Methicone Crosspolymer — INCI reference

What it is

Methicone Crosspolymer is a synthetic silicone ingredient based on poly(methylhydro)siloxane (PMHS) that has been crosslinked to form a three-dimensional polymer network. Unlike linear silicones, the crosslinked structure gives it elastic, gel-like or powder-like properties depending on the manufacturing process. In cosmetic formulations it is used as a viscosity modifier, skin conditioner, and texture enhancer, contributing a soft, non-greasy sensory profile. It is compatible with a range of formulation types including water-in-oil, oil-in-water, and water-in-silicone systems. The ingredient reduces surface tension and can act as a mild cleansing surfactant. Its crosslinked silicone backbone makes it chemically stable and resistant to degradation under typical cosmetic use conditions. It is practically insoluble in water and is commonly blended with silicone carrier fluids such as cyclopentasiloxane or dimethicone.

Safety & warnings

Silicone crosspolymers including methicone crosspolymer are generally regarded as non-irritating and non-sensitizing at concentrations used in cosmetics. Related silicone crosspolymers have been evaluated by the CIR Expert Panel and found safe as used. The comedogenicity rating for silicone elastomer crosspolymers is considered very low (approximately 1 out of 5). Rare cases of mild skin or eye irritation have been reported. Individuals with known silicone hypersensitivity should patch-test before use. The base polymer PMHS is classified as a mild irritant (Xi) in industrial contexts, but this relates to the uncrosslinked liquid form, not the finished crosslinked cosmetic ingredient.

Origin & sourcing

Methicone Crosspolymer is synthesized from poly(methylhydro)siloxane (PMHS, CAS 9004-73-3), a silicone polymer derived from silicon, a mineral element obtained from quartz or sand. The crosslinking step involves reacting the PMHS backbone with a polyfunctional crosslinker, forming a three-dimensional silicone network. The process is entirely synthetic and carried out under controlled industrial conditions.

History

Silicone crosspolymers emerged as cosmetic ingredients in the latter half of the 20th century as silicone chemistry advanced in the personal care industry. Methicone and dimethicone crosspolymers became increasingly used in skincare and color cosmetics from the 1980s onward. The EU CosIng database lists Methicone Crosspolymer as a recognized cosmetic ingredient with surfactant-cleansing function. The CIR Expert Panel has assessed related dimethicone crosspolymer ingredients and found the class safe for cosmetic use.

Questions everyone asks

What does Methicone Crosspolymer do in skincare products?

It acts primarily as a viscosity modifier and skin conditioner. It gives products a soft, silky texture and helps them spread evenly, while leaving a smooth, non-greasy feel on the skin.

Is Methicone Crosspolymer the same as dimethicone?

No. Methicone has one methyl group and one hydrogen on each silicon atom in its backbone, whereas dimethicone has two methyl groups. Methicone Crosspolymer is additionally crosslinked into a three-dimensional network, giving it different physical properties compared to linear silicone fluids like di

Is Methicone Crosspolymer safe for sensitive skin?

Silicone crosspolymers are generally considered non-irritating and non-comedogenic at typical cosmetic use levels. Those with sensitivity to silicones should patch-test products containing this ingredient before broader use.

What types of products contain Methicone Crosspolymer?

It is used in a range of leave-on and rinse-off products including sunscreens, moisturizers, primers, foundations, and hair conditioners, where it improves texture and sensory feel.

Sources & references

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