How is the allergen concentration calculated when it comes from a fragrance blend?

The concentration threshold applies to the allergen in the finished product. When the allergen is contributed by a fragrance blend, the allergen content of the blend must be multiplied by the percentage of blend used in the formula. If the result exceeds the threshold, the allergen must be declared on the label.

How do I check if my formula contains BUTYLPHENYL METHYLPROPIONAL?

Use the INCI Checker on CosIng Checker to paste your ingredient list. The checker flags all 26 regulated EU allergens including BUTYLPHENYL METHYLPROPIONAL when matched against INCI names in your formula.

What annex entries are associated with CAS 80-54-6 for BUTYLPHENYL METHYLPROPIONAL?

CAS 80-54-6 identifies BUTYLPHENYL METHYLPROPIONAL in EU regulatory databases. The linked annex records show all Annex II–VI entries sharing this CAS number, including any restriction or prohibition conditions beyond the allergen labelling requirement.

EU AllergenCAS 80-54-6

BUTYLPHENYL METHYLPROPIONAL — EU Regulated Fragrance Allergen

Q: Is BUTYLPHENYL METHYLPROPIONAL banned in EU cosmetics?

BUTYLPHENYL METHYLPROPIONAL is not banned in EU cosmetics. It is a regulated fragrance allergen subject to mandatory labelling. It must be declared by its INCI name on the product label when present above 0.001% in leave-on products or 0.01% in rinse-off products under EU Cosmetics Regulation 1223/2009.

Lilial, BMHCA

BUTYLPHENYL METHYLPROPIONAL is one of 26 fragrance substances required to be declared by INCI name on EU cosmetic product labels under Regulation 1223/2009. Declaration is mandatory when concentration exceeds 0.001% in leave-on products or 0.01% in rinse-off products.

This page links BUTYLPHENYL METHYLPROPIONAL to 1 annex record in the EU cosmetics dataset. Declared on the label when present above 0.001% in leave-on products or 0.01% in rinse-off products under EU Cosmetics Regulation 1223/2009 Annex III.

Leave-on products

> 0.001%

Label declaration required

Rinse-off products

> 0.01%

Label declaration required

Check your formula for this allergen All allergens View annex entries for this CAS

Regulatory status

INCI name

BUTYLPHENYL METHYLPROPIONAL

CAS number

80-54-6

Synonyms

Lilial, BMHCA

Declaration requirement

Must be declared on the cosmetic product label when present above 0.001% in leave-on products or above 0.01% in rinse-off products.

Legal basis

EU Cosmetics Regulation 1223/2009, Annex III

Annex records for BUTYLPHENYL METHYLPROPIONAL

Annex

Entry 1666

2-(4-tert-butylbenzyl) propionaldehyde

Allergen

Why BUTYLPHENYL METHYLPROPIONAL matters for EU labelling

BUTYLPHENYL METHYLPROPIONAL is one of the 26 fragrance substances that must be declared by INCI name on cosmetic product labels when the finished product exceeds the EU threshold. This page currently links BUTYLPHENYL METHYLPROPIONAL to 1 annex record alongside the core allergen-labelling rule.

Declared on the label when present above 0.001% in leave-on products or 0.01% in rinse-off products under EU Cosmetics Regulation 1223/2009 Annex III.

Allergen declaration is a labelling obligation, not an automatic ban. If additional Annex II or Annex III conditions apply through the linked records above, those conditions must be checked separately from the label declaration thresholds.

Frequently asked questions

BUTYLPHENYL METHYLPROPIONAL is not banned in EU cosmetics — it is a regulated fragrance allergen subject to mandatory labelling. It must be declared by its INCI name on the product label when present above 0.001% in leave-on products or 0.01% in rinse-off products. Some allergens may additionally be restricted or prohibited under Annex II or III; check the linked records above.

Declaration of BUTYLPHENYL METHYLPROPIONAL is mandatory when the concentration exceeds 0.001% (10 ppm) in leave-on cosmetic products or 0.01% (100 ppm) in rinse-off products. Below these thresholds, label declaration is not required but may be made voluntarily.

The concentration threshold applies to the allergen in the finished product. When the allergen is contributed by a fragrance blend, the allergen content of the blend (provided by the fragrance supplier) must be multiplied by the percentage of blend used in the formula. If the calculated total allergen concentration exceeds the threshold, it must be declared on the label.

Use the INCI Checker to paste your ingredient list. The checker flags all 26 regulated allergens including BUTYLPHENYL METHYLPROPIONAL when matched against INCI names in your formula.

Open INCI Checker

CAS 80-54-6 identifies BUTYLPHENYL METHYLPROPIONAL in the EU regulatory databases. The annex records linked above show all Annex II–VI entries that share this CAS number, including any additional restriction or prohibition conditions beyond the allergen labelling requirement.

Source note for BUTYLPHENYL METHYLPROPIONAL

This page combines the EU allergen-labelling rule for BUTYLPHENYL METHYLPROPIONAL with 1 linked Annex II–VI record drawn from the current local dataset.

Use this page to review labelling logic for BUTYLPHENYL METHYLPROPIONAL, but verify any final compliance decision against the current official allergen rules, annex text and source files.

View sources View updates

Tools & next steps

Check your formula

Scan a full INCI list for BUTYLPHENYL METHYLPROPIONAL, the other EU allergens and any linked annex restrictions.

INCI Checker

All 26 allergens

Browse the complete EU allergen list and compare BUTYLPHENYL METHYLPROPIONAL with the other regulated fragrance substances.

View all allergens

Annex entries by CAS

View all EU annex records sharing CAS 80-54-6.

View CAS records