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InventoryRef 9736011/10/2019

BUTENE

1-Butene,Butylene

BUTENE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 106-98-9
CAS 106-98-9CAS 25167-67-3PubChem CID 7844

1-Butene

But-1-ene is a butene with unsaturation at position 1. — ChEBI

IUPAC name
but-1-ene
Molecular formula
C4H8
Molecular weight
56.11 g/mol
Exact mass
56.062600255 Da
XLogP3
2.4
Topological polar surface area
0.0 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
0
Covalent units
1
Defined stereocentres
0

Also known as

Ethylethylene1-Butylenealpha-ButyleneButene-1alpha-ButeneLY001N554LCHEBI:48362RefChem:6715
16 more reported names
203-449-2BUTENE1-Butene-1-13C.alpha.-Butene.alpha.-Butylene1-C4H8Isotactic poly(1-butene)Butene, 1-6993-22-2CCRIS 8970HSDB 179But-1-ene (10% in Hexanes)EINECS 203-449-2UNII-LY001N554LActipol E61-BUTENE [HSDB]
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Evidence from additional scientific databases

EMBL-EBI ChEBI
Exact identifier matchCHEBI:48362

but-1-ene

A butene with unsaturation at position 1.

Formula
C4H8
Average mass
56.108 g/mol
Monoisotopic mass
56.06260 Da
Formal charge
0
  • butene — is a (CHEBI:48361)
  • butene — is a (CHEBI:48361)
Additional curated names
but-1-ene1-butene1-butylene1-C4H8butene-1ethylethylenealpha-butenealpha-butylene
Cross-references from this source
  • CAS: 106-98-9 — NIST Chemistry WebBook
  • CAS: 106-98-9 — ChemIDplus
  • REGISTRY_NUMBER: 1098262 — Reaxys
  • REGISTRY_NUMBER: 25205 — Gmelin
  • MANUAL_X_REF: 1-Butene — Wikipedia

Mapped by: Exact CAS cross-reference in the ChEBI compound record. Source updated: 2026-08-13. Retrieved: 2026-08-31. Open source record

NIH PubChem PUG-View
Exact identifier match7844

Attributed physical-property, hazard, environmental and use annotations.

