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So, that's more like sterilizing - right? Pasteurizing means keeping at >60°C but below 80°C. Is that possible? Otherwise it is always sterilized in a pressure cooker at 2 bar and 121°C for 30-60 minutes...

Yes, maybe it is already a sterilization. Just not under pressure. It works well for me this way, I have to do it this way because I can only sterilize this amount of substrate with many passes in the steam pressure...

This is how it is delivered. The fact that it is pressed as a brick should make it clear that this is about the dry weight of the coco substrate.