Undiluted propylene glycol is minimally irritating to the eye, and can produce slight transient conjunctivitis (the eye recovers after the exposure is removed).
en.wikipedia.org The plant produces ethylene, propylene and other products through steam cracking of ethane and propane.
en.wikipedia.org Antiperspirants with propylene glycol, when applied to the axillae, can cause irritation and may promote sensitization to other ingredients in the antiperspirant.
en.wikipedia.org Besides ethyl alcohol it contains water, isopropyl alcohol, glycerin, carbomer, fragrance, aminomethyl propanol, propylene glycol, isopropyl myristate, and tocopheryl acetate.
en.wikipedia.org There is often a substantial advantage to cutting with an injector torch (see the propane section) rather than an equal-pressure torch when using propylene.
en.wikipedia.org