Platelink belts are the heaviest-duty belt in the repertoire. They are closely related to the caterpillar tracks of a tank, or a JCB digger.
They are extremely expensive, and only used in the most brutal and strenous applications, where even an ultra-thick rubber belt would be shredded (or melted).
Perhaps the most common application for these monsters is in the metal recycling industries, where the belts carry sharp and heavy metal sections that would puncture and rip the heaviest of rubber belts.
Having said this, we have seen a large platelink conveyor - with 6mm thick platelets - bent and damaged just by plastic waste. Materials can be suprisingly tough when crushed and compressed.