I haven't used it, but did find this info. Hope it helps a little!
http://www.all-about-quilts.com/silk-batting.html
I have used a blend with silk in it...Quilters Dream Orient. I loved it! It's too pricey for me though. I just happened to get a good deal on a crib sized one so I tried it out. If I could find a good deal, I'd use it more often.
http://www.quiltersdreambatting.com/dream-orient.htm