Isononyl Isononanoate

What is Isononyl Isononanoate?

Isononyl Isononanoate is a synthetic ester formed from isononyl alcohol and isononanoic acid, belonging to the class of branched-chain fatty acid esters. It appears in various cosmetic categories, including facial moisturizers, body lotions, foundations, sunscreens, and hair conditioners. In formulations, it functions by providing lubricity and a silky texture, allowing products to spread evenly without greasiness. As an emollient, it temporarily fills skin irregularities to promote smoothness and aids in reducing transepidermal water loss when combined with other ingredients. Its antistatic properties help neutralize electrical charges on hair, improving combability and reducing frizz. Additionally, it serves as a skin conditioning agent, enhancing the overall suppleness and flexibility of skin and hair shafts. Valued for its quick absorption and dry-touch finish, it suits lightweight, mattifying product textures.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Antistatic agent
Reduces static electricity and flyaways by improving surface conductivity, enhancing hair manageability and smoothness in conditioners and styling products.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.

Benefits

Delivers a smooth, soft feel to skin by mimicking lipid-like properties.

Improves product spreadability and blendability for even application.

Neutralizes static in hair formulations for better manageability.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals seeking non-greasy emollients in oil-free skincare.
Those with rare sensitivities to synthetic esters.
Users of makeup needing enhanced slip without residue.
Individuals preferring only plant-derived conditioning agents.
People with hair styling products aiming for reduced flyaways.
Anyone experiencing contact reactions, pending patch testing.

Safety Notes

  • Deemed safe for use in cosmetics by expert reviews.
  • Shows low comedogenic potential and minimal irritation risk.

Frequently Asked Questions about Isononyl Isononanoate

What does Isononyl Isononanoate do in products?

It softens skin, improves spreadability, and reduces static buildup in hair care.

Is it suitable for acne-prone skin?

Yes, with a comedogenic rating of 0, it poses low risk of pore clogging.

Does it cause irritation?

Evidence points to low irritation potential in cosmetic use.