RESMETHRIN
See the summary at the top of this page. CosIng, Annex II of Regulation (EC) No 1223/2009 (prohibited substances), Consulted on 23 October 2026.
Official label name (INCIInternational name of cosmetic ingredients: the one printed on the pack. name, EU glossary of cosmetic ingredient names), No 24109
Who it concerns
What official classifications and rules say for each group. A classification describes the hazard of the pure substance, not the risk of a product that contains it, which depends on the dose and the exposure.
Prohibition or serious classificationThe text prohibits the substance for this use, or ranks it among the most serious hazards (known or presumed carcinogenic, mutagenic or reprotoxic, identified endocrine disruptor).Worth watchingThe text sets a condition or flags a hazard worth knowing: allergen, suspected effect, condition for children, hazard to the aquatic environment.For informationOfficial information with no condition on a finished product: warning to read, irritation of the pure substance.
Pregnancy and breastfeeding
No classification harmonised by the European Union covers reproduction, the unborn child or breastfeeding for this substance. This does not mean it has been judged to have no effect during pregnancy.
Babies and children
The Cosmetics Regulation sets no age-related condition for this ingredient.
Skin, eyes and allergies
No harmonised classification for sensitisation, irritation or eye damage, and no obligation to label it as an allergen.
Environment
Worth watchingThe text sets a condition or flags a hazard worth knowing: allergen, suspected effect, condition for children, hazard to the aquatic environment.
Worth watching Classified under the CLPEU regulation that classifies chemicals by their hazards (EC No 1272/2008). Regulation: hazardous to the aquatic environment, short term, category 1 (Aquatic Acute 1); hazardous to the aquatic environment, long term, category 1 (Aquatic Chronic 1).
Read on the label
The Cosmetics Regulation requires no warning to be printed for this ingredient.
Regulation (EC) No 1272/2008 (CLP), consolidated version, Annex VI table 3, retrieved 21 October 2026.
In plain words
What it is used for
Functions declared by manufacturers:
The functions and their explanations appear in the summary.
Functions declared in the CosIngThe European Commission's database of cosmetic ingredients. inventory. CosIng, inventory of cosmetic ingredients (INCI names, CAS, EC, functions), retrieved 21 October 2026.
CosIng, list of cosmetic functions, retrieved 30 October 2026; source text read on 30 October 2026.
What the rules say
No EU rule targets this ingredient specifically. It remains subject to the general rule: every product must undergo a safety assessment before it is sold (Article 10 of Regulation (EC) No 1223/2009), under the manufacturer's responsibility.
See the summary at the top of this page.
What we know about this ingredient
Uses
End-use products intended for wide area mosquito abatement programs /are/ Restricted Use Pesticides due to acute fish toxicity. For retail sale to and use only by certified applicators or persons under their direct supervision and only for those uses covered by the certified applicator's certification.
Food uses include crack and crevice spray and enclosed space fog in food handling establishments such as food processing/handling plants, restaurants, commercial food item transportation, and food storage facilities. There are no agricultural uses registered for resmethrin.
Resmethrin is a synthetic Type I pyrethroid insecticide registered for control of insects in residential, commercial and industrial settings, and in animal living areas. Resmethrin is also registered for use in food handling establishments and as a restricted use pesticide when used in ULV spray to control adult mosquitoes in the interest of public health.
PubChem : Hazardous Substances Data Bank (HSDB) · 2026-10-29 · USEPA/Office of Pesticide Programs; Reregistration Eligibility Decision Document - Resmethrinl p.82 EPA 738-R-06-003 (June 2006). Available from, as of June 9, 2009: https://www.epa.gov/pesticides/reregistration/status.htm; USEPA/Office of Prevention, Pesticides and Toxic Substances; Reregistration Eligibility Decision Document - Resmethrin p.17 EPA 738-R-06-006 (June 2006). Available from, as of May 26, 2009: https://www.epa.gov/pesticides/reregistration/status.htm.
