Methyl gluceth-20 is a chemical compound, the polyethylene glycol ether of methyl glucose. The number next to PPG indicates the units of ethylene oxide.
Methyl glucose (methyl α-d-glucopyranoside) is composed of glucose with a methyl ether group. It is produced by transesterification techniques.

What it is used for and where it is used
Cosmetics
Skin conditioning agent - Humectant. Humectants are hygroscopic substances used to minimise water loss in the skin and to prevent it from drying out by facilitating faster and greater absorption of water into the stratum corneum of the epidermis. The epidermis is the most superficial of the three layers that make up the human skin (epidermis, dermis and hypodermis) and is the layer that maintains hydration in all three layers. In turn, the epidermis is composed of five layers: corneum, the most superficial, lucidum, granulosum, spinosum and basale. Humectants have the ability to retain in the stratum corneum the water they attract from the air and have the function of moisturising the skin. It is better to use them before emollients that are oil-based.
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CAS: 68239-42-  9 generic to any length PEG