Substance profile
2-methylpentane-2,4-diol
2-methylpentane-2,4-diol is a liquid with a mild sweetish odor.
01 · Identification
What 2-methylpentane-2,4-diol is
2-methylpentane-2,4-diol is a liquid with a mild sweetish odor. Its molecular formula is C6H14O2 and its molecular weight is 118.17 g/mol. It boils at 198 °C, melts at -50 °C, is miscible with water.
Under the GHS it carries the signal word Warning. It is classed as flammable agents - 2nd degree.
02 · Identifiers
2-methylpentane-2,4-diol identifiers and molecular data
2-methylpentane-2,4-diol CAS number and EC number
2-methylpentane-2,4-diol molecular formula and molecular weight
03 · GHS classification
2-methylpentane-2,4-diol hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
2-methylpentane-2,4-diol pictograms and signal word
2-methylpentane-2,4-diol hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Skin corrosion/irritation GHS chapter 3.2 | Category 2 | H315 | GHS07 |
| Serious eye damage/eye irritation GHS chapter 3.3 | Category 2A | H319 | GHS07 |
2-methylpentane-2,4-diol hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H315 | Causes skin irritation. |
| H319 | Causes serious eye irritation. |
This page lists only the codes assigned to 2-methylpentane-2,4-diol. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for 2-methylpentane-2,4-diol
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of 2-methylpentane-2,4-di… issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
2-methylpentane-2,4-diol precautionary statements
CLP Annex VI assigns 9 precautionary statements to 2-methylpentane-2,4-diol. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
2-methylpentane-2,4-diol name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | 2-метилпентан-2,4-диол |
| Spanish español | 2-Metilpentano-2,4-diol |
| Czech čeština | 2-methylpentan-2,4-diol |
| Danish dansk | 2-methyl-2,4-pentandiol |
| German Deutsch | 2-Methyl-2,4-pentandiol |
| Estonian eesti | 2-metüülpentaan-2,4-diool |
| Greek ελληνικά | 2-μεθυλοπεντανο-2,4-διόλη |
| English English | 2-methylpentane-2,4-diol |
| French français | 2-méthylpentane-2,4-diol |
| Croatian hrvatski | 2-metilpentan-2,4-diol |
| Italian italiano | 2-metil-2,4-pentandiolo |
| Latvian latviešu | 2-metilpentān-2,4-diols |
| Lithuanian lietuvių | 2-metil-2,4-pentandiolis |
| Hungarian magyar | 2-metilpentán-2,4-diol |
| Maltese Malti | 2-metilpentan-2,4-diol |
| Dutch Nederlands | 2-methylpentaan-2,4-diol |
| Polish polski | 2-metylopentano-2,4-diol glikol heksylenowy |
| Portuguese português | 2-metil-2,4-pentanodiol |
| Romanian română | 2-metilpentan-2,4-diol |
| Slovak slovenčina | 2-metylpentán-2,4-diol |
| Slovenian slovenščina | 2-metilpentan-2,4-diol |
| Finnish suomi | 2-metyyli-2,4-pentaanidioli |
| Swedish svenska | 2-metylpentan-2,4-diol |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
2-methylpentane-2,4-diol GHS label elements
Everything CLP Annex VI fixes for 2-methylpentane-2,4-diol, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Warning
2-methylpentane-2,4-diol
- Causes skin irritation.
- Causes serious eye irritation.
- Wash … thoroughly after handling.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF ON SKIN:
- IF IN EYES:
- Get medical advice/attention.
- If skin irritation occurs:
- If eye irritation persists:
- Remove contact lenses, if present and easy to do. Continue rinsing.
- Wash with plenty of water/…
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open 2-methylpentane-2,4-diol in the GHS label constructor →
07 · Health hazards
2-methylpentane-2,4-diol health hazards and exposure limits
2-methylpentane-2,4-diol hazard summary
At 1000 ppm for 5 minutes, human subjects complain of eye, throat, and respiratory irritation. Oral dosing causes central nervous system depression in experimental animals. Limited animal and human data suggesting a potential for skin sensitization were insufficient to support a DSEN notation. [ACGIH] Allergic contact dermatitis may occur; [Reference #1] A skin, eye, and respiratory tract irritant; [ICSC]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
2-methylpentane-2,4-diol occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | none See Appendix G | The National Institute for Occupational Safety and Health (NIOSH) |
| REL | 25 ppm (125 mg/m³) | Occupational Safety and Health Administration (OSHA) |
| REL | C 25 ppm (125 mg/m3) | The National Institute for Occupational Safety and Health (NIOSH) |
| IDLH | N.D. | The National Institute for Occupational Safety and Health (NIOSH) |
These are United States values. The European Union sets its own indicative and binding limits, and the figure that applies at a given workplace is the one in the local regulation — not the one shown here.
