Substance profile
Benzothiazole-2-thiol
Benzothiazole-2-thiol is pale, yellow monoclinic needles or leaflets with a disagreeable odor.
01 · Identification
What Benzothiazole-2-thiol is
Benzothiazole-2-thiol is pale, yellow monoclinic needles or leaflets with a disagreeable odor. Its molecular formula is C7H5NS2 and its molecular weight is 167.3 g/mol. It melts at 181 °C.
Under the GHS it carries the signal word Warning.
02 · Identifiers
Benzothiazole-2-thiol identifiers and molecular data
Benzothiazole-2-thiol CAS number and EC number
Benzothiazole-2-thiol molecular formula and molecular weight
03 · GHS classification
Benzothiazole-2-thiol hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Benzothiazole-2-thiol pictograms and signal word
Benzothiazole-2-thiol hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Skin sensitisation GHS chapter 3.4 | Category 1 or 1A or 1B | H317 | GHS07 |
| Hazardous to the aquatic environment - acute GHS chapter 4.1 | Category 1 | H400 | GHS09 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 1 | H410 | GHS09 |
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.
Benzothiazole-2-thiol hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H317 | May cause an allergic skin reaction. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to Benzothiazole-2-thiol. 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 Benzothiazole-2-thiol
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 Benzothiazole-2-thiol 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
Benzothiazole-2-thiol precautionary statements
CLP Annex VI assigns 8 precautionary statements to Benzothiazole-2-thiol. 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.
Disposal
What has to happen to the contents and the empty container.
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
Benzothiazole-2-thiol 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 | бензотиазол-2-тиол |
| Spanish español | Benzotiazol-2-tiol |
| Czech čeština | 2-sulfanylbenzothiazol |
| Danish dansk | benzothiazol-2-thiol |
| German Deutsch | Benzothiazol-2-thiol |
| Estonian eesti | bensotiasool-2-tiool |
| Greek ελληνικά | βενζοθειαζολο-2-θειόλη |
| English English | benzothiazole-2-thiol |
| French français | benzothiazole-2-thiol |
| Croatian hrvatski | benzotiazol-2-tiol |
| Italian italiano | benzotiazol-2-tiolo mercaptobenzotiazolo |
| Latvian latviešu | benztiazol-2-tiols |
| Lithuanian lietuvių | benztiazol-2-tiolis |
| Hungarian magyar | benzotiazol-2-tiol |
| Maltese Malti | benżotiażol-2-tiol |
| Dutch Nederlands | benzothiazool-2-thiol |
| Polish polski | benzotiazolo-2-tiol |
| Portuguese português | benzotiazole-2-tiol |
| Romanian română | benzotiazol-2-tiol |
| Slovak slovenčina | benzotiazol-2-tiol |
| Slovenian slovenščina | benzotiazol-2-tiol |
| Finnish suomi | bentsotiatsoli-2-tioli |
| Swedish svenska | bensotiazol-2-tiol |
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
Benzothiazole-2-thiol GHS label elements
Everything CLP Annex VI fixes for Benzothiazole-2-thiol, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Warning
Benzothiazole-2-thiol
- May cause an allergic skin reaction.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Avoid breathing dust/fume/gas/mist/vapours/spray.
- Contaminated work clothing should not be allowed out of the workplace.
- Avoid release to the environment.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- Get medical advice/attention.
- If skin irritation or rash occurs:
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Benzothiazole-2-thiol in the GHS label constructor →
07 · Health hazards
Benzothiazole-2-thiol health hazards and exposure limits
Benzothiazole-2-thiol hazard summary
A rubber accelerator, MBT is the most common cause of shoe allergy and second to the thiurams as the cause of glove contact dermatitis. [Marks, p. 100-2] An eye irritant; May cause skin sensitization; [ICSC] Mice show severe liver damage after high-dose feeding for 1 week; [AIHA] See Carcinogenicity of some industrial chemicals, Volume 115. [IARC, News Release, 23 February 2016]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Benzothiazole-2-thiol carcinogenicity classification
Under the conditions of these 2-year gavage studies, there was some evidence of carcinogenic activity of 2-mercaptobenzothiazole for male F344/N rats, indicated by increased incidences of mononuclear cell leukemia, pancreatic acinar cell adenomas, adrenal gland pheochromocytomas, and preputial gland adenomas or carcinomas (combined). There was some evidence of carcinogenic activity for female F344/N rats, indicated by increased incidences of adrenal gland pheochromocytomas and pituitary gland adenomas. There was no evidence of carcinogenic activity of 2-mercaptobenzothiazole for male B6C3F1 mice dosed with 375 or 750 mg/kg. There was equivocal evidence of carcinogenic activity for female B6C3F1 mice, indicated by increased incidences of hepatocellular adenomas or carcinomas (combined).
Source: US National Toxicology Program · TR-332: Toxicology and Carcinogenesis Studies of 2-Mercaptobenzothiazole (CASRN 149-30-4) in F344/N Rats and B6C3F1 Mice (Gavage Studies) (1988 )
Cancer Classification: Group C Possible Human Carcinogen
Source: Hazardous Substances Data Bank (HSDB)
An IARC group and a CLP classification answer different questions. IARC judges whether the evidence for cancer in humans is strong enough; CLP Annex VI is the legally binding EU classification. A substance can carry one and not the other.
