Chemical Safety Data Sheet MSDS / SDS
Pyrrole
Revision Date:2026-03-21Revision Number:1
Product identifier
- Product name: Pyrrole
- CBnumber: CB3852794
- CAS: 109-97-7
- EINECS Number: 203-724-7
- Synonyms: 1H-PYRROLE;Pyrroline
Relevant identified uses of the substance or mixture and uses advised against
- Relevant identified uses: For R&D use only. Not for medicinal, household or other use.
- Uses advised against: none
Company Identification
- Company: Chemicalbook
- Address: Building 1, Huihuang International, Shangdi 10th Street, Haidian District, Beijing
- Telephone: 010-86108875
GHS Label elements, including precautionary statements
-
Symbol(GHS)
- Signal wordDanger
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P233 Keep container tightly closed.
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
Hazard statements
H332 Harmful if inhaled
H318 Causes serious eye damage
H301 Toxic if swalloed
H226 Flammable liquid and vapour
Substance
- Product name: Pyrrole
- Synonyms: 1H-PYRROLE;Pyrroline
- CAS: 109-97-7
- EC number: 203-724-7
- MF: C4H5N
- MW: 67.09
General advice
Show this safety data sheet to the doctor in attendance.
If inhaled
After inhalation: fresh air. If breathing stops: mouthto-mouth breathing or artificial respiration. Oxygen if necessary. Immediately call in physician.
In case of skin contact
In case of skin contact: Take off immediately all contaminated clothing. Rinse skin with water/ shower.
In case of eye contact
After eye contact: rinse out with plenty of water. Immediately call in ophthalmologist. Remove contact lenses.
If swallowed
If swallowed: give water to drink (two glasses at most). Seek medical advice immediately. In exceptional cases only, if medical care is not available within one hour, induce vomiting (only in persons who are wide awake and fully conscious), administer activated charcoal (20 - 40 g in a 10% slurry) and consult a doctor as quickly as possible.
Most important symptoms and effects, both acute and delayed
The most important known symptoms and effects are described in the labelling (see section 2) and/or in section 11
Protection of first-aiders
For personal protection see section 8.
Notes to physician
No data available
Suitable extinguishing media
Carbon dioxide (CO2) Foam Dry powder
Unsuitable extinguishing media
For this substance/mixture no limitations of extinguishing agents are given.
Specific hazards during fire fighting
Combustible. Vapours are heavier than air and may spread along floors. Forms explosive mixtures with air at elevated temperatures. Development of hazardous combustion gases or vapours possible in the event of fire.
Hazardous combustion products
Carbon oxides Nitrogen oxides (NOx)
Specific extinguishing methods
Remove container from danger zone and cool with water. Suppress (knock down) gases/vapours/mists with a water spray jet. Prevent fire extinguishing water from contaminating surface water or the ground water system.
Special protective equipment for fire-fighters
Stay in danger area only with self-contained breathing apparatus. Prevent skin contact by keeping a safe distance or by wearing suitable protective clothing.
NFPA 704
2
0
| HEALTH | |||
| FIRE | 2 | Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur and multiple finely divided suspended solids that do not require heating before ignition can occur. Flash point between 37.8 and 93.3 °C (100 and 200 °F). (e.g. diesel fuel, sulfur) | |
| REACT | 0 | Normally stable, even under fire exposure conditions, and is not reactive with water (e.g. helium,N2) | |
| SPEC. HAZ. |
Personal precautions, protective equipment and emergency procedures
Advice for non-emergency personnel: Do not breathe vapours, aerosols. Avoid substance contact. Ensure adequate ventilation. Keep away from heat and sources of ignition. Evacuate the danger area, observe emergency procedures, consult an expert. Advice for emergency responders: For personal protection see section 8.
Environmental precautions
Do not let product enter drains. Risk of explosion.
Methods and materials for containment and cleaning up
Cover drains. Collect, bind, and pump off spills. Observe possible material restrictions (see sections 7 and 10). Take up carefully with liquid-absorbent material . Dispose of properly. Clean up affected area.
Handling
Advice on protection against fire and explosionKeep away from open flames, hot surfaces and sources of ignition. Take precautionary measures against static discharge.
