What do you think these windowsills are made of? Maybe stone or eternity?

[Ellington]

Had similar benches in the house.
When we were going to replace the windowsills in conjunction with window replacement, I saw a sticker on the underside where the manufacturer was listed.
Svenska eternit in Lomma.
So I assumed there was asbestos in the benches.
They were also much heavier than one would imagine based on the size.

Interesting! Unfortunately, there are no such signs on my windowsills as far as I can see, and I do not intend to replace them.

 

[Ellington]

It seems that the white bubbly underside of my window sills is some kind of wallpaper. It doesn't seem like my window sills have the bubbly texture on the underside, but rather that they have exactly the same smooth texture on the underside as they do on the top side. In fact, on one of the sills, a bit of the underside's wallpaper is missing, revealing a smooth sill surface. Does this suggest that they are not made of Eternit?

From what I understand, Eternit sills were cast, and when cast, they had a different structure on the underside than they had on the top side. So if the window sills have the same smooth structure on the underside as they do on the top side, does this mean that the window sills are not cast and therefore not made of Eternit (asbestos cement)?

 

[Staffans2000]

does that then mean that the windowsills are not cast and therefore not made of Eternit (asbestos cement)?

No. Quite the opposite, since the stone slabs I have seen have never been polished on the underside. But Eternit or not, it doesn't matter if you just leave them alone.

Staffan