Ingredient dictionary

PPG-6

Also listed as: Polypropylene glycol

PPG-6 is a polypropylene glycol, a lightweight polymer built from about six repeating propylene glycol units. It helps blend ingredients and gives formulas a smooth feel. It is on the label of 11 products in our library. Checked against our library November 6, 2026.

What PPG-6 does

Helps ingredients mix evenly
Adds slip and a smooth feel
Supports conditioning in rinse-off products

PPG-6 belongs to the polypropylene glycol family. These ingredients are made by linking propylene oxide molecules together in a chain, with the number after the dash showing roughly how many units are in each chain. Chemists make the family in a range of chain lengths, so each member behaves a little differently.

Formulators use PPG-6 for a few simple reasons. It helps other ingredients stay evenly mixed, and it can add slip so a product spreads and rinses away easily. It is light rather than heavy, so it does not usually leave a greasy film. In shampoo, it helps the formula feel smooth in the hand.

Good for

Suits shampoos and other rinse-off hair products for anyone who wants a smooth, light feel.

Frequently asked questions

Is PPG-6 safe for hair?

PPG-6 is generally well tolerated in rinse-off hair products. It is not in any ingredient group we flag for a closer look. As with any ingredient, a person with a known sensitivity should check the full ingredient list and do a patch test first.

What is the difference between PPG-6 and PEG?

PEG stands for polyethylene glycol, made from ethylene oxide units. PPG-6 is made from propylene oxide units, so its chain has a slightly different shape. Both are used in formulas to help blend ingredients and add slip.