Avobenzone

✦ Delivers broad-spectrum UVA protection across the full 310–400 nm wavelength range.
✦ Oil-soluble chemical sunscreen filter dissolved directly into the oil phase of any emulsion system.
✦ EU Annex VI approved with a maximum permitted concentration of 5% in finished cosmetic products.
✦ US FDA OTC-recognized sunscreen active permitted up to 3% in North American formulations.
✦ Inherently photounstable — must be combined with photostabilizers such as Octocrylene or Bisoctrizole.
✦ Pairs with UVB filters to construct complete broad-spectrum SPF formulations.
✦ Suitable for daily sun creams, tinted SPF serums, body sunscreens, and UV-protective leave-on products.

Avobenzone, chemically known as Butyl Methoxydibenzoylmethane, is a synthetic dibenzoylmethane derivative first introduced in Europe in the 1970s under the trade name Parsol 1789. It rapidly became the benchmark UVA filter in global cosmetic formulation due to its exceptional absorption range and compatibility with a wide variety of emulsion systems. Today it remains the most widely used chemical UVA screening agent in both professional and consumer sunscreen products worldwide.

What sets Avobenzone apart from other UV filters is its ability to absorb across the entire UVA spectrum with peak absorption at around 357 nm, offering coverage that no other single chemical filter can match. However, Avobenzone undergoes photodegradation upon sustained UV exposure, meaning its protective efficacy diminishes during use without intervention. Professional formulators address this by combining Avobenzone with recognised photostabilizers — most commonly Octocrylene — to prevent breakdown and ensure durable, consistent UV performance throughout the product's intended life.

Rabibazaar supplies cosmetic-grade Avobenzone suitable for professional sunscreen formulators, advanced DIY SPF creators, and cosmetic developers building broad-spectrum sun care products.

INCI Name : Butyl Methoxydibenzoylmethane
Chemical Name : 1-(4-Methoxyphenyl)-3-(4-tert-butylphenyl)-1,3-propanedione
CAS Number : 70356-09-1
Molecular Formula : C20H22O3
Appearance : White to pale yellow crystalline powder
Odor : Faint characteristic odor
pH (1% solution) : Not Applicable (oil-soluble; does not dissolve in water)
Solubility : Insoluble in water; soluble in oils, ethanol, and esters
Specific Gravity : Verify with supplier
Flash Point : >100°C (verify with supplier SDS)
HLB Value : Not Applicable
Recommended Use Level : 1–5% (EU max 5%; US FDA OTC max 3%)
Type : Chemical UVA sunscreen filter (oil-soluble)
Shelf Life : 24 months in original sealed container stored correctly

Skincare (Creams, Serums, Lotions) ★★★★★
Avobenzone is purpose-built for leave-on SPF skincare and integrates seamlessly into O/W and W/O emulsions at 1–5%. Dissolve fully in the oil phase at 70–75°C and pair with Octocrylene for photostable, durable UVA protection.

Haircare (Shampoo, Conditioner, Masks) ★★☆☆☆
Avobenzone has very limited relevance in rinse-off hair formats but can be used in leave-on UV-protective hair serums or heat-defence sprays. Keep concentration low and ensure full dissolution in the oil or solubilized phase.

Soap Making (Cold Process, Melt and Pour) ★☆☆☆☆
Soap making is not a suitable application for Avobenzone — high pH saponification conditions and rinse-off format both render the UV active ineffective and non-functional. Chemical sunscreen actives require leave-on systems.

Body Care (Scrubs, Butters, Balms) ★★★☆☆
Avobenzone can be added to leave-on SPF body butters and balms at standard use levels for outdoor protection. Avoid any rinse-off scrub format where the active is washed away before providing UV benefit.

Sun Care and SPF Formulations ★★★★★
This is the primary and optimal application category for Avobenzone in cosmetic formulation. Combine with UVB filters and a photostabilizer in any emulsion base to build broad-spectrum, high-SPF finished products with proven UVA coverage.