08 · Physical and chemical properties
Benzothiazole-2-thiol 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.
Benzothiazole-2-thiol boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | Not determinable experimentally by EU Method A.2 (Boiling Temperature) due to overlapping endothermic and exothermic reactions. | HSDB | |
| Decomposes (NTP, 1992) | decomposes | CAMEO |
Benzothiazole-2-thiol melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 181 °C (357.8 °F) | DOE PAC | |
| 180.95 °C (357.7 °F) | range, midpoint shown | HSDB | |
| 171.5 °C (340.7 °F) | range, midpoint shown | HSDB |
Benzothiazole-2-thiol density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.42 g/cm³ | ICSC | |
| 1.42 g/cm³ | at 20 °C | HSDB |
Benzothiazole-2-thiol solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | In pure water, 120 mg/L at 24 °C; in buffered creek water at 24 °C, 190 mg/L (pH 6.5), 230 mg/l (pH 7.5), 260 mg/L (pH 8.5) | at 24 °C | HSDB |
| In water at 25 °C, 51 mg/L (pH 5), 118 mg/L (pH 7), 900 mg/L (pH 9) | at 25 °C | HSDB |
Benzothiazole-2-thiol vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 2.25e-8 mmHg | at 20 °C | HSDB |
| 0.000464 mmHg | Haz-Map |
Benzothiazole-2-thiol flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | 200 °C (392 °F) | CAMEO | |
| 243 °C (469.4 °F) | ICSC |
Benzothiazole-2-thiol autoignition temperature
| Property | Value | Conditions | Source |
|---|---|---|---|
| Autoignition temperature | 628 °C (1162.4 °F) | ICSC |
Benzothiazole-2-thiol lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Combustible. | HSDB | |
| Explosive limits , vol% in air: 15-? | ICSC |
Benzothiazole-2-thiol odor threshold
| Property | Value | Conditions | Source |
|---|---|---|---|
| Odor threshold | Odor Threshold Low: 2.0 [mg/m3] | Haz-Map | |
| Odor threshold from CHEMINFO | Haz-Map |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Source notes
Further notes on Benzothiazole-2-thiol
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.
Solubility
Solubility at 25 °C (g/100 mL) in alcohol: 2.0; ether 1.0; acetone 10.0; benzene 1.0; carbon tetrachloride <0.2; naphtha <0.5. Moderately soluble in glacial acetic acid. Soluble in alkalies and alkali carbonate solutions
Source: HSDB
10 · Handling and storage
Benzothiazole-2-thiol storage and handling
Benzothiazole-2-thiol safe storage
Store only in original container. Separated from acids and oxidizing materials. Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Benzothiazole-2-thiol storage conditions
Conditions for safe storage, including any incompatibilities: Keep container tightly closed in a dry and well-ventilated place.
Source: Hazardous Substances Data Bank (HSDB)
Benzothiazole-2-thiol incompatible materials
... on contact with acid or acid fumes it emits toxic /oxides of sulfur and oxides of nitrogen/.
Source: Hazardous Substances Data Bank (HSDB)
Benzothiazole-2-thiol reactivity
2-MERCAPTOBENZOTHIAZOLE is incompatible with strong oxidizing agents. Also incompatible with acids and acid fumes (NTP, 1992).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Benzothiazole-2-thiol in the storage compatibility matrix →
11 · Questions
Benzothiazole-2-thiol — frequently asked questions
What is the CAS number of Benzothiazole-2-thiol?
The CAS number of Benzothiazole-2-thiol is 149-30-4. Its EC number is 205-736-8.
What is the chemical formula of Benzothiazole-2-thiol?
The molecular formula of Benzothiazole-2-thiol is C7H5NS2 and its molecular weight is 167.3 g/mol.
What does a Benzothiazole-2-thiol label have to show?
Under CLP Annex VI the label for Benzothiazole-2-thiol carries the pictograms Exclamation mark and Environment and the signal word is Warning.
Is Benzothiazole-2-thiol flammable?
CLP Annex VI assigns Benzothiazole-2-thiol 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 200 °C (392 °F) (CAMEO).
Is Benzothiazole-2-thiol a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Benzothiazole-2-thiol. 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. IARC places it in Group 2A: probably carcinogenic to humans.
What is the boiling point of Benzothiazole-2-thiol?
The boiling point reported for Benzothiazole-2-thiol is Not determinable experimentally by EU Method A.2 (Boiling Temperature) due to overlapping endothermic and exothermic reactions. (HSDB).
What is the melting point of Benzothiazole-2-thiol?
The melting point reported for Benzothiazole-2-thiol is 181 °C (357.8 °F) (DOE PAC).
How should Benzothiazole-2-thiol be stored?
Conditions for safe storage, including any incompatibilities: Keep container tightly closed in a dry and well-ventilated place. (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to Benzothiazole-2-thiol
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