Furan

C4H4O

furan

CAS110-00-9
GHS02 Gefahrensymbol: Entzündbar – Flamme
GHS08 Gefahrensymbol: Gesundheitsgefahr – Gesundheitsgefahr
GHS07 Gefahrensymbol: Gesundheitsschädlich/Reizend – Ausrufezeichen
Danger

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Identification

CAS Number
110-00-9
EC Number
203-727-3
UN Number
2389
Index Number
603-105-00-5
PubChem CID
8029

Physical-chemical properties

Molecular Formula
C4H4O
Molar Mass
68.07 g/mol
IUPAC Name
furan

Chemical Identifiers

InChI
InChI=1S/C4H4O/c1-2-4-5-3-1/h1-4H
InChI Key
YLQBMQCUIZJEEH-UHFFFAOYSA-N

Overview

Furan (CAS 110-00-9) is a heterocyclic organic compound with high flammability and significant health hazards including carcinogenic properties. Furan represents a fundamental five-membered aromatic ring structure containing one oxygen atom, making it an essential building block in organic chemistry and industrial applications. This colorless, volatile liquid exhibits exceptional reactivity due to its unsaturated heterocyclic nature, which contributes both to its synthetic utility and its considerable safety concerns. The compound's molecular structure, with the formula C4H4O and molecular weight of 68.07 g/mol, places it among the simplest oxygen-containing aromatic systems. The safety profile of furan demands careful attention, as it carries multiple serious hazard classifications. As a Category 1 flammable liquid under GHS classification, it poses extreme fire risks with a very low flash point. More critically, furan is classified as a Category 1B carcinogen and Category 2 mutagen, requiring stringent handling protocols and exposure controls. The compound also presents acute toxicity risks and can cause skin irritation, necessitating comprehensive personal protective equipment during handling. Industrial applications of furan primarily center around its role as a chemical intermediate in pharmaceutical synthesis, polymer production, and fine chemical manufacturing. The compound serves as a precursor for furan resins and finds application in the production of tetrahydrofuran, a widely used solvent. Like ethylbenzene and styrene, furan plays a crucial role in polymer chemistry, though its applications are more specialized due to safety considerations. OYSI maintains availability of furan for qualified industrial customers, ensuring proper documentation and compliance with all relevant safety and transportation regulations.

Safety & Classification

Danger
Classification:

Flam. Liq. 1; Carc. 1B; Muta. 2; Acute Tox. 4 *; Acute Tox. 4 *; STOT RE 2 *; Skin Irrit. 2; Aqua...

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H224

Extremely flammable liquid and vapour.

H350

May cause cancer.

H341

Suspected of causing genetic defects.

H332

Harmful if inhaled.

H302

Harmful if swallowed.

H373

May cause damage to organs through prolonged or repeated exposure.

H315

Causes skin irritation.

H412

Harmful to aquatic life with long lasting effects.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Inhalation

Harmful

Measures if vapours or dust are inhaled

First Aid Actions

  • +P304IF INHALED:
  • +P340Remove person to fresh air and keep comfortable for breathing.
  • +P311Call a POISON CENTER/doctor.

Related hazard statements:

Skin Contact

Irritant

Measures if substance contacts the skin

First Aid Actions

  • +P302IF ON SKIN:
  • +P352Wash with plenty of water.
  • +P361Take off immediately all contaminated clothing.
  • +P313Get medical advice/attention.

Related hazard statements:

Ingestion

Harmful

Measures if substance is accidentally swallowed

First Aid Actions

  • +P301IF SWALLOWED:
  • +P330Rinse mouth.
  • +P331Do NOT induce vomiting.
  • +P310Immediately call a POISON CENTER/doctor.

Related hazard statements:

General Measures

Emergency 112 | Poison Control: +49 30 19240 (DE), +33 1 45 42 59 59 (FR), +31 30 274 88 88 (NL)

First aid measures are based on CLP classification and associated P-statements. They do not replace the Safety Data Sheet (SDS). In case of emergency, always consult the full SDS and a physician.

Transport (ADR)

UN Number2389
ADR Class3
Packing GroupI
Tunnel CodeD/E
Proper Shipping NameFuran
Marine PollutantNo

Frequently Asked Questions

What is furan?