When I formulate with Avobenzone, the first decision I make is always photostabilization — without it, I am building a sunscreen that degrades in the exact environment it is meant to perform in. I treat Avobenzone as one half of a pair, never a standalone active. The most reliable photostabilizer in my formulation work is Octocrylene, which not only stabilizes Avobenzone through an energy-transfer mechanism but also contributes meaningful UVB absorption, giving dual function from a single addition. I also advise formulators new to SPF to validate every finished formula through ISO 24444 SPF testing and ISO 24442 or 24443 UVA testing before product release — calculated SPF values are not sufficient for consumer sun protection claims.

ADVANCED TIP: To build a photostable broad-spectrum chemical sunscreen base, combine Avobenzone at 3% with Octocrylene at 8–10% and Homosalate at 5% in the oil phase. This three-filter system covers the full UV spectrum while Octocrylene prevents Avobenzone photodegradation through triplet energy quenching. Heat the oil phase to 70–75°C and confirm all three actives are fully dissolved before beginning emulsification. The Octocrylene-to-Avobenzone ratio should be maintained at a minimum of 2.5:1 by weight for effective photostabilization.

Normal Skin : ★★★★★ — Performs excellently in leave-on SPF formulations with strong tolerability at all recommended use levels.
Dry Skin : ★★★★☆ — Well-suited when dissolved in emollient-rich oil phases that simultaneously support the skin barrier alongside UV protection.
Oily Skin : ★★★★☆ — Compatible with lightweight, low-emollient bases when carried in non-greasy esters suited to oily skin types.
Combination : ★★★★☆ — Effective in balanced emulsions designed for combination skin with no specific tolerability concerns at standard levels.
Sensitive Skin : ★★★☆☆ — Known to cause contact sensitization or allergic reactions in a subset of sensitive individuals; patch testing is strongly advised before use.
Mature Skin : ★★★★★ — Highly valuable since UVA rays are the primary driver of photoaging; Avobenzone delivers the deep UVA coverage that mature skin formulations require.
Acne-Prone : ★★★☆☆ — Oil-soluble base requires careful non-comedogenic carrier selection using lightweight esters to avoid congesting pores.

CONCEPT 1: Daily Broad-Spectrum SPF 30 Face Fluid
Usage Level : 3%
Key Ingredients: Octocrylene (8%), Homosalate (5%), Cyclomethicone, Dimethicone
Result : A lightweight, non-greasy fluid providing photostable broad-spectrum UVA and UVB protection suitable for daily application under makeup.

CONCEPT 2: Anti-Aging UVA Protective Serum
Usage Level : 2%
Key Ingredients: Bisoctrizole (2%), Niacinamide (4%), Hyaluronic Acid, Cetearyl Alcohol
Result : A hydrating leave-on serum combining photostabilized chemical UVA filtration with niacinamide to actively target photoaging and pigmentation.

CONCEPT 3: SPF 50 Body Sunscreen Lotion
Usage Level : 5%
Key Ingredients: Octocrylene (10%), Ethylhexyl Salicylate (5%), Glycerin, Carbomer
Result : A broad-spectrum body lotion formulated at EU maximum Avobenzone limit delivering durable full-spectrum protection for extended outdoor exposure.

INCI Declared : Yes — must be declared at all use concentrations as a regulated active ingredient
EU Cosmetics Reg : Permitted — Annex VI, entry 27b; maximum 5% in finished cosmetic products
Rinse-Off Limit : 5% (EU); functionally ineffective in rinse-off product formats
Leave-On Limit : 5% (EU); 3% (US FDA OTC sunscreen monograph)
Allergen Alert : Yes — documented contact sensitizer; allergic and photoallergic reactions reported
Skin Safety : Safe at recommended levels; patch test strongly advised
Eye Area Use : Use with caution — avoid direct eye contact
Ingestion : Not for internal use
Pregnancy Use : Consult physician before use in products targeting pregnant consumers
Child Safety : Avoid on children under 6 months; use with caution on older children
Ventilation : Not required under standard cosmetic formulation conditions
Storage : Cool dry place away from direct light and heat; reseal container tightly after every use
Container : HDPE or glass preferred; avoid reactive metals and prolonged UV exposure during storage

⚠️ Avobenzone is a documented contact and photocontact sensitizer. Finished product labels should include a patch test recommendation for sensitive skin types. Photostabilization is not optional — without it, Avobenzone degrades on skin upon UV exposure and may produce breakdown compounds. Never exceed 5% in EU-marketed finished products or 3% in US OTC formulations.

