"Securest" flammability treatment?

[greenmansions]

Does anyone know what this stuff is? I've noticed it on a lot of kids' PJs lately - with Hanna Andersson being the most recent addition.

The website for the company who makes it does not disclose anything about what the stuff actually is.

http://www.securestfabric.com/About/about.htm

[retromama]

I was wondering the same thing. According to the flamesafe website they link to:

The Securest™ system imparts durable flame retardant properties to cotton by producing an invisible polymer containing phosphorus and nitrogen, inside the cotton fibres. When flame comes into contact with Securest™ treated cotton, an insulating char is formed with no melting, smouldering or after glow.

It's not new, they say it's been used since the 1950s.
More info here, they claim it's as "safe as table salt"

Not sure how that compares to other treatments or what I think about that -- for now I'm sticking with the "illegal" all cotton stuff until I run out.