Use classification
Pharmaceuticals
INSECTICIDES
PubChem : NORMAN Suspect List Exchange · 2026-10-29 · S72 | NTUPHTW | Pharmaceutically Active Substances from National Taiwan University | DOI:10.5281/zenodo.3955664.
PubChem : USGS Columbia Environmental Research Center · 2026-10-29 · https://www.cerc.usgs.gov/data/acute/qrychemdesc.asp?Chemical=R0040.
No natural occurrence recorded in Wikidata (LOTUS database); this does not prove that the ingredient is synthetic.
Basis: one CosIng CAS, with no natural occurrence recorded in this database.
Wikidata: names of substances in six languages and taxa in which they occur (largely from the LOTUS database), retrieved 23 October 2026.
Manufacturing
Esterification of 5-benzyl-3-furylmethyl alcohol (British patents 1168797-9) ... containing 20-30% of the (+/-)-cis isomer and 80-90% of the (+/-)-trans.
Esterification of ethereal 5-benzyl-3-furylmethyl alcohol with (+/-)-cis,trans-chrysanthemic acid chloride in benzene. After adding pyridine, and standing overnight, water is added and the organic layer washed with sulfuric acid, potassium bicarbonate, sodium chloride, dried and then distilled.
Preparation: M. Elliott, GB 1168797; idem, US 3465007 (both 1969 to National Research Development Corporation)
PubChem : Hazardous Substances Data Bank (HSDB) · 2026-10-29 · Spencer, E. Y. Guide to the Chemicals Used in Crop Protection. 7th ed. Publication 1093. Research Institute, Agriculture Canada, Ottawa, Canada: Information Canada, 1982., p. 504; Sittig M; Pest Proc Encyclop P.411 (1977); O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 2006., p. 1404.
Appearance
Colorless crystals
Waxy off-white to tan solid
Resmethrin appears as colorless crystals or waxy solid. Insoluble in water. Used as an insecticide.
Waxy white to tan solid; colorless crystals.
PubChem : Hazardous Substances Data Bank (HSDB) · 2026-10-29 · Tomlin CDS, ed. Resmethrin (10453-86-8). In: The e-Pesticide Manual, 13th Edition Version 3.1 (2004-05). Surrey UK, British Crop Protection Council.; Meister, R.T., Sine, C; Crop Protection Handbook Volume 94. Meister Media Worldwide, Willoughby, OH 2008, p. D 387.
PubChem : CAMEO Chemicals · 2026-10-29 · https://cameochemicals.noaa.gov/chemical/18218.
PubChem : Occupational Safety and Health Administration (OSHA) · 2026-10-29 · https://www.osha.gov/chemicaldata/884.
Odour described
Chrysanthemate odor
Stability
Pyrethrins ... /are/ stable for long periods in water-based aerosols where ... emulsifiers give neutral water systems. /Pyrethrins/
Stable to heat and to oxidation. Decomposes rapidly on exposure to air and light (more slowly than pyrethrins). Unstable in alkaline media.
Open Beauty Facts, export of cosmetic products, retrieved 23 October 2026.
Data “Open Beauty Facts and its contributors”, licensed under ODbL 1.0 (opendatacommons.org/licenses/odbl/1-0); derived table distributed under the same licence.
The text of the annexes
No specific rule of the EU Cosmetics Regulation names this ingredient: it is on none of its lists (prohibited, restricted, colorants, preservatives, UV filters). It may be used under the responsibility of the manufacturer, who must ensure the product is safe.
Search in Annexes II to VI. CosIng, Annex II of Regulation (EC) No 1223/2009 (prohibited substances), retrieved 23 October 2026, source updated 13 October 2026.
What has changed, and what will change
Dates of the texts that cover this ingredient. A text date may cover several substances: the details of each entry are below.
