It's time for a better glycol

Personal care formulators no longer have to sacrifice
performance for natural origin

Here’s a sustainable
ingredient that
delivers on both

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Approvals, Certifications & Registrations

Approvals & certifications

Conforms to ISO 16128-1 as Natural Ingredient with a natural index of 1

100% Biobased; USDA BioPreferred Program

C14 analysis (ASTM D6866-16)

Manufacturing certifications: ISO 9001:2015 (quality); ISO 14001:2015 (environmental); ISO 45001:2018 (safety & health)


INCI: Butylene Glycol

CAS: 6290-03-5

EINECS: 228-532-0

REACH: 01-2120764879-30-0000

Typical properties
Characteristic Limit
Appearance Clear, colorless
Odor Faint, characteristic
Purity 99.7%
Water 0.50%
Specific gravity at 20° C 1.004
Viscosity cP at 25° C 97 cP
Acid number, rhg KOH/g Max 0.05
Heavy metals None detected


Brontide natural butylene glycol can help brands substantiate their commitment to creating natural, sustainable products

Woman face cream - non-toxic ingredients
Woman Applying Face Lotion

ISO 16128

What it means

ISO 16128 is an international criterion for defining cosmetic ingredients and products. These guidelines allow brands to categorize Brontide butylene glycol as a natural ingredient. To meet the definition as natural, an ingredient must be sourced naturally and be found in nature. Ingredients obtained from fossil fuels are excluded from the definition.

It’s found in nature

Found in common superfoods like avocados and coconuts, 1,3-butylene glycol is naturally occurring and meets the ISO 16128 standard for natural cosmetics.

100% Biobased

USDA Certified
Biobased Product

What it means

The USDA Certified Biobased Product label displays a product’s biobased content. This is defined as the portion of a product that comes from a renewable source. By choosing a certified biobased product, brands can support their sustainability claims, knowing the USDA and the Federal government stands behind the accuracy of the percent biobased claim stated on the label.

Transparent testing

USDA Certified Biobased products have achieved third-party verification of biobased content using ASTM D6866 testing which measures the amount of biobased content of a material.

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Good for people

Good for people

Brontide Contains

Brontide natural butylene glycol was tested at levels of 10%, 20%, 40%

Clinical Test (HRIPT) showed no fatigue, no skin irritation, no sensitization


Brontide butylene glycol is a high-purity ingredient

Good for formulators

Good for formulators

Boost performance with a multifunctional natural ingredient


HumectantSolventSkin-feel modifierViscosity enhancerPreservative boosterCarrier for active cosmetic ingredientsEmollient


Moisturizers Sheet masks Serums Shampoos Conditioners Perfumes Cosmetics

Brontide natural butylene glycol: Best in class for sensory experience

Study in brief:A panel of 28 people were trained and calibrated to distinguish differences in 10 sensorial dimensions important to skincare products. Three diols (Brontide natural butylene glycol, glycerin, and propanediol) were prepared in identical formulations at a concentration of three percent. In eight of the 10 tested parameters, Brontide natural butylene glycol was perceived to be as good as or better than the glycerin and propanediol alternatives.

Brontide natural butylene glycol achieved superior performance scores in the positive attribute categories of gloss/shine, spreadability and slipperiness with comparable performance in afterfeel and rub out.

Sensory Dimensions

Appearance: (Integrity of shape before application) 1 (Flattens) – 9 (Retains Shape)
Gloss/Shine: (The amount of reflected light of the cream) 1 (Dull) – 9 (Glossy/Shiny)
Rub-out: (Amount of moisture perceived while rubbing) 1 (None) – 9 (Very Watery)
Spreadability: (Ease of moving product over the skin) 1 (Difficult/Drag) – 9 (Easy/Slip)
Grease: 1 (None) – 9 (Very Greasy)
Afterfeel: 1 (Rough) – 9 (Smooth)
Stickiness: 1 (Not Sticky) – 9 (Very Sticky)
Slipperiness: (Ease of moving fingers across the skin) 1 (Difficult/Drag) – 9 (Easy/Slip)
Amount of residue after application: 1 (Strongly Disagree) – 9 (Strongly Agree)
Absorbency: Count of rubs needed for the product to lose wetness, resistance is perceived

Brontide natural butylene glycol was
considered the least sticky and least
greasy in the negative attribute
categories, with similar residue
compared to glycerin and

Brontide natural butylene glycol,
propanediol and glycerin performed
comparably when evaluated for
absorbency, the number of rubs at
which the product loses its wetness
and when a resistance is perceived.

Brontide proven to be as consistent as other natural solvents with predictable solubility performance.

In a study: solubility performance was quantified by measuring the refractive index of serial dilutions of three diols (Brontide natural butylene glycol, propanediol and glycerin) and 15 common natural extracts. Brontide butylene glycol was proven to be a consistent solubilizer for natural extracts.


  • Oat extract
  • Aloe Vera extract
  • Witch Hazel extract
  • Marshmallow Root extract
  • Bamboo extract
  • Camomile Flower extract
  • Lavender Flower extract
  • Pea extract (Pisum Sativum)
  • Peach extract
  • Green Tea extract
  • Calendula extract
  • Bilberry Fruit extract
  • Seaweed extract
  • Algae extract
  • Rosemary extract

Oat Extract Dilution Refractive Index

example of one of the 15 extracts tested


  • Oat extract
  • Aloe Vera extract
  • Witch Hazel extract
  • Marshmallow Root extract
  • Bamboo extract
  • Camomile Flower extract
  • Lavender Flower extract
  • Pea extract (Pisum Sativum)
  • Peach extract
  • Green Tea extract
  • Calendula extract
  • Bilberry Fruit extract
  • Seaweed extract
  • Algae extract
  • Rosemary extract

There is no reformulation required with <i>Brontide</i> natural butylene glycol

There is no reformulation required with Brontide natural butylene glycol

Testing performed shows equivalent functionality to conventional butylene glycol while also being natural and sustainable

A human panel of 55 tested base formulations using 6% butylene glycol resulting in equivalent feedback on several sensory attributesSensory

Hygroscopicity testing concluded that Brontide butylene glycol & petroleum-based butylene glycol absorb moisture at the same rate over timeHumectancy

A corneometer test of 31 subjects showed Brontide to be equivalent to petroleum-based butylene glycolSkin moisturization

Brontide underwent a rigorous stability test to give it an industry leading purity specification and shelf-lifeStability

Brontide and petroleum-based butylene glycol underwent a HRIPT test, both showing no indication of irritationSkin safety

MIC tests were conducted with equivalent results for microbial efficacyAntimicrobial efficacy

Brontide natural butylene glycol is functionally identical to traditionally produced butylene glycol in personal care applications. Use it as a drop-in replacement in existing formulations. To determine functional equivalency, Genomatica used third-party laboratories to conduct comparative performance testing of the primary functional benefits.


real metrics. real impacts.

Good for our planet

Our natural butylene glycol can help companies make better products and achieve sustainability goals.


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