Methyl/Phenyl Polysilsesquioxane

INCI: METHYL/PHENYL POLYSILSESQUIOXANE

CAS Number
Variable (polymer); CosIng Ref available
Function
Film forming, skin conditioning, hair conditioning, texture enhancement
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status permitted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Allowed; silicone-based cosmetic ingredients are not prohibited or restricted. CIR has assessed polysilsesquioxanes for safety.

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
not established
Dermal Absorption
low
Sensitization
low

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Non-toxic and non-irritating to skin and mucous membranes; may be irritating to eyes. Polymethylsilsesquioxane (the closely related homopolymer) is considered safe for all skin types.. Unlike the 9 fragrance ingredients above, this is a functional silicone resin. It provides soft-focus/blurring effects by diffusing light to minimize appearance of pores and fine lines. Typical use levels: 4-10% in emulsified skin care; 2-5% in makeup formulations. Offers excellent thermal stability, water resi...

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Concern Level: High

Frequently Asked Questions

Is Methyl/Phenyl Polysilsesquioxane safe in cosmetics?

Non-toxic and non-irritating to skin and mucous membranes; may be irritating to eyes. Polymethylsilsesquioxane (the closely related homopolymer) is considered safe for all skin types.. Unlike the 9 fragrance ingredients above, this is a functional silicone resin. It provides soft-focus/blurring effects by diffusing light to minimize appearance of pores and fine lines. Typical use levels: 4-10% in emulsified skin care; 2-5% in makeup formulations. Offers excellent thermal stability, water resi... The EU classifies Methyl/Phenyl Polysilsesquioxane as "permitted". Safety rating: MODERATE.

Is Methyl/Phenyl Polysilsesquioxane allowed in the EU?

Methyl/Phenyl Polysilsesquioxane EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.

What does Methyl/Phenyl Polysilsesquioxane do in cosmetics?

Methyl/Phenyl Polysilsesquioxane functions as: Film forming, skin conditioning, hair conditioning, texture enhancement. It is classified as a cosmetic ingredient in our database. CAS number: Variable (polymer); CosIng Ref available.

What is the Margin of Safety for Methyl/Phenyl Polysilsesquioxane?

not established The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

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