Advice on safe handling
Work under hood. Do not inhale substance/mixture. Avoid generation of vapours/aerosols.
Storage
Further information on storage conditionsKeep container tightly closed in a dry and wellventilated place. Keep away from heat and sources of ignition. Keep locked up or in an area accessible only to qualified or authorised persons.
Storage class
3, Flammable liquids
Recommended storage temperature
2 - 8 °C
Further information on storage stability
Store under inert gas. Air, light, and moisture sensitive.
Packaging material
Suitable material: Mild Steel Drum, Amber Glass Ampules
Ingredients with workplace control parameters
Contains no substances with occupational exposure limit values.
Engineering measures
No data available
Personal protective equipment
Respiratory protectionrequired when vapours/aerosols are generated.
Our recommendations on filtering respiratory protection are based on the following standards: DIN EN 143, DIN 14387 and other accompanying standards relating to the used respiratory protection system.
Recommended Filter type
Our recommendations on filtering respiratory protection are based on the following standards: DIN EN 143, DIN 14387 and other accompanying standards relating to the used respiratory protection system.
Filter type ABEK
The entrepeneur has to ensure that maintenance, cleaning and testing of respiratory protective devices are carried out according to the instructions of the producer. These measures have to be properly documented.
Eye/face protection
The entrepeneur has to ensure that maintenance, cleaning and testing of respiratory protective devices are carried out according to the instructions of the producer. These measures have to be properly documented.
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Tightly fitting safety goggles
Skin and body protection
Tightly fitting safety goggles
Flame retardant antistatic protective clothing.
Hand protection
Material
butyl-rubber
Break through time
480 min
Glove thickness
0.7 mm
Protective index
Full contact
Manufacturer
Butoject® (KCL 898)
Material
Chloroprene
Break through time
30 min
Glove thickness
0.65 mm
Protective index
Splash contact
Manufacturer
KCL 720 Camapren®
Remarks
This recommendation applies only to the product stated in the safety data sheet, supplied by us and for the designated use. When dissolving in or mixing with other substances and under conditions deviating from those stated in EN 16523-1 please contact the supplier of CE-approved gloves (e.g. KCL GmbH, D- 36124 Eichenzell, Internet: www.kcl.de).
Hygiene measures
Change contaminated clothing. Preventive skin protection recommended. Wash hands after working with substance.
Information on basic physicochemical properties
- Solubility60g/l
- Physical stateLiquid
- Dielectric constant7.5（17℃）
- Partition coefficient: n-octanol/waterNo data available
- Water solubility60 g/l (20 °C)
- Density0.967 g/cm3 (25 °C)
Method: lit. - Relative density0.967 g/mL at 25 °C (lit.)
- Relative vapor density2.32
- Vapor pressure8.7 hPa (20 °C)
- Lower explosion limit / Lower flammability limit3.10 %(V)
- Upper explosion limit / Upper flammability limit14.8 %(V)
- Self-ignition550 °C
- Burning rateNo data available
- Flammability (liquids)No data available
- Flammability (solid, gas)No data available
- Evaporation rateNo data available
- Flash point36 °C
Method: closed cup - Boiling point/boiling range131 °C
Method: lit. - Melting point/ range-23 °C
Method: lit. - pH> 6 (20 °C)
Concentration (as aqueous solution): 10 g/l - Odor ThresholdNo data available
- Odorat 0.10 % in propylene glycol. sweet warm nutty ethereal
- Colordark brown
- Appearanceliquid
- Particle characteristics Particle sizeNo data available
- Molecular weight67.09 g/mol
- Oxidizing propertiesnone
- Explosive propertiesNo data available
- Flow timeNo data available
- Viscosity, kinematicNo data available
- Viscosity, dynamicNo data available
- Decomposition temperatureNo data available
- Autoignition temperature550 °C
Reactivity
Vapour/air-mixtures are explosive at intense warming.
Chemical stability
The product is chemically stable under standard ambient conditions (room temperature) .
Possibility of hazardous reactions
Risk of ignition or formation of inflammable gases or vapours with: Strong oxidizing agents Exothermic reaction with: acids
Conditions to avoid
Heating.