Working pH Range : 4.5–8.0
Heat Stability : Stable up to 80°C; dissolve fully in oil phase at 70–75°C before emulsification
Freeze-Thaw Stable : Yes
Emulsion Type : O/W / W/O / Both
Emulsification Phase: Hot (oil phase only)
Compatible With : Octocrylene, Homosalate, Ethylhexyl Salicylate, Dimethicone, non-polar esters and emollients
Incompatible With : Water phase (insoluble); strong oxidizing agents; UV exposure without photostabilizers (triggers photodegradation)
Oxidation Risk : Low — primary instability mechanism is photodegradation, not oxidation; use Octocrylene or Bisoctrizole as photostabilizers
Discoloration Risk : Possible — can develop a yellow tint upon prolonged UV exposure or in formulations lacking adequate photostabilization
Formulation Notes : Always dissolve Avobenzone completely in the oil phase before emulsification begins. Maintain an Octocrylene-to-Avobenzone weight ratio of at least 2.5:1 to ensure photostable UVA protection throughout the product shelf life.

Q: What does Avobenzone actually protect against?
A: Avobenzone is a UVA-specific filter absorbing across 310–400 nm, covering the full UVA spectrum responsible for photoaging, pigmentation, and deeper tissue damage. It provides no UVB protection and must always be combined with UVB filters such as Octinoxate or Homosalate for complete broad-spectrum coverage.

Q: Why does Avobenzone require a photostabilizer?
A: Avobenzone is inherently photounstable, meaning UV exposure triggers a molecular rearrangement that breaks down the active and reduces its protective capacity during use. Pairing it with a photostabilizer such as Octocrylene prevents this degradation through a triplet energy quenching mechanism, ensuring consistent UVA protection throughout the product's intended application period.

Q: What is the maximum percentage of Avobenzone I can use?
A: The EU Cosmetics Regulation Annex VI permits a maximum of 5% Avobenzone in finished cosmetic products. The US FDA OTC sunscreen monograph sets a lower maximum of 3%. Always formulate within the regulatory limit applicable to your intended market and confirm through validated SPF testing.

Q: Can I add Avobenzone directly to my water phase?
A: No. Avobenzone is completely insoluble in water and cannot be dispersed into an aqueous phase directly. It requires dissolution in the oil phase or in compatible polar oil solvents such as ethanol or esters before the formulation is assembled. Attempting to add it to water will result in an undissolved powder and an ineffective product.

Q: How does Avobenzone compare to Zinc Oxide for UVA protection?
A: Both provide UVA protection but through fundamentally different mechanisms. Zinc Oxide is a photostable mineral filter that scatters and reflects UV radiation without photodegradation, making it preferred for sensitive and reactive skin. Avobenzone is a chemical filter that absorbs UVA energy but requires photostabilization to maintain efficacy. Avobenzone enables lighter, more cosmetically elegant textures while Zinc Oxide offers simplicity and inherent photostability — the best professional choice depends on target skin type, desired texture, and regulatory market.

Product evaluation

Review the specifications, supplied grade, intended use and compatibility of Avobenzone before ordering for production. Test a small quantity in the actual application and document the result before scaling.

Quality control

Inspect the received batch for expected appearance, odor, texture, packaging condition and labeling. Keep supplier and batch records, use accurate measurements, and retain a reference sample when the material is used commercially.

Storage and responsible use

Store tightly closed in a clean, cool and dry location away from direct sunlight. Follow the current supplier instructions and all safety, labeling and regulatory requirements that apply to the intended finished product.