Is it silicone adhesive that kitchen and bathroom remodelers use to "glue" a porcelain sink to the underside of a granite countertop around the perimeter of the cutout? Something else?
P.S. I know there's also a kind of screw attachment; I'm interested in the chemical composition of the substance since I want to detach the sink from the countertop.
Most likely it's silicone. You should be able to cut it with a razor/knife to free the sink and then scrape/peel it off completely once the sink is out of the way.
You can get silicones that are also adhesives. Best of both worlds.
Just search "silicone adhesive".
Whatever it is it's softer than both granite and porcelain
Just use a wire to cut through it.