Incompatible materials
No data available
Hazardous decomposition products
In the event of fire: see section 5
11.1 Information on toxicological effects
Acute toxicityLD50 Oral - Rat - 137 mg/kg
Remarks: (External MSDS)
Acute toxicity estimate Inhalation - 4 h - 11 mg/l - vapour (Expert judgement)
Symptoms: Possible damages:, Irritation symptoms in the respiratory tract.
Dermal: No data available
Skin corrosion/irritation
Remarks: (External MSDS)
Acute toxicity estimate Inhalation - 4 h - 11 mg/l - vapour (Expert judgement)
Symptoms: Possible damages:, Irritation symptoms in the respiratory tract.
Dermal: No data available
Skin - Rabbit
Result: No skin irritation
Remarks: (External MSDS)
Serious eye damage/eye irritation
Result: No skin irritation
Remarks: (External MSDS)
Eyes - Rabbit
Result: Risk of serious damage to eyes.
Remarks: (External MSDS)
Respiratory or skin sensitization
Result: Risk of serious damage to eyes.
Remarks: (External MSDS)
Classified based on available data. For more details, see section 2
Germ cell mutagenicity
Classified based on available data. For more details, see section 2
Carcinogenicity
Classified based on available data. For more details, see section 2
Reproductive toxicity
Classified based on available data. For more details, see section 2
Specific target organ toxicity - single exposure
Classified based on available data. For more details, see section 2
Specific target organ toxicity - repeated exposure
Classified based on available data. For more details, see section 2
Aspiration hazard
Classified based on available data. For more details, see section 2
11.2 Additional Information
RTECS: UX9275000
To the best of our knowledge, the chemical, physical, and toxicological properties have not been thoroughly investigated.
After absorption:
CNS disorders
Damage to:
Liver
Under given conditions, contact with nitrites or nitric acid can lead to the formation of nitrosamines, which have shown themselves to be carcinogenic in animal exper- iments.
Other dangerous properties can not be excluded.
Handle in accordance with good industrial hygiene and safety practice.
Liver - Irregularities - Based on Human Evidence
To the best of our knowledge, the chemical, physical, and toxicological properties have not been thoroughly investigated.
After absorption:
CNS disorders
Damage to:
Liver
Under given conditions, contact with nitrites or nitric acid can lead to the formation of nitrosamines, which have shown themselves to be carcinogenic in animal exper- iments.
Other dangerous properties can not be excluded.
Handle in accordance with good industrial hygiene and safety practice.
Liver - Irregularities - Based on Human Evidence
Ecotoxicity
Components:
pyrrole:
Toxicity to fishLC50 (Leuciscus idus (Golden orfe)): 80 mg/l Exposure time: 96 h Remarks: (External MSDS)
Toxicity to microorganisms
EC50 (Photobacterium phosphoreum): 410 mg/l Exposure time: 30 min Test Type: microtox test Remarks: (External MSDS)
Ecotoxicology Assessment
Chronic aquatic toxicityThis product has no known ecotoxicological effects.
Persistence and degradability
No data available
Bioaccumulative potential
No data available
Mobility in soil
No data available
Other adverse effects
Components:
pyrrole:
Additional ecological informationDepending on the concentration, phosphorus and/or nitrogen compounds may contribute to the eutrophication of drinking- water supplies. Discharge into the environment must be avoided.
Disposal methods
Waste from residuesOffer surplus and non-recyclable solutions to a licensed disposal company.
International Regulations
IATA-DGR
UN/ID No. : UN 1992
Proper shipping name : Flammable liquid, toxic, n.o.s.
(pyrrole)
Class : 3
Subsidiary risk : 6.1
Packing group : III
Labels : Class 3 - Flammable liquids, Division 6.1 - Toxic substances
Packing instruction (cargo aircraft) : 366
Packing instruction (passenger aircraft) : 355
Proper shipping name : Flammable liquid, toxic, n.o.s.
(pyrrole)
Class : 3
Subsidiary risk : 6.1
Packing group : III
Labels : Class 3 - Flammable liquids, Division 6.1 - Toxic substances
Packing instruction (cargo aircraft) : 366
Packing instruction (passenger aircraft) : 355
IMDG-Code
UN number : UN 1992
Proper shipping name : FLAMMABLE LIQUID, TOXIC, N.O.S.
