source for sil poly tarp?

Simply Light Designs comes to mind.

I have a Hammock Gear SilPoly tarp that I have been very happy with. Their Flat Tarp is either 11′ or 12′ long and 9’6″ wide.  Nice tarp, good tie-outs.

Dutchware has a 10′ x 9.5′ rectangular Xenon 1.1 (20D silpoly). Has 2 panel tieouts per side. They will also do custom sizing. 10 to 12 day wait period. Many colors available. https://dutchwaregear.com/product/dirtbag-den/#size-color

I should add: no PU coatings please (I noticed that Rip stop by the roll silpoly uses PU).

Simply Light Designs.  Custom size with options… pleasure to do business with every time and fairly quick turnaround.

Dutchware also….

Interesting. I didn’t know Dutch was bonding silpoly tarps.

RSBTR silpoly is a silicone/PU blend on both sides. Dutchware Xenon 1.1 just says “siliconized” in the description, but probably has some PU in it. Simply Light Designs uses RSBTR fabrics. Good luck finding any pure silicone silpoly (like with TT SS2 tents). Let me know if you do locate any. As if a bit of PU in a silcone blend would be noticeable with an auxiliary tarp anyway. PU on one side and silicone on the other is something I’d avoid though. A silicone/PU blend allows for a lower weight in obtaining a desired HH level than pure silicone alone (and is cheaper to produce).

Extremtextil has this silpoly https://www.extremtextil.de/en/ripstop-polyester-tentfabric-silicone-coated-30den-45g-sqm.html that allegedly has no PU

“Good luck finding any pure silicone silpoly ”

Thanks, Monte, for your helpful post.  Having followed silnylon from its inception, warts and all, I’ve dealt with a lot of ‘pure’ sil coated fabrics, most of which were not very waterproof, and some of which were a joke on that score.  At one time folks were plastering this site with reports of silnylon shelters “misting” inside during storms.  More recently, many believe that it is just internal condensation being blown about by high winds shaking the tent walls.  Don’t really know, but do know that the earlier silnylons were leaky, thanks to the kind efforts of Roger Caffin, Richard Nisley and later Stephen Seeber doing water resistance HH tests and reporting the results.  Without them, I never would have known what sil coated fabrics were reliably waterproof.

P.S. – Have found that the silpoly used by Yama on its flat tarps is quite strong and waterproof, but haven’t had an HH test done.  It is 1.08 oz/sq/yd, quite a bit lighter than other silpolies, except some of the sub one oz offerings that were plain woven without riptstop, large or mini, and did not test waterproof after simulated aging.