Moderate Cosmetic Ingredient

Methylbutene/Methylstyrene/Piperylene Copolymer

INCI: METHYLBUTENE/METHYLSTYRENE/PIPERYLENE COPOLYMER

CAS Number
Not individually confirmed (polymeric INCI; supplier-specific CAS)
Function
Film forming hydrocarbon resin for cosmetic formulations
Safety Rating
MODERATE

Regulatory Status

🇪🇺 EU Status permitted
🇺🇸 US Status permitted
US Notes Permitted — no specific CFR restriction for cosmetic use

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

Safety Data

Margin of Safety (MoS)
not established
Dermal Absorption
negligible
Sensitization
high

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Residual styrene monomer is neurotoxic and dermally absorbable. Percutaneous absorption of styrene from cosmetic vehicles through human skin has been confirmed. Batch-specific residual monomer testing (GC-MS) is mandatory. Piperylene residuals should also be monitored.

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Concern Level: High

Frequently Asked Questions

Is Methylbutene/Methylstyrene/Piperylene Copolymer safe in cosmetics?

Residual styrene monomer is neurotoxic and dermally absorbable. Percutaneous absorption of styrene from cosmetic vehicles through human skin has been confirmed. Batch-specific residual monomer testing (GC-MS) is mandatory. Piperylene residuals should also be monitored. The EU classifies Methylbutene/Methylstyrene/Piperylene Copolymer as "permitted". Safety rating: MODERATE.

Is Methylbutene/Methylstyrene/Piperylene Copolymer allowed in the EU?

Methylbutene/Methylstyrene/Piperylene Copolymer EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.

What does Methylbutene/Methylstyrene/Piperylene Copolymer do in cosmetics?

Methylbutene/Methylstyrene/Piperylene Copolymer functions as: Film forming hydrocarbon resin for cosmetic formulations. It is classified as a cosmetic ingredient in our database. CAS number: Not individually confirmed (polymeric INCI; supplier-specific CAS).

What is the Margin of Safety for Methylbutene/Methylstyrene/Piperylene Copolymer?

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.

Compliance Tools

Check Methylbutene/Methylstyrene/Piperylene Copolymer compliance across multiple jurisdictions:

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Ingredient Decoder
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82 Allergen Checker
Check for EU declarable fragrance allergens
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Substance Compliance
Check compliance across 55 jurisdictions
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MoS Calculator
Calculate Margin of Safety using SCCS methodology
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Heavy Metal Limits
Compare limits across jurisdictions

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