I am now of the opinion that this undersized by the carrying capacity of the bed frames cheap class for people with more than 50-60kg weight simply are not sufficiently stable. We use two of these slatted frames on a 180x200 bed and the rust of my wife is still completely OK (about 60kg), while I must be replaced now. Although I myself weigh about 110kg, but am also relatively large, so that the weight is distributed well proportioned to my above-average size. The load index of 180kg probably refers to a one-time, short-term stress pulse, which the slats still just endure. A long-term use of this grid with this weight, even with only 100kg is totally out of reality.
I'd still be with mercy law, after all, we have the competitive price get a working slatted frame and broken through the slats are not with me. However, who makes so bold an absolutely utopian load indication, the definitely gets only one star. From 60 Kilo not responsible and therefore not recommended!