Substance profile
Di-tert-butyl peroxide
Di-tert-butyl peroxide is a clear, water-white liquid.
01 · Identification
What Di-tert-butyl peroxide is
Di-tert-butyl peroxide is a clear, water-white liquid. Its molecular formula is C8H18O2 and its molecular weight is 146.23 g/mol. It boils at 111 °C, melts at -40 °C.
Under the GHS it carries the signal word Danger. It is classed as flammable agents - 3rd degree.
02 · Identifiers
Di-tert-butyl peroxide identifiers and molecular data
Di-tert-butyl peroxide CAS number and EC number
Di-tert-butyl peroxide molecular formula and molecular weight
03 · GHS classification
Di-tert-butyl peroxide hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Di-tert-butyl peroxide pictograms and signal word
Di-tert-butyl peroxide hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Flammable liquids GHS chapter 2.6 | Category 2 | H225 | GHS02 |
| Organic peroxides or Self-reactive substances and mixtures | Category Type C and D or Type E and F | H242 | GHS02 |
| Germ cell mutagenicity GHS chapter 3.5 | Category 2 | H341 | GHS08 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Di-tert-butyl peroxide hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H225 | Highly flammable liquid and vapour. |
| H242 | Heating may cause a fire. |
| H341 | Suspected of causing genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
This page lists only the codes assigned to Di-tert-butyl peroxide. 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 Di-tert-butyl peroxide
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 Di-tert-butyl peroxide 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
Di-tert-butyl peroxide precautionary statements
CLP Annex VI assigns 9 precautionary statements to Di-tert-butyl peroxide. 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
Di-tert-butyl peroxide 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 | ди- трет -бутилпероксид |
| Spanish español | Peróxido de di- terc -butilo |
| Czech čeština | di- terc -butylperoxid |
| Danish dansk | di- tert -butylperoxid |
| German Deutsch | Di- tert -butylperoxid |
| Estonian eesti | di- tert -butüülperoksiid |
| Greek ελληνικά | δι- tert -βουτυλοϋπεροξείδιο |
| English English | di- tert -butyl peroxide |
| French français | péroxyde de di- tert -butyle |
| Croatian hrvatski | di- tert -butil peroksid |
| Italian italiano | perossido di butile terziario terz -butil-perossido |
| Latvian latviešu | di- terc -butilperoksīds |
| Lithuanian lietuvių | di- tret -butilperoksidas |
| Hungarian magyar | di( terc -butil)-peroxid |
| Maltese Malti | perossidu ta’ di-terz-butil |
| Dutch Nederlands | di- tert -butylperoxide |
| Polish polski | nadtlenek di-tert-butylu |
| Portuguese português | peróxido de di- terc -butilo |
| Romanian română | peroxid de di- terț -butil |
| Slovak slovenčina | di- terc -butylperoxid |
| Slovenian slovenščina | di- terc -butil peroksid |
| Finnish suomi | di- tert -butyyliperoksidi |
| Swedish svenska | di- tert -butylperoxid |
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
Di-tert-butyl peroxide GHS label elements
Everything CLP Annex VI fixes for Di-tert-butyl peroxide, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Di-tert-butyl peroxide
- Highly flammable liquid and vapour.
- Heating may cause a fire.
- Suspected of causing genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
- Obtain special instructions before use.
- Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
- Keep container tightly closed.
- Use explosion-proof [electrical/ventilating/lighting/…] equipment.
- Use only non-sparking tools.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF exposed or concerned:
- Get medical advice/attention.
- Store in a well-ventilated place.
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Di-tert-butyl peroxide in the GHS label constructor →
07 · Health hazards
Di-tert-butyl peroxide health hazards and exposure limits
Di-tert-butyl peroxide hazard summary
Caused muscle weakness and ataxia after intraperitoneal lethal-dose studies of rats; Mild irritant effect when administered into eyes of rabbits; [RTECS] Fire hazard; Strong oxidizer; [Hawley] A skin and mucous membrane irritant; Corrosive to eyes; [HSDB] An eye and respiratory tract irritant; [ICSC] May cause irritation; [MSDSonline]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · Physical and chemical properties
Di-tert-butyl peroxide 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.
