Propylene Glycol for mixing devlopers

Does the % of glycol matter for developers? is this one OK to use?

http://www.chemworld.com/Gallons-Propylene-Glycol-p/chemworld-pg-1.htm

it shows 99.9% pure. on photo formulary I cant seem to find the % in the MSDS sheet. there is a substantial cost difference between the 2. Having more would just allow me to mix up both pyro-hd and MC as I'm on my last amounts of HD and need to mix up more.

just need to know before ordering. I assume the gallon jug should have a very long shelf life once opened.

thanks

john

John, that 99.9 stuff looks good to me and it will last forever for you.

The shelf life is very long.

PE

99.9 is pretty darn pure... Go with it!

many Thanks!