Can propanediol at 5% with 1% Euxyl PE 9010 used in a face toner cause a skin irritation? I have no problems with propanediol when used alone. I also use Euxyl pe 9010 very often without any issues, so I wonder if maybe this combination is not good, especially in a quick-absorbing water-based product. I know that at least according to marketing materials, propanediol should not cause any irritation, even at higher concentration. Do you use propanediol at this concentration? Any issues? Can the amount of Euxyl be reduced when used with propanediol?