(pyrrole)
Class : 3
Subsidiary risk : 6.1
Packing group : III
Labels : 3 (6.1)
EmS Code : F-E, S-D
Marine pollutant : no
Proper shipping name : FLAMMABLE LIQUID, TOXIC, N.O.S.
(pyrrole)
Class : 3
Subsidiary risk : 6.1
Packing group : III
Labels : 3 (6.1)
EmS Code : F-E, S-D
Marine pollutant : no
Transport in bulk according to Annex II of MARPOL 73/78 and the IBC Code
Not applicable for product as supplied.
National Regulations
JT/T 617
UN number : UN 1992
Proper shipping name : FLAMMABLE LIQUID, TOXIC, N.O.S.
(pyrrole)
Class : 3
Subsidiary risk : 6.1
Packing group : III
Labels : 3 (6.1)
Environmentally hazardous : no
Proper shipping name : FLAMMABLE LIQUID, TOXIC, N.O.S.
(pyrrole)
Class : 3
Subsidiary risk : 6.1
Packing group : III
Labels : 3 (6.1)
Environmentally hazardous : no
Special precautions for user
The transport classification(s) provided herein are for informational purposes only, and solely based upon the properties of the unpackaged material as it is described within this Safety Data Sheet. Transportation classifications may vary by mode of transportation, package sizes, and variations in regional or country regulations.
National regulatory information
Regulations on Safety Management of Hazardous Chemicals
Catalogue of Hazardous Chemicals
Identification of Major Hazard Installations for Hazardous Chemicals (GB 18218)
No. / Code Chemical name / Category Threshold quantity
W5.4 Flammable liquids 5,000 t
Hazardous Chemicals for Priority Management
Not applicable under SAWS
Regulation of Environmental Management on the First Import of Chemicals and the Import and Export of Toxic Chemicals
China Severely Restricted Toxic Chemicals for Import and Export
Not applicable
Full text of other abbreviations
AIIC - Australian Inventory of Industrial Chemicals
ANTT - National Agency forTransport by Land of Brazil
ASTM - American Society for the Testing of Materials
bw - Body weight
CMR - Carcinogen, Mutagen or Reproductive Toxicant
DIN -Standard of the German Institute for Standardisation
DSL - Domestic SubstancesList (Canada)
ECx - Concentration associated with x% response
ELx - Loading rate associated with x% response
EmS - Emergency Schedule
ENCS - Existing and NewChemical Substances (Japan)
ErCx - Concentration associated with x% growth rate response
ERG - Emergency Response Guide
GHS - Globally Harmonised System
GLP - Good Laboratory Practice
IARC - International Agency for Research on Can- cer
IATA - International Air Transport Association
IBC - International Code for theConstruction and Equipment of Ships carrying Dangerous Chemicals in Bulk
IC50 -Half maximal inhibitory concentration
ICAO - International Civil Aviation Organiza- tion
IECSC - Inventory of Existing Chemical Substances in China
IMDG - Interna- tional Maritime Dangerous Goods
IMO - International Maritime Organisation
ISHL -Industrial Safety and Health Law (Japan)
ISO - International Organisation forStandardisation
KECI - Korea Existing Chemicals Inventory
LC50 - Lethal Concen- tration to 50 % of a test population
LD50 - Lethal Dose to 50% of a test population (Median Lethal Dose)
MARPOL - International Convention for the Prevention of Pol- lution from Ships
MERCOSUR - The Agreement for the Facilitation of the Transport of Dangerous Goods
n.o.s. - Not Otherwise Specified
Nch - Chilean Norm
NO(A)EC - No Observed (Adverse) Effect Concentration
NO(A)EL - No Observed (Adverse) Ef- fect Level
NOELR - No Observable Effect Loading Rate
NOM - Official MexicanNorm
NTP - National Toxicology Program
NZIoC - New Zealand Inventory of Chem- icals
OECD - Organisation for Economic Co-operation and Development
OPPTS - Of- fice of Chemical Safety and Pollution Prevention
PBT - Persistent, Bioaccumulative and Toxic substance
PICCS - Philippines Inventory of Chemicals and Chemical Sub- stances
(Q)SAR - (Quantitative) Structure Activity Relationship
