How to remove stubborn tile adhesive?

that is a cup for the angle grinder. You use it for the corners where the big grinder can't reach. It's nothing for the surface; with that, you'll end up filing by hand. Especially since dust extraction doesn't work 100% with these things

OK, but the big machine then has something similar underneath?

Yes, it then looks like that only bigger

Hi

Look for a single-disc sander with an alumina disc or a 1- or 2-disc sander with diamond blocks
e.g. from Boels for rent

Olli

1979 was a good year for asbestos.

Do you need the 4mm? If they are that solid, just tile over them and that's fine.
But if they still need to be removed, you need a concrete grinder and sanding only at the end..

If you want to be sure, just send in a sample before grinding. That usually only costs a two-digit amount. However, it only makes sense if you also take the consequences when the sample is positive. That means very expensive specialist companies, etc. I would grind with a mask and suit and be done with it.

you can't tile over that. Either level everything to one height with leveling compound or grind. Depending on the area, 4mm is a lot of (expensive) leveling compound.

Thank you. I was at Boels today. The sanding will cost me about 500 EUR (including vacuum) or 700 EUR if I'm unlucky and the blocks are not sufficient. The leveling compound will probably cost more and have the disadvantage of a higher build-up. I will wear a mask and, following your recommendation, also a suit (but what exactly for?).