Furan is a heterocyclic organic compound with the molecular formula C4H4O and molecular weight 68.07 g/mol. It is characterized by a five-membered aromatic ring containing four carbon atoms and one oxygen atom. This colorless liquid compound is highly flammable and volatile, belonging to the class of oxygen-containing heterocycles. Furan is classified as extremely hazardous due to its carcinogenic, mutagenic, and toxic properties.

What are the physicochemical properties of furan?

Furan is a colorless, volatile liquid with a characteristic ethereal odor at room temperature. It has a low boiling point of approximately 31.4°C and is highly flammable with extremely low flash point. The compound is moderately soluble in water and miscible with most organic solvents including alcohols, ethers, and hydrocarbons. Its aromatic nature makes it chemically reactive, particularly susceptible to oxidation and polymerization reactions.

What is furan used for?

Furan serves as an important intermediate in organic synthesis and pharmaceutical manufacturing. It is primarily used in the production of tetrahydrofuran (THF), which is a valuable solvent and polymer precursor. Furan derivatives are utilized in the synthesis of various fine chemicals, pharmaceuticals, and agrochemicals. Additionally, it finds applications in the manufacture of resins, lacquers, and as a chemical building block for specialty organic compounds in research and industrial processes.

How to handle furan safely?

Furan requires extreme caution during handling due to its high flammability and toxicity. Use appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and respiratory protection in well-ventilated areas or fume hoods. Eliminate all ignition sources and use explosion-proof equipment. Handle only in small quantities and avoid skin contact or inhalation. Emergency shower and eyewash facilities must be readily accessible. Ground all equipment to prevent static discharge.

How to store furan correctly?

Furan must be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat sources, sparks, and open flames. Use explosion-proof electrical equipment and maintain storage temperature below 25°C. Keep away from oxidizing agents, acids, and bases. Store in original containers with proper labeling and ensure fire suppression systems are available. Limit inventory quantities and implement strict access controls due to its carcinogenic classification.

What to do in case of contact with furan?

Immediate action is required upon furan contact. For skin contact, remove contaminated clothing and rinse affected area with plenty of water for at least 15 minutes. If inhaled, move victim to fresh air immediately and seek medical attention. For eye contact, flush thoroughly with water and remove contact lenses if present. In case of ingestion, do not induce vomiting and seek immediate medical care. Always consult medical professionals promptly due to furan's toxic properties.

How to dispose of furan appropriately?

Furan disposal must comply with local and national hazardous waste regulations due to its classification as carcinogenic and toxic waste. Contact authorized hazardous waste disposal companies for proper collection and treatment. Do not pour down drains or dispose of in regular waste streams. Small quantities can be destroyed by controlled incineration at licensed facilities with appropriate emission controls. Maintain detailed disposal records and follow all applicable environmental regulations.

How to transport furan?

Furan is classified under ADR Class 3 (flammable liquids), Packing Group I, indicating extremely high danger during transport. It requires specialized hazardous goods packaging, labeling with appropriate UN numbers, and transport by certified dangerous goods carriers. Vehicles must have proper ventilation, fire extinguishing equipment, and emergency response information. Drivers need hazardous materials certification and shipping documentation must include safety data sheets and emergency contact information.

Is furan subject to specific regulations?

Furan is subject to extensive regulatory oversight under multiple frameworks. It is classified as a Category 1B carcinogen and Category 2 mutagen under CLP regulation, requiring strict labeling and safety measures. REACH registration applies for commercial use in Europe. The substance faces restrictions in consumer products and food contact materials. Workplace exposure limits are strictly regulated, and environmental discharge permits may be required due to its toxicity profile.

Where to buy furan in Europe?

Furan is available through specialized chemical distributors in Europe, including OYSI, which supplies high-quality chemical products to industrial customers. Due to its hazardous classification, purchase requires proper licensing, safety documentation, and compliance with regulatory requirements. Buyers must demonstrate legitimate industrial use and appropriate handling capabilities. Contact OYSI's technical team for availability, specifications, and regulatory guidance for furan procurement in European markets.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.