Substance profile
Fenchlorphos
Fenchlorphos is colorless crystals with a mercaptan odor.
01 · Identification
What Fenchlorphos is
Fenchlorphos is colorless crystals with a mercaptan odor. Its molecular formula is C8H8Cl3O3PS and its molecular weight is 321.5 g/mol. It melts at 41 °C.
Under the GHS it carries the signal word Warning.
02 · Identifiers
Fenchlorphos identifiers and molecular data
Fenchlorphos CAS number and EC number
Fenchlorphos molecular formula and molecular weight
Other names for Fenchlorphos
- fenchlorphos (ISO)
- O,O-dimethyl O-2,4,5-trichlorophenyl phosphorothioate
03 · GHS classification
Fenchlorphos hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Fenchlorphos pictograms and signal word
Fenchlorphos hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Acute toxicity - oral GHS chapter 3.1 | Category 4 | H302 | GHS07 |
| Acute toxicity - dermal GHS chapter 3.1 | Category 4 | H312 | 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 |
Fenchlorphos hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H312 | Harmful in contact with skin. |
| H302 | Harmful if swallowed. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to Fenchlorphos. 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 Fenchlorphos
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 Fenchlorphos 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
Fenchlorphos precautionary statements
CLP Annex VI assigns 10 precautionary statements to Fenchlorphos. 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
Fenchlorphos 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 | фенхлорфос (ISO) O, O -диметилов O -2,4,5-трихлорофенилов фосфоротиоат |
| Spanish español | Fenclorfós (ISO) fosforotioato de O, O -dimetilo y O -2,4,5-triclorofenilo |
| Czech čeština | fenchlorfos (ISO) O, O -dimethyl- O -(2,4,5-trichlorfenyl)-fosforothioát |
| Danish dansk | fenchlorphos (ISO) O, O- dimethyl- O- 2,4,5-trichlorphenylthiophosphat |
| German Deutsch | Fenchlorphos (ISO) O, O -Dimethyl- O -2,4,5-trichlorphenylphosphorothioat |
| Estonian eesti | fenklorofoss (ISO) O , O -dimetüül- O -2,4,5-triklorofenüülfosforotioaat |
| Greek ελληνικά | fenchlorphos (φαινχλωροφός) (ISO) θειοφωσφορικό O, O -διμεθύλιο O -2,4,5-τριχλωροφαινύλιο |
| English English | fenchlorphos (ISO) O, O -dimethyl O -2,4,5-trichlorophenyl phosphorothioate |
| French français | fenchlorphos (ISO) phosphorothioate de O, O -diméthyle et de O -2,4,5-trichlorophényle |
| Croatian hrvatski | fenklorfos (ISO) O, O -dimetil- O -2,4,5-triklorfenil-fosforotioat |
| Italian italiano | fenclorfos (ISO) tiofosfato di O-2,4,5-triclorofenile e O, O-dimetile |
| Latvian latviešu | fenhlorfoss (ISO) O, O -dimetil- O -2,4,5-trihlorfenilfosfortioāts |
| Lithuanian lietuvių | fenchlorfosas (ISO) O, O -dimetil- O -2,4,5-trichlorfeniltiofosfatas |
| Hungarian magyar | fenklórfosz (ISO) O, O -dimetil O -2,4,5-triklórfenil-tiofoszfát |
| Maltese Malti | fenklorfos (ISO) fosforotijoat ta’ O, O-dimetil O-2,4,5-triklorofenil |
| Dutch Nederlands | fenchloorfos (ISO) O, O -dimethyl- O -2,4,5-trichloorfenylthiofosfaat |
| Polish polski | fenchlorfos (ISO) tiofosforan O , O -dimetylu- O -2,4,5-trichlorofenylu |
| Portuguese português | fenclorfos (ISO) tiofosfato de O , O -dimetilo e de O -2,4,5-triclorofenilo |
| Romanian română | fenclorfos (ISO) tiofosfat de O, O -dimetil și de O -2,4,5-triclorofenil |
| Slovak slovenčina | fenchlórfos (ISO) O, O -dimetyl- O -(2,4,5-trichlórfenyl)-fosforotioát |
| Slovenian slovenščina | fenklorfos (ISO) O, O -dimetil O -2,4,5-triklorofenil fosforotioat |
| Finnish suomi | fenklorfossi (ISO) O , O -dimetyyli- O -2,4,5-trikloorifenyylifosforotioaatti |
| Swedish svenska | fenklorfos (ISO) O, O -dimetyl- O -2,4,5-triklorfenylfosfortioat |
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
Fenchlorphos GHS label elements
Everything CLP Annex VI fixes for Fenchlorphos, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Warning
Fenchlorphos
- Harmful in contact with skin.
