ifcMaterial is actually quite a complex subject - IfcMaterial
So, again it all comes down to being able to (easily) add Psets and fill out the required information depending on what’s requested by whoever is doing the asking !
& all of that is related to the thorny subject of LOIN (Level Of Information Need) which is being codified as an ISO as we speak…
The only way of doing that easily is via a plugin by @rtches - see more here IfcSite Psets - How to create? - #6 by rtches
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