Question: is hexylene glycol the same as propylene glycol?
Answer: Hexylene glycol (HG), also known as 2-meth- yl-2,4-pentanediol and as 2,4-pentanediol, 2-methyl, is used as a defoaming agent, coup- ling agent and emulsifier. ... Of the diols, propylene glycol (PG) is a well- known irritant and contact sensitizer (3-5).