  • First Aid: EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.; SKIN: CAUTION: Exposure of skin to compressed gases may result in freezing of the skin. Treatment for frostbite may be necessary. Remove the victim from the source of contamination. IMMEDIATELY wash affected areas gently with COLD water (and soap, if necessary) while removing and isolating all contaminated clothing. Dry carefully with clean, soft towels. If symptoms such as inflammation or irritation develop, IMMEDIATELY call a physician or go to a hospital for treatment.; INHALATION: IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a ho Source: CAMEO Chemicals
  • Signal: Danger Source: Regulation (EC) No 1272/2008 of the European Parliament and of the Council
  • GHS Hazard Statements: H220: Extremely flammable gas [Danger Flammable gases] Source: Regulation (EC) No 1272/2008 of the European Parliament and of the Council
  • Precautionary Statement Codes: P203, P210, P222, P280, P377, P381, and P403 (click each P-code to see the statement) Source: Regulation (EC) No 1272/2008 of the European Parliament and of the Council
  • Note: This chemical does not meet GHS hazard criteria for 0.1% (2 of 1383) of reports. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: H220 (99.6%): Extremely flammable gas [Danger Flammable gases]; H280 (65.7%): Contains gas under pressure; may explode if heated [Warning Gases under pressure] Source: European Chemicals Agency (ECHA)
  • Precautionary Statement Codes: P203, P210, P222, P280, P377, P381, P403, and P410+P403 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
  • ECHA C&L Notifications Summary: Aggregated GHS information provided per 1383 reports by companies from 17 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 2 of 1383 reports by companies.; There are 16 notifications provided by 1381 of 1383 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
  • Note: This chemical does not meet GHS hazard criteria for 0.3% (1 of 399) of reports. Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: H220 (99.5%): Extremely flammable gas [Danger Flammable gases]; H280 (95.2%): Contains gas under pressure; may explode if heated [Warning Gases under pressure] Source: European Chemicals Agency (ECHA)
  • ECHA C&L Notifications Summary: Aggregated GHS information provided per 399 reports by companies from 4 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 1 of 399 reports by companies.; There are 3 notifications provided by 398 of 399 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: NITE-CMC
  • Toxicity Summary: IDENTIFICATION AND USE: 1-Butene is a colorless gas. It is is used for the production of a wide variety of chemicals in the gasoline and rubber processing areas. Most 1-butene is used as a comonomer for linear low-density polyethylene, which contains up to 10%. However, 1-butene is also used as a comonomer for modifying high-density polyethylene, which contains up to 4%. HUMAN STUDIES: 1-Butene is a simple asphyxiant and may be a CNS depressant in high concentrations. It has a low acute toxicity and is mildly irritating to the eye. On direct eye and skin contact liquid butene can cause burns and frostbite. The treatment of human peripheral blood mononuclear cells (PBMCs) and promyelocytic leukemia cells (HL60) for 24 hr resulted in an increase of DNA damage. HL60 cells were more resistant than PBMCs to the DNA damage. ANIMAL STUDIES: Exposure to 1-butene at target concentrations of 500, 2000, 8000 ppm (approximately 1147, 4589, 18359 mg/cu m) did not induce systemic toxicity in male and female rats exposed for 28 days or in pregnant female rats exposed for 14 days pre-mating, through mating and gestation to day 19. There were no treatment-related effects on the development of pups. Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Bioconcentration: An estimated BCF of 18 was calculated in fish for 1-butene(SRC), using a log Kow of 2.40(1) and a regression-derived equation(2). According to a classification scheme(3), this BCF suggests the potential for bioconcentration in aquatic organisms is low(SRC). Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 120(SRC), determined from a log Kow of 2.40(2) and a regression-derived equation(3), indicates that 1-butene is expected to have high mobility in soil(SRC). Volatilization of 1-butene from moist soil surfaces is expected to be an important fate process(SRC) given a Henry's Law constant of 2.33X10-1 atm-cu m/mole(4). 1-Butene is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 2250 at 25 °C(5). Utilizing the Japanese MITI test, 3% of the Theoretical BOD was reached in 4 weeks(6) indicating that biodegradation is not an important environmental fate process in soil(SRC). However, alkenes can be utilized by a wide range of microorganisms and are catabolized via several routes, resulting in the unsaturated alcohol, aldehyde and fatty acid or the formation of epoxide, diol compounds and possibly hydroxyacids(7). Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 120(SRC), determined from a log Kow of 2.40(2) and a regression-derived equation(3), indicates that 1-butene is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(4) based upon a Henry's Law constant of 2.33X10-1 atm-cu m/mole(5). Using this Henry's Law constant and an estimation method(4), volatilization half-lives for a model river and model lake are 2 hours and 3 days, respectively(SRC). According to a classification scheme(6), an estimated BCF of 18(SRC), from its log Kow(2) and a regression-derived equation(3), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Utilizing the Japanese MITI test, 3% of the Theoretical BOD was reached in 4 weeks(7) indicating that biodegradation is not an important environmental fate process in water(SRC). However, alkenes can be utilized by a wide range of microorganisms and are catabolized via several routes, resulting in the unsaturated alcohol, aldehyde and fatty acid or the formation of epoxide, diol compounds and possibly hydroxyacids(8). Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 1-butene, which has a vapor pressure of 2.25X10+3 mm Hg at 25 °C(2), is expected to exist solely as a gas in the ambient atmosphere. Gas-phase 1-butene is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 12 hours(SRC), calculated from its rate constant of 3.14X10-11 cu cm/molecule-sec at 25 °C(3). The rate constant for the vapor-phase reaction of 1-butene with ozone has been estimated as 1.2X10-17 cu cm/molecule-sec at 25 °C(SRC) that was derived using a structure estimation method(4). This corresponds to an atmospheric half-life of about 23 hours at an atmospheric concentration of 7X10+11 ozone molecules per cu cm(5). Products from this reaction are formic and propionic acid(6). Based on a half-life of 149 hours, from and average rate constant of 5.4X10-15 cu cm/molec-sec(7,8), night-time degradation by the reaction with nitrate radicals is not expected to be a significant removal process. 1-Butene does not contain chromophores that absorb at wavelengths >290 Source: Hazardous Substances Data Bank (HSDB)
  • Uses: /1-Butene/ is used for the production of a wide variety of chemicals in the gasoline and rubber processing industries. Source: Hazardous Substances Data Bank (HSDB)
  • Uses: Most high-purity 1-butene is used as a comonomer for linear low-density polyethylene (LLDPE) and for modifying high-density polyethylene (HDPE), which contains up to 4%. Source: Hazardous Substances Data Bank (HSDB)
  • Uses: COMONOMER FOR HIGH DENSITY POLYETHYLENE FOR BLOW-MOLDING RESINS; MONOMER FOR POLYBUTENE USED IN PLASTIC PIPE & FILM; INT FOR 1,2-BUTYLENE OXIDE Source: Hazardous Substances Data Bank (HSDB)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status
SourceResultChecked
EMBL-EBI ChEBIExact match2026-08-31
NIH PubChem PUG-ViewExact match2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for BUTENE

INCI name

BUTENE

Description

1-Butene,Butylene

Record provenance

Inventory reference
97360
Imported identity
BUTENE
Source update
11/10/2019
European Commission CosIng source notes
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Key data

CAS
106-98-9; 25167-67-3
EC
203-449-2; 246-689-3
Restriction
—
Function
NOT REPORTED
No function currently reported.

Ingredients with overlapping formulation functions

BLUE SCORPION VENOMANTI-SEBORRHEIC; ANTIOXIDANT; SKIN PROTECTING; NOT REPORTED
BORONOPHENYLALANINE HCLNOT REPORTED
BUDDLEJA DAVIDII CALLUS EXTRACTNOT REPORTED
BUTADIENENOT REPORTED
BUTENEDIOLNOT REPORTED
BUTYL MALEATENOT REPORTED
BUTYLDIMETHICONYL PROPOXYETHYLCARBAMOYLPROPYL SILSESQUIOXANENOT REPORTED
C1-18 ALKYL ACRYLATENOT REPORTED

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How BUTENE appears in the CosIng inventory

The CosIng inventory lists BUTENE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

BUTENE is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

BUTENE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, BUTENE carries the following function designation(s):

CAS 106-98-9; 25167-67-3 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for BUTENE

This page reproduces the CosIng inventory entry for BUTENE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research BUTENE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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