So I cut out foot square pieces and weighed the materials I posted about. They seemed heavy compared to what is available today. But here is the info:
The batts have a bright yellow nylon bonded to one side, and a white scrim (but woven - has a fabric feel to it) bonded to the other. The batts are 44" wide. Each is at least 4 yds long. The lighter batt weighs a little under 12 oz/sq yd, including the fabric and scrim, and the heavier one weighs close to 15 oz/sq yd, including the same. They were quite compressed when I took them out of the 30 gal. container, but after a few minutes were at least 2" loft for the heavier, and around 1.5" for the lighter.
I tested the nylon with some water, and it bounced off it; so I would say it has a good DWR treatment. It appears lighter than 1.9 oz, the old industry standard, but I could not say by how much. It was sold to me as Polarquard, and was used by Synergy Works for bags and jackets that were high-end for the time, 1980's I think. It does appear to be a continuous filament, like Polarquard, but I'm no expert.
About the bonding - Polarguard and many other insulations are laid down in layers, so just because the outer surface of the batt is bonded to a fabric does not assure that it will remain so. I had a "Yak Sack" from Yak Works with Thinsulate bonded to the inner, but the bonding failed eventually, and the inner became loose and bunched around me when turning in my sleep - very uncomfortable. After many years, the inulation on these batts is still bonded to the inner and outer fabrics, however.
Yes, I think an outer shell could be omitted - that was the reason for laminating the fabric to the insulation. The scrim is a woven gossamer material that is smooth to the touch, but one still might want a liner. Or one might use a WPB material for an outer, and leave the laminated nylon for an inner.
Hope that is responsive. You have my email in the earlier post, so let me know if you are interested. Thanks for the inquiry.