CLP classification “Acute Tox. 4 *” applicable at the latest from this date (Regulation (EU) 2018/669)
Identity
- CosIng identifier
- 59063
- CAS (according to CosIng)
- 10453-86-8
- EC (according to CosIng)
- 233-940-7
- Declared functions
- Antimicrobial
- Wikidata
- Q414562
- PubChem
- 5053
- ECHA InfoCard
- 100.030.842
- InChIKey
- VEMKTZHHVJILDY-UHFFFAOYSA-N
CosIng inventory. CosIng, inventory of cosmetic ingredients (INCI names, CAS, EC, functions), retrieved 21 October 2026.
Wikidata, items with a CosIng identifier (P3073), retrieved 22 October 2026.
Wikidata, PubChem and ECHAEuropean Chemicals Agency. links are published only when verified: same CosIng identifier, a single item, matching CAS number.
Classified hazard (CLP Regulation)
The harmonised classification is the one set by the European Union for the whole Union. H codes refer to the hazard statements of Annex III of Regulation (EC) No 1272/2008.
resmethrin (ISO);5-benzyl-3-furylmethyl (±)-cis-trans-chrysanthemate
Neither carcinogenic, mutagenic nor toxic for reproduction under the harmonised classification
- Hazard classes
- Acute toxicity, category 4 (Acute Tox. 4)
Hazardous to the aquatic environment, short term, category 1 (Aquatic Acute 1)
Hazardous to the aquatic environment, long term, category 1 (Aquatic Chronic 1) - Hazard statements
- H302 H400 H410
Annex VI, entry 613-060-00-3, linked by CAS 10453-86-8. Regulation (EC) No 1272/2008 (CLP), consolidated version, Annex VI table 3, retrieved 21 October 2026.
Entry introduced or replaced by Regulation (EU) 2018/669, applicable at the latest from 1 December 2019.
Elsewhere in the world
Information on other jurisdictions, with no effect on sale in France. What is covered, and what is not yet.
Comparison between countries
Most restrictive status in each country, and the maximum concentration cited. The details and the source of each rule follow.
| Country | Rule | Maximum concentration cited |
|---|---|---|
| European Union | No specific rule in the Cosmetics Regulation | not cited |
| United Kingdom | No specific rule in the Cosmetics Regulation | not cited |
| Switzerland | EU Regulation applies | not cited |
| United States (federal) | No federal rule recorded | not cited |
| Canada | No entry in the lists recorded | not cited |
| Japan | No entry in the lists recorded | not cited |
| South Korea | No entry in the lists recorded | not cited |
| China | Not on the prohibited lists recorded (lists of allowed substances are not recorded) | not cited |
| Australia | No entry in the lists recorded | not cited |
| ASEAN | No entry in the lists recorded | not cited |
| Taiwan | No entry in the lists recorded | not cited |
| Brazil | No entry in the lists recorded | not cited |
United Kingdom (Great Britain)
- No specific rule in the Cosmetics Regulation
Annexes II to VI in force. United Kingdom, Annexes II to VI of Regulation (EC) No 1223/2009 as retained and amended, retrieved 21 October 2026.
Contains public sector information licensed under the Open Government Licence v3.0.
Northern Ireland applies EU law.
Switzerland
Regulation (EC) No 1223/2009 applies in Switzerland (Article 54 of the Ordinance on Foodstuffs and Utility Articles).
Switzerland, FDHA Ordinance on Cosmetic Products (OCos, SR 817.023.31), consolidated version, retrieved 22 October 2026.
United States, federal rules
None of the integrated sections of the federal code (21 CFR 700.11 to 700.27 and 250.250) targets this name. The FDA does not publish a list of allowed ingredients.
United States, 21 CFR part 700 and section 250.250 (FDA rules on cosmetic ingredients), eCFR, retrieved 21 October 2026.
The eCFR is not an official legal edition of the Code of Federal Regulations.
Glossary: Commission Implementing Decision (EU) 2025/1175. Page updated on 23 October 2026.