2-methylbut-1-ene is an alkene that is but-1-ene carrying a methyl substituent at position 2.
Definition
US FDA substance register · UNII F238I92ISV · registered name METHYLBUTENE (MIXED ISOMERS) · mixture
2-methylbut-1-ene is an alkene that is but-1-ene carrying a methyl substituent at position 2.
Source: PubChem
Cosmetic roles
Safety & regulatory references
Not classified under Korea’s toxic-substance GHS list
More data — names, identifiers, properties, test records, literature
Names & identifiers
- CAS No.chemical registry number
- 26760-64-5
- CAS No.chemical registry number
- 513-35-9
- EC No.EU chemical inventory number
- 208-156-3
- EC No.EU chemical inventory number
- 247-975-0
- DTXSIDUS EPA chemical ID
- DTXSID1040249
Measured properties
- Appearance
- Isopentenes appears as a colorless liquid with a pleasant odor. A mixture of isomers. Insoluble in water and less dense than water. Hence floats on water. Vapors are heavier than air. Used as a solvent and to make other chemicals. · 2-methyl-1-butene appears as a colorless volatile liquid with a disagreeable odor. Insoluble in water and less dense than water. Vapors are heavier than air. Used to make other chemicals.
- Odour
- Disagreeable odor
- Boiling point
- 31.2 °C · 31.04 °C @760 [mm Hg]
- Melting point
- -137.5 °C
- Solubility
- Sol in alcohol, ether, benzene · In water, 130 mg/l @ 20 °C.
- Density
- 0.6504 @ 20 °C/4 °C · 0.06504 @ 20°C
- Stability
- VOLATILE
- Melting/freezing point
- -134 ℃
- Initial boiling point and range
- 34.5~36 ℃
- Flash point
- -45 ℃
- Vapour pressure
- 62.39 ㎪ (at 25°C)
- Water solubility
- 193 ㎎/ℓ (at 25°C)
- Relative density
- 0.66 (20℃)
- n-Octanol/water partition coefficient (Kow)
- 2.67
- Auto-ignition temperature
- 290 ℃
- Molecular weight
- 70.14
Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.
Source: PubChem · KOSHA safety data sheets (Korea)
What products actually use it for
What the 2 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.
- Solvent1
- Intermediate1
Source: US EPA CompTox dashboard
Irritation and sensitisation studies
2 skin studies and 1 eye studies are on record.
The studies disagree (the most common conclusion covers 50%), so they do not establish that this ingredient is irritating. These tests are on the raw material itself; irritation at the amount in a finished product is a different question.
See all 3 studies
- Not likely to be sensitizing
skin sensitisation: in vivo (non-LLNA) · Screening · equivalent or similar to OECD Guideline 406 (Skin Sensitisation) - Severe Irritation
skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) equivalent or similar to - Studies Indicate No Significant Irritation
eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) equivalent or similar to
Source: US EPA CompTox dashboard
Linked databases 12
- Australian Industrial Chemicals Inventory (AICIS)
- EU CosIng ingredient list 2
- Korea Cosmetic Association ingredient dictionary
- Korea toxic substances GHS register (NIER)
- KOSHA safety data sheets (Korea)
- MFDS (Korea) cosmetic ingredient register 2
- PubChem 2
- UniChem cross-reference IDs
- US EPA CompTox dashboard
- US EPA DSSTox chemical database
- US FDA substance registration (GSRS)
- US FDA Unique Ingredient Identifier (UNII)