REACH - Regulation (EC) No 1907/2006 of the European Parliament and of the Council concerning theRegistration, Evaluation, Authorisation and Restriction of Chemicals
SADT - Self-Accelerating Decomposition Temperature
SDS - Safety Data Sheet
TCSI - TaiwanChemical Substance Inventory
TDG - Transportation of Dangerous Goods
TECI -Thailand Existing Chemicals Inventory
TSCA - Toxic Substances Control Act (UnitedStates)
UN - United Nations
UNRTDG - United Nations Recommendations on theTransport of Dangerous Goods
vPvB - Very Persistent and Very Bioaccumulative
WHMIS - Workplace Hazardous Materials Information System
ANTT - National Agency forTransport by Land of Brazil
ASTM - American Society for the Testing of Materials
bw - Body weight
CMR - Carcinogen, Mutagen or Reproductive Toxicant
DIN -Standard of the German Institute for Standardisation
DSL - Domestic SubstancesList (Canada)
ECx - Concentration associated with x% response
ELx - Loading rate associated with x% response
EmS - Emergency Schedule
ENCS - Existing and NewChemical Substances (Japan)
ErCx - Concentration associated with x% growth rate response
ERG - Emergency Response Guide
GHS - Globally Harmonised System
GLP - Good Laboratory Practice
IARC - International Agency for Research on Can- cer
IATA - International Air Transport Association
IBC - International Code for theConstruction and Equipment of Ships carrying Dangerous Chemicals in Bulk
IC50 -Half maximal inhibitory concentration
ICAO - International Civil Aviation Organiza- tion
IECSC - Inventory of Existing Chemical Substances in China
IMDG - Interna- tional Maritime Dangerous Goods
IMO - International Maritime Organisation
ISHL -Industrial Safety and Health Law (Japan)
ISO - International Organisation forStandardisation
KECI - Korea Existing Chemicals Inventory
LC50 - Lethal Concen- tration to 50 % of a test population
LD50 - Lethal Dose to 50% of a test population (Median Lethal Dose)
MARPOL - International Convention for the Prevention of Pol- lution from Ships
MERCOSUR - The Agreement for the Facilitation of the Transport of Dangerous Goods
n.o.s. - Not Otherwise Specified
Nch - Chilean Norm
NO(A)EC - No Observed (Adverse) Effect Concentration
NO(A)EL - No Observed (Adverse) Ef- fect Level
NOELR - No Observable Effect Loading Rate
NOM - Official MexicanNorm
NTP - National Toxicology Program
NZIoC - New Zealand Inventory of Chem- icals
OECD - Organisation for Economic Co-operation and Development
OPPTS - Of- fice of Chemical Safety and Pollution Prevention
PBT - Persistent, Bioaccumulative and Toxic substance
PICCS - Philippines Inventory of Chemicals and Chemical Sub- stances
(Q)SAR - (Quantitative) Structure Activity Relationship
REACH - Regulation (EC) No 1907/2006 of the European Parliament and of the Council concerning theRegistration, Evaluation, Authorisation and Restriction of Chemicals
SADT - Self-Accelerating Decomposition Temperature
SDS - Safety Data Sheet
TCSI - TaiwanChemical Substance Inventory
TDG - Transportation of Dangerous Goods
TECI -Thailand Existing Chemicals Inventory
TSCA - Toxic Substances Control Act (UnitedStates)
UN - United Nations
UNRTDG - United Nations Recommendations on theTransport of Dangerous Goods
vPvB - Very Persistent and Very Bioaccumulative
WHMIS - Workplace Hazardous Materials Information System
Disclaimer:
The information in this MSDS is only applicable to the specified product, unless otherwise specified, it is not applicable to the mixture of this product and other substances. This MSDS only provides information on the safety of the product for those who have received the appropriate professional training for the user of the product. Users of this MSDS must make independent judgments on the applicability of this SDS. The authors of this MSDS will not be held responsible for any harm caused by the use of this MSDS.