On the home page here there is a article for abbreviations. That should help with a lot of the terminology here.
#1 does indeed appear to be untreated. See how easily the edges unravel. I might be usable for a hammock body.
#2 might be sil. Can you blow through it at all? There should be no unravelling on the edges. If you can blow through any at all it is probably DWR. In other words it's coated with a Durable Water Resistant coating. Which probably what #3 has.
#2 is a little heavier than what most here would use but if it is sil you could make a tarp out of it.
#3 is just too heavy for any kind of backpacking use. But hey, maybe a hammock for your back yard.
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