Wall mount in unclear wall material

[Alfakrull]

Hello!

I'm in the process of mounting my TV on the wall. The TV is a Samsung Frame weighing about 8 kilos, and the wall mount has only 4 holes in total. I've been trying to figure out what the wall we want to mount it on is made of for a few days now and could use some advice! The house is from the 1930s and the interior walls are kloasong/rush walls. However, the wall to the neighbor is something else which I first thought was a very thick drywall and then decided it must be lightweight concrete. Now that I have drilled a slightly larger hole, I'm puzzled as it still seems to be some form of thick plasterboard + chipboard? Can it be true that such a drywall can be about 60mm deep? 70mm in, there is insulation. The dust coming out is fine and gray. When drilling a bit deeper, some wood residues also came out from this hole. In a hole I drilled earlier in the same wall to try to figure out what it was, no wood came out, only plaster/lightweight concrete/gypsum.

See attached images!



I have purchased 8x60mm lightweight concrete anchors that I planned to attach with mounting adhesive and then screw in the wall mounts. Since I am now unsure of what the wall is actually made of, maybe it's better to use some universal plug and hope it works! Has anyone done something similar? Will a glued universal plug hold if it turns out to be plaster?

I've never mounted a TV in a correct and durable way before (the student room wasn't as critical) so I appreciate all the input I can get!

 

[A-Man_08]

I was involved in knocking down reed once, it was attached with chicken wire on plywood so the gray is probably more like mortar.

 

[justusandersson]

If it is a partition wall in an apartment building, the core should be brick, unless it's a smaller house with a few apartments. Then it could be a plank wall. You can exclude lightweight concrete as well as chipboard and plasterboard (unless used as wall covering in recent times). A brick wall should be plastered on the inside (without reed matting) but may possibly have some form of wood fiberboard, like treetex. If it's a plank wall, wood screws are appropriate; for a brick wall, regular plugs plus screws.