Good Emollient

Polyisobutene

INCI: HYDROGENATED POLYISOBUTENE

CAS Number
61693-08-1
Function
film-forming, adhesion agent, viscosity-increasing, skin-conditioning
Safety Rating
GOOD

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status permitted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes CIR safe in cosmetics at present practices of use. Hydrogenated grade preferred over non-hydrogenated for improved oxidative stability. Provides tackiness and cling in lip gloss. Oral ingestion from lip products safe given high molecular weight limiting GI absorption.

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

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
negligible
Sensitization
none

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Hydrogenated polyisobutene is a synthetic tackifier providing cling, adhesion, and non-drip consistency in lip gloss formulations at 20-60%. CIR confirms safety at cosmetic use concentrations with no MOSH/MOAH concerns. Oral ingestion risk from lip products is low due to high molecular weight limiting GI absorption, with hydrogenated grade preferred for oxidative stability.

โš ๏ธ
Concern Level: Low

Regulatory Flags

cir-approved lip-safe film-former tackifier adhesion-agent lip-gloss oral-safe high-molecular-weight no-moah-concern synthetic-polymer

Frequently Asked Questions

Is Polyisobutene safe in cosmetics?

Hydrogenated polyisobutene is a synthetic tackifier providing cling, adhesion, and non-drip consistency in lip gloss formulations at 20-60%. CIR confirms safety at cosmetic use concentrations with no MOSH/MOAH concerns. Oral ingestion risk from lip products is low due to high molecular weight limiting GI absorption, with hydrogenated grade preferred for oxidative stability. The EU classifies Polyisobutene as "permitted". Safety rating: GOOD.

Is Polyisobutene allowed in the EU?

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

What does Polyisobutene do in cosmetics?

Polyisobutene functions as: film-forming, adhesion agent, viscosity-increasing, skin-conditioning. It is classified as a Emollient in our database. CAS number: 61693-08-1.

What is the Margin of Safety for Polyisobutene?

adequate 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.

๐Ÿ“ฑ

Is Polyisobutene in Your Products?

Scan any product label with Piro โ€” our free ingredient scanner. Point your camera at the ingredients list and get instant safety scores for every ingredient.

Try Piro Free โ†’

Analyze Your Full Ingredient List

Paste any INCI list into the Decoder for instant safety analysis, or calculate the Margin of Safety for Polyisobutene in your formulation.