiHaoMike
That's a vacuum level of about 75 microns, which is attainable with a good HVAC vacuum pump in good condition.
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That's attainable inside HVAC grade copper pipe with flared connections and relatively little volume to these vacuum panels. As noted it seems it would be near impossible to get similar results, even professional manufacturing isn't quite there yet, hence the limited avail/use.