Film-Forming Agent

Dipentaerythrityl Hexa C5-9 Acid Esters

INCI: DIPENTAERYTHRITYL HEXA C5-9 ACID ESTERS

Reviewed by Kate · Last updated 14 Aug 2026

A synthetic ester that conditions skin and hair whilst providing a smooth, lightweight feel

Best For Skin Types

All

Addresses

Dryness

Usage Frequency

Daily

What Is Dipentaerythrityl Hexa C5-9 Acid Esters?

Dipentaerythrityl Hexa C5-9 Acid Esters is a synthetic ester derived from pentaerythritol, a polyol alcohol. It is created through the esterification of branched-chain fatty acids (C5-C9 chain length) with this polyol backbone, resulting in a complex ester that functions as a conditioning agent and texture modifier in cosmetic formulations.

In skincare products, it serves primarily as a skin and hair conditioning agent, helping to improve the feel and spreadability of formulations. It also functions as a plasticiser, which means it can enhance the flexibility and adherence of film-forming ingredients in certain product types.

How It Works

This ingredient works by depositing a thin, occlusive layer on the skin's surface that helps to reduce transepidermal water loss whilst maintaining a smooth feel. Unlike heavier oils, its branched-chain ester structure gives it a lower viscosity, so it spreads evenly without leaving a tacky or oily sensation.

As a plasticiser, it improves the film-forming properties of other ingredients, allowing them to adhere better to the skin and hair whilst remaining flexible rather than rigid or flaky.

Clinical Evidence & References

Published clinical data specifically on this ingredient in skincare is limited. However, as a class, synthetic esters of this type have been studied for their safety profile in cosmetic applications and are recognised as non-irritating conditioning agents in well-formulated products.

Its use in skincare remains primarily empirical, based on cosmetic chemistry principles and formulation experience rather than robust clinical trials. If conditioning and texture are your priority, this ingredient is generally effective in that role, though more targeted research would help clarify any additional skin benefits.

How to Use

This ingredient is typically used as a minor component in formulations rather than a primary active, so there is no special usage protocol. Simply apply products containing it as directed. It works well in both morning and evening routines and poses no interaction concerns with most other skincare ingredients.

Safety & Precautions

Generally well-tolerated and recognised as safe in cosmetic use by regulatory authorities. It is not known to be a sensitiser or irritant in the concentrations used in skincare products.

Frequently Asked Questions

From the Clinic

Not sure what your skin actually needs?

Two minutes, a few questions, and we’ll point you at what matters — no guesswork.

Take the skin quiz

Learn More About Skincare Ingredients

Explore our comprehensive ingredient glossary to understand what's in your products.

Browse All Ingredients

Authorised Stockist

Official UK retailer

Tracked Delivery

Free UK shipping over £50

5 Star Rating

Trusted by thousands

Expert Advice

Free consultations