waterproof bias binding tape

How do I determine if its silicone, or urethane? I've got some no-name no-description fabric from Walmart I'm doing prototypes with.

Urethane coating is always on one side of the fabric, not both. Silnylon is typically impregnated and looks the same on both sides. Not sure how a burn test would come out.

Are those the only two coatings used? What about coated packcloth or something like that (hopefully that exists. I just pulled it out of the air. I've got something like it here).

The most common for packcloth and similar nylons and polyesters is urethane. Silicone is relatively new. If Penny's comments on telling them apart leave you wondering, remember that silnylon is translucent (except maybe black silnylon??).

There are PTFE coatings (e.g. GoreTex) but those are white. Probably a couple of others.

If you bought it cheap at a Walmart, it's likely urethane coated.

Mike

fabric from Walmart I'm doing prototypes with.

Mostly, I'm trying to think as I think there's one other. The typical coated packcloth, cordura, or tent fly is urethane coating. Occasionally you'll find vinylized Cordura.

P.

I did get some silnylon at Walmart, 15 yards, $1/yd. I had to go to 7 stores to find some though. That stuff was like the Holy Grail there for a bit for me (folks on the backpackinglight.com list were talking about finding it in the $1 bin at Walmart). Then, I realized, I could also be picking up some of this other outdoor fabric for prototypes and such, which I've been doing.

I got some nylon that, well, would do really well for a Halloween thru-hike, due to the color scheme. Orange with black ripstop grid.