Ppg-20-peg-20 hydrogenated lanolin (inci)

PPG-20 is the acronym for "polypropylene glycol", the polymer of propylene glycol (1,2-propanediol), a dihydric alcohol. The number after "PPG" indicates the average number of propylene glycol molecular units, for "PPG-20" this is 20 propylene glycol molecular units.

"PEG" means "polyethylene glycol", a polymer (macromolecule of low-molecular monomers - basic building blocks) of ethylene oxide (-CH2-CH2-O-). The number 20 after "PEG-" indicates the average number of ethylene oxide units, here 20 molecular units. "hydrogenated lanolin" refers to hydrogenated, hardened lanolin.
PPG-20-PEG-20 hydrogenated lanolin is used in cosmetic formulations. The mixture of substances acts as an emulsifier (surface-active substance which is used in cosmetic products as an additive to combine two immiscible liquids - e.g. oil and water - into one emulsion).