Diisobutylene

INCI: DIISOBUTYLENE

CAS Number
25167-70-8 (mixture of 2,4,4-trimethylpentene isomers)
Function
Solvent and chemical intermediate; primarily used as a monomer in copolymers such as Sodium MA/Diisobutylene Copolymer rather than as a standalone cosmetic ingredient.
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status permitted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Not specifically listed in 21 CFR for direct cosmetic use; no FDA prohibition.

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

Volatile organic compound and flammable chemical; primarily used as a monomer precursor in copolymers rather than as a standalone cosmetic ingredient; no CIR monograph available.

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Concern Level: Moderate

Frequently Asked Questions

Is Diisobutylene safe in cosmetics?

Volatile organic compound and flammable chemical; primarily used as a monomer precursor in copolymers rather than as a standalone cosmetic ingredient; no CIR monograph available. The EU classifies Diisobutylene as "permitted". Safety rating: MODERATE.

Is Diisobutylene allowed in the EU?

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

What does Diisobutylene do in cosmetics?

Diisobutylene functions as: Solvent and chemical intermediate; primarily used as a monomer in copolymers such as Sodium MA/Diisobutylene Copolymer rather than as a standalone cosmetic ingredient.. It is classified as a cosmetic ingredient in our database. CAS number: 25167-70-8 (mixture of 2,4,4-trimethylpentene isomers).

What is the Margin of Safety for Diisobutylene?

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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