I have noticed that most vendors use 30D silnylon and/or 20D silpoly for their tarps, my question is why 20D instead of 30D silpoly when the biggest concern with silpoly seems to be strength? I have a 20D silpoly tarp from Warbonnet that I'm happy with so far, I am just curious why 20D became the dominant choice, it just seems backwards to me given the knowledge I have.
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