- Harmful if swallowed.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Do not eat, drink or smoke when using this product.
- Avoid release to the environment.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- IF ON SKIN:
- Call a POISON CENTER/doctor/… if you feel unwell.
- Rinse mouth.
- Wash with plenty of water/…
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Fenchlorphos in the GHS label constructor →
07 · Health hazards
Fenchlorphos health hazards and exposure limits
Fenchlorphos hazard summary
Ronnel is corrosive to the skin. [AHLS, p. 105] The average of two baseline respective cholinesterase activity determinations three days apart, with no exposures to enzyme inhibiting pesticides for at least 30 days, is recommended for each worker prior to exposure to cholinesterase inhibitors because of large inter-individual differences in published baseline values. To be established at least once a year. Removal from workplace exposures is recommended until the cholinesterase activity returns to within 20% of baseline. [TLVs and BEIs]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Fenchlorphos occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | 15.0 [mg/m3] | Haz-Map, Information on Hazardous Chemicals and Occupational Diseases |
| PEL | 15 mg/m³ | Occupational Safety and Health Administration (OSHA) |
| PEL | TWA 15 mg/m3 See Appendix G | The National Institute for Occupational Safety and Health (NIOSH) |
| REL | 10 mg/m³ | Occupational Safety and Health Administration (OSHA) |
| REL | TWA 10 mg/m3 | The National Institute for Occupational Safety and Health (NIOSH) |
| IDLH | 300 mg/m3 (NIOSH, 2024) | CAMEO Chemicals |
| IDLH | 300.0 [mg/m3] | Haz-Map, Information on Hazardous Chemicals and Occupational Diseases |
| IDLH | 300 mg/cu m | Hazardous Substances Data Bank (HSDB) |
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
Fenchlorphos 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.
Fenchlorphos boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 97 °C (206.6 °F) | at 0.0097508 mmHg (reduced pressure) | HSDB |
| BP: decomposes. | decomposes | HSDB | |
| Decomposes | decomposes | NIOSH |
Fenchlorphos melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 41 °C (105.8 °F) | HSDB | |
| 41.11 °C (106 °F) | NIOSH |
Fenchlorphos density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.48 g/cm³ | ICSC | |
| 1.485 g/cm³ | at 25 °C | HSDB | |
| 1.49 g/cm³ | at 25 °C | CAMEO |
Fenchlorphos solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Readily sol in most organic solvents: in acetone 908, chloroform 347, toluene 592, xylene 503, methanol 25, kerosene 37 (all in g/100 ml) | HSDB | |
| water solubility = 1 mg/l @ 20 °C | at 20 °C | HSDB | |
| IN WATER: 0.004 G/100 ML @ 25 °C; FREELY SOL IN CARBON TETRACHLORIDE, ETHER, METHYLENE CHLORIDE | at 25 °C | HSDB |
Fenchlorphos vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 0.0008 mmHg | at 25 °C | HSDB |
Fenchlorphos lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Noncombustible Solid | NIOSH |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Handling and storage
Fenchlorphos storage and handling