Di-tert-butyl peroxide boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 111 °C (231.8 °F) | HSDB | |
| 111.11 °C (232 °F) | at 760 mmHg | CAMEO | |
| 111 °C (231.8 °F) | at 760 mmHg | DOE PAC |
Di-tert-butyl peroxide melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | -40 °C (-40 °F) | HSDB | |
| -29 °C (-20.2 °F) | HSDB |
Di-tert-butyl peroxide density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 0.8 g/cm³ | ICSC | |
| 0.704 g/cm³ | at 20 °C | CAMEO | |
| 0.791 g/cm³ | at 25 °C | HSDB |
Di-tert-butyl peroxide solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Insoluble in water | HSDB | |
| In water, 1.71 mg/L at 20 °C, pH 8.1 | at 20 °C | HSDB | |
| In water, 100 mg/L at 25 °C | at 25 °C | HSDB |
Di-tert-butyl peroxide vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 19.51 mmHg | at 20 °C | CAMEO |
| 19.5016 mmHg | at 20 °C | ICSC | |
| 25.1 mmHg | at 25 °C, calculated from experimentally derived coefficients | HSDB |
Di-tert-butyl peroxide flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | 1 °C (33.8 °F) | HSDB | |
| 18.33 °C (65 °F) | HSDB | ||
| 12 °C (53.6 °F) | HSDB |
Di-tert-butyl peroxide lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Vapor/air mixtures are explosive. | HSDB | |
| Prevention: Closed system, ventilation, explosion-proof electrical equipment and lighting. Do not use compressed air for filling, discharging, or handling. | HSDB |
Di-tert-butyl peroxide vapor density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor density | 5.03 (air = 1) | HSDB | |
| 5 (air = 1) | ICSC |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Di-tert-butyl peroxide 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.
Di-tert-butyl peroxide fire potential
Flammable liquid.
Source: Hazardous Substances Data Bank (HSDB)
Fire and explosion
Seven organic peroxides were tested for propagation and power of explosion, and for shock sensitivity. Tert-butylperoxybenzoate and dibenzoylperoxide showed high shock sensitivity and explosive powers of 40 and 25% of TNT respectively. Di-tert-butylperoxide showed medium sensitivity and a power of 30% TNT. Cumyl hydroperoxide (80% in cumene), dibenzoylperoxide (75% in water), dicumyl peroxide and dilauroyl peroxide did not propagate explosion.
Source: HSDB
10 · Handling and storage
Di-tert-butyl peroxide storage and handling
Di-tert-butyl peroxide safe storage
Fireproof. Separated from combustible substances and reducing agents. Cool. Well closed.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Di-tert-butyl peroxide storage conditions
Store in original container. Keep container tightly closed in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage. Recommended storage temperature 2 - 8 °C. Storage class (TRGS 510): Organic peroxides and self-reacting hazardous materials.
Source: Hazardous Substances Data Bank (HSDB)
Di-tert-butyl peroxide incompatible materials
Incompatible materials: Strong reducing agents, powdered metals, strong bases.
Source: Hazardous Substances Data Bank (HSDB)
Di-tert-butyl peroxide reactivity
The explosive instability of the lower dialkyl peroxides (e.g., dimethyl peroxide) and 1,1-bis-peroxides decreases rapidly with increasing chain length and degree of branching, the di-tert-alkyl derivatives being amongst the most stable class of peroxides. Though many 1,1-bis-peroxides have been reported, few have been purified because of the higher explosion hazards compared with the monofunctional peroxides. It is unlikely that this derivative would be particularly unstable compared to other peroxides in its class [Bretherick 2nd ed., p 44 1979].
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Di-tert-butyl peroxide in the storage compatibility matrix →
11 · Questions
Di-tert-butyl peroxide — frequently asked questions
What is the CAS number of Di-tert-butyl peroxide?
The CAS number of Di-tert-butyl peroxide is 110-05-4. Its EC number is 203-733-6.
What is the chemical formula of Di-tert-butyl peroxide?
The molecular formula of Di-tert-butyl peroxide is C8H18O2 and its molecular weight is 146.23 g/mol.
What does a Di-tert-butyl peroxide label have to show?
Under CLP Annex VI the label for Di-tert-butyl peroxide carries the pictograms Flame and Health hazard and the signal word is Danger.
Is Di-tert-butyl peroxide flammable?
Yes. CLP Annex VI assigns Di-tert-butyl peroxide H225 and H242 — highly flammable liquid and vapour. The flash point reported for it is 1 °C (33.8 °F) (HSDB).
Is Di-tert-butyl peroxide a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Di-tert-butyl peroxide. 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 boiling point of Di-tert-butyl peroxide?
The boiling point reported for Di-tert-butyl peroxide is 111 °C (231.8 °F) (HSDB).
What is the melting point of Di-tert-butyl peroxide?
The melting point reported for Di-tert-butyl peroxide is -40 °C (-40 °F) (HSDB).
How should Di-tert-butyl peroxide be stored?
CLP Annex VI assigns Di-tert-butyl peroxide the storage statement P403. Store in original container. Keep container tightly closed in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage. Recommended storage temperature 2 - 8 °C. Storage class (TRGS 510): Organic peroxides and self-reacting hazardous materials. (Hazardous Substances Data Bank (HSDB))
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