08 · Physical and chemical properties
2-methylpentane-2,4-diol properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
2-methylpentane-2,4-diol boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 198 °C (388.4 °F) | at 760 mmHg | HSDB |
| 197.78 °C (388 °F) | NIOSH | ||
| 197.22 °C (387 °F) | at 760 mmHg | CAMEO |
2-methylpentane-2,4-diol melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | -50 °C (-58 °F) | glass or vitreous condition | HSDB |
| -50 °C (-58 °F) | NIOSH |
2-methylpentane-2,4-diol density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 0.9215 g/cm³ | HSDB | |
| 0.92 g/cm³ | NIOSH | ||
| 0.9211 g/cm³ | at 20 °C | HSDB |
2-methylpentane-2,4-diol solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Miscible with water | HSDB | |
| Soluble in alcohol, ether, lower aliphatic hydrocarbons | HSDB | ||
| Soluble in ethanol, ethyl ether; slightly soluble in carbon tetrachloride | HSDB |
2-methylpentane-2,4-diol vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 0.05 mmHg | NIOSH | |
| 0.013 mmHg | at 25 °C | HSDB | |
| 0.07 mmHg | at 25 °C | HSDB |
2-methylpentane-2,4-diol flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | 93 °C (199.4 °F) | closed cup | HSDB |
| 96.11 °C (205 °F) | HSDB | ||
| 98.33 °C (209 °F) | NIOSH |
2-methylpentane-2,4-diol autoignition temperature
| Property | Value | Conditions | Source |
|---|---|---|---|
| Autoignition temperature | 305.85 °C (582.5 °F) | HSDB | |
| 306.11 °C (583 °F) | CAMEO | ||
| 306 °C (582.8 °F) | ICSC |
2-methylpentane-2,4-diol lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | 1.3 % by volume | NIOSH | |
| 1.2 % by volume | calc. | CAMEO | |
| 1.2 % by volume | ICSC |
2-methylpentane-2,4-diol upper explosive limit (UEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Upper explosive limit (UEL) | 7.4 % by volume | NIOSH | |
| 8.1 % by volume | calc. | CAMEO | |
| 8.1 % by volume | ICSC |
2-methylpentane-2,4-diol vapor density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor density | 4.1 (air = 1) | ICSC |
2-methylpentane-2,4-diol odor threshold
| Property | Value | Conditions | Source |
|---|---|---|---|
| Odor threshold | Odor Threshold Low: 3.93 [ppm] | Haz-Map | |
| Odor threshold of 3.93 reported | Haz-Map |
2-methylpentane-2,4-diol critical temperature and pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Critical temperature and pressure | 347.85 °C (658.1 °F) | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
2-methylpentane-2,4-diol fire and explosion behaviour
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
2-methylpentane-2,4-diol fire potential
Combustible.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
2-methylpentane-2,4-diol storage and handling
2-methylpentane-2,4-diol safe storage
Separated from strong oxidants and strong acids.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
2-methylpentane-2,4-diol storage conditions
Keep container tightly closed in a dry and well-ventilated place. Store under inert gas. hygroscopic
Source: Hazardous Substances Data Bank (HSDB)
2-methylpentane-2,4-diol incompatible materials
Can react with oxidizing materials.
Source: Hazardous Substances Data Bank (HSDB)
2-methylpentane-2,4-diol reactivity
HEXYLENE GLYCOL is incompatible with the following: Strong oxidizers, strong acids [Note: Hygroscopic (i.e., absorbs moisture from the air).] (NIOSH, 2024).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check 2-methylpentane-2,4-diol in the storage compatibility matrix →
11 · Questions
2-methylpentane-2,4-diol — frequently asked questions
What is the CAS number of 2-methylpentane-2,4-diol?
The CAS number of 2-methylpentane-2,4-diol is 107-41-5. Its EC number is 203-489-0.
What is the chemical formula of 2-methylpentane-2,4-diol?
The molecular formula of 2-methylpentane-2,4-diol is C6H14O2 and its molecular weight is 118.17 g/mol.
What does a 2-methylpentane-2,4-diol label have to show?
Under CLP Annex VI the label for 2-methylpentane-2,4-diol carries the pictogram Exclamation mark and the signal word is Warning.
Is 2-methylpentane-2,4-diol flammable?
CLP Annex VI assigns 2-methylpentane-2,4-diol no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it. The flash point reported for it is 93 °C (199.4 °F), closed cup (HSDB).
Is 2-methylpentane-2,4-diol a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for 2-methylpentane-2,4-diol. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the exposure limit for 2-methylpentane-2,4-diol?
The US occupational exposure limit reported for 2-methylpentane-2,4-diol is none See Appendix G (The National Institute for Occupational Safety and Health (NIOSH)). Limits differ by country: the EU sets its own indicative and binding values, and the figure that applies at a given workplace is the one in the local regulation.
What is the boiling point of 2-methylpentane-2,4-diol?
The boiling point reported for 2-methylpentane-2,4-diol is 198 °C (388.4 °F), at 760 mmHg (HSDB).
What is the melting point of 2-methylpentane-2,4-diol?
The melting point reported for 2-methylpentane-2,4-diol is -50 °C (-58 °F), glass or vitreous condition (HSDB).
How should 2-methylpentane-2,4-diol be stored?
Keep container tightly closed in a dry and well-ventilated place. Store under inert gas. hygroscopic (Hazardous Substances Data Bank (HSDB))
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