Fenchlorphos safe storage
Separated from strong oxidants and food and feedstuffs.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Fenchlorphos storage conditions
... MUST BE STORED IN ITS SEALED ORIGINAL CONTAINERS, IN WELL-AIRED, FRESH & DRYSTOREHOUSES OR IN SHADED & POSSIBLY WELL-AIRED PLACES. IT IS RECOMMENDED THAT THE PRODUCT'S TEMP ... NOT EXCEED 25-30 °C, & KEEP ... AWAY FROM SOURCES OF HEAT FREE FLAMES OR SPARK-GENERATING EQUIPMENT. CONTAINERS MUST BE STACKED IN SUCH A WAY AS TO PERMIT FREE CIRCULATION OF AIR ... AT BOTTOM & INSIDE OF PILES. STORAGE AREAS MUST BE LOCATED AT SUITABLE DISTANCE FROM INHABITED BUILDINGS, ANIMAL SHELTERS, & FOOD STORES; MOREOVER, THEY MUST BE INACCESSIBLE TO UNAUTHORIZED PERSONS, CHILDREN, & DOMESTIC ANIMALS. /PROTHOATE/
Source: Hazardous Substances Data Bank (HSDB)
Fenchlorphos incompatible materials
Strong oxidizers.
Source: Hazardous Substances Data Bank (HSDB)
Fenchlorphos reactivity
RONNEL is non-flammable and non-combustible. Decomposes with heating to evolve toxic and corrosive vapors (hydrogen chloride, phosphorus oxides, sulfur oxides). Incompatible with strong oxidizing agents.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Fenchlorphos in the storage compatibility matrix →
10 · Questions
Fenchlorphos — frequently asked questions
What is the CAS number of Fenchlorphos?
The CAS number of Fenchlorphos is 299-84-3. Its EC number is 206-082-6.
What is the chemical formula of Fenchlorphos?
The molecular formula of Fenchlorphos is C8H8Cl3O3PS and its molecular weight is 321.5 g/mol.
What does a Fenchlorphos label have to show?
Under CLP Annex VI the label for Fenchlorphos carries the pictograms Exclamation mark and Environment and the signal word is Warning.
Is Fenchlorphos flammable?
CLP Annex VI assigns Fenchlorphos 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.
Is Fenchlorphos a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Fenchlorphos. 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 Fenchlorphos?
The US occupational exposure limit reported for Fenchlorphos is 15.0 [mg/m3] (Haz-Map, Information on Hazardous Chemicals and Occupational Diseases). 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 Fenchlorphos?
The boiling point reported for Fenchlorphos is 97 °C (206.6 °F), at 0.0097508 mmHg (reduced pressure) (HSDB).
What is the melting point of Fenchlorphos?
The melting point reported for Fenchlorphos is 41 °C (105.8 °F) (HSDB).
How should Fenchlorphos be stored?
... MUST BE STORED IN ITS SEALED ORIGINAL CONTAINERS, IN WELL-AIRED, FRESH & DRYSTOREHOUSES OR IN SHADED & POSSIBLY WELL-AIRED PLACES. IT IS RECOMMENDED THAT THE PRODUCT'S TEMP ... NOT EXCEED 25-30 °C, & KEEP ... AWAY FROM SOURCES OF HEAT FREE FLAMES OR SPARK-GENERATING EQUIPMENT. CONTAINERS MUST BE STACKED IN SUCH A WAY AS TO PERMIT FREE CIRCULATION OF AIR ... AT BOTTOM & INSIDE OF PILES. STORAGE AREAS MUST BE LOCATED AT SUITABLE DISTANCE FROM INHABITED BUILDINGS, ANIMAL SHELTERS, & FOOD STORES; MOREOVER, THEY MUST BE INACCESSIBLE TO UNAUTHORIZED PERSONS, CHILDREN, & DOMESTIC ANIMALS. /PROTHOATE/ (Hazardous Substances Data Bank (HSDB))
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