What do you call this kind of attraction?

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SUMMARY

The phenomenon described involves two pieces of dry glass material that, when pressed and rubbed together, create a strong attraction due to the removal of air between them, leading to a vacuum effect. This results in a friction force that prevents them from being easily separated, akin to the attraction of a neodymium magnet to iron. The action does not cause any physical damage to the glass surfaces. This discovery was made using glass prisms from binoculars, highlighting an interesting aspect of material interaction.

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Buzzworks
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-You get two pieces of dry glass material with perfectly flat faces.

-You press and rub them together. Initially, they seem to glide smoothly against each other...

-...Eventually, after a few strokes, friction force gets very strong until the point you can't rub them at all.

-A this stage the two pieces of glass have become stuck to each other, strongly!

-They will remain stuck indefinitely until you force them apart. You can drop them on the carpet and still remain stuck, you get the idea that this is a very strong attraction, almost like a neo magnet to iron!

-The action does not cause any damage, no scratch, nothing.

-I suspect the action drives all the air out between the glass pieces and outside air pressure takes over??

-I discovered this by accident when I decide to amuse myself with two glass prisms from a pair of binoculars! Any ideas what causes this attraction?
 
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