pyrex, duran, simax and kimax (clear) are all what's called "labgrade" or i guess medical grade. Chinese boro I'm not sure about and would shy off from calling that, although it probably is, too. any coloured boro may not be termed lab or medical grade, as the metal oxydes will leach and contaminate the substances contained in a vessel made with it.
Here's my anecdote as to why they specify "medical grade":
In Australia it's illegal to feed or inject chickens which are grown for consumption with hormones ... this is common knowledge, however there is one company who, as part of their marketing, puts "hormone free" on their packaging! ... I think in the same way, companies might just point out the fact that clear boro is, for the most part anyway, lab or medical grade - just good old-fashioned marketing.
And, anyway ... urmmm ... why were you checking out toys?
"Medical Grade Pyrex"???????
It's a keyword. When I make toys I'll say it's medical grade too.
