Well, not actually a liferaft or PDF but it kept her afloat.
japantoday.com/category/national/missing-woman-rescued-near-tokyo-after-36-hours-adrift-at-sea
If it floats better then me, especially after 36 hours, I wouldn't care what standard if was manufactured too 
Select to expand quoteJonE said..
Bloody swim rings. There should be standards for those things.
I don't think you can blame the swim ring, at a guess, can't swim so buys floaty device, "oh dear I seem to be getting further from the shore, what foul magic is at work here?".
