Originally Posted by swankfly
Okay, I am getting there, slowwlllyyy......
Nylon and Polyester are the main fabrics we utilize in Hammock and Tarp construction, some cuben, m90 and other high performance products also.
Uncounted for hammocks, coated for tarps.
Taffeta and Oxford refer to a specific weave, that MIGHT BE USED in either nylon or polyester.
30D 70D 90D are measurements of the weight of the fabric.
70D 210T would be a 70 denier fabric or 210 threads per inch?
Now what the heck is calendared and down proof.
If all this info is compiled somewhere else, please kick me towards the door.
Mostly correct. Ripstop is another weave type; it's more often used in nylon, but can be found in poly as well.
Denier (the "d" in "30d") is actually a measure of the thread
weight, not the fabric weight. However, in a ripstop pattern, most times there is a close correlation between denier and fabric weight. The reason for this is that ripstop is woven to industry standards (as much as the fabric industry has them, anyway), so the way it is woven is pretty similar between thread weights.
Not sure whether "210t" would be the thread count per inch. It sounds
right, but I've been known to be wrong before...
Calendaring is a process in which a synthetic fabric is heat treated with high-pressure rollers on one side. This flattens the fibers out and locks them together (almost the same as heat sealing a cut edge does), making the fabric have a tighter weave. This makes it more wind- and down-resistant. It also makes the fibers weaker (so, the ratings mentioned above in the Warbonnet link may not apply to calendared fabrics).
Most downproof fabrics are calendared (though not all calendared fabrics are downproof). Make sure you check with the supplier before buying (most cottage vendors will know for certain; most big-box stores won't have any idea what you're asking--leastwise, that's been my experience).
Hope it helps!