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Impurities and reference standards

Pyridine

Also known as Azabenzene, Azine, Pyridin

CAS 110-86-1Formula C5H5NMolar mass 79.10 g/molEC 203-809-9
GHS signal word: Danger. Pictograms: Flammable, Harmful or irritant 206 suppliers listed
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Pyridine chemical structure, C5H5N, CAS 110-86-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless to yellow liquid
Melting point
-41.6 °C
Boiling point
115.2 to 115.3
Density
Relative density (water = 1): 0.98
Flash point
20 °C
HS code
293331
Category
Impurities and reference standards
UN number
UN 1282
Illustrative photo, 200 litre blue HDPE drums of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Pyridine?

Plain description, key identifiers and synonyms

Pyridine is an azaarene comprising a benzene core in which one -CH group is replaced by a nitrogen atom. It is the parent compound of the class pyridines. It has a role as an environmental contaminant. It is a member of pyridines, a mancude organic heteromonocyclic parent, a monocyclic heteroarene and an azaarene.

Pyridine is a heterocyclic aromatic organic compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
pyridine
CAS number
110-86-1 CAS number cross-checkedOther or deprecated CAS: 25013-01-8
EC number
203-809-9
Molecular formula
C5H5N
UNII
NH9L3PP67S
MDL number
MFCD00011732
InChIKey
JUJWROOIHBZHMG-UHFFFAOYSA-N
InChI
InChI=1S/C5H5N/c1-2-4-6-5-3-1/h1-5H
SMILES (canonical and isomeric)
C1=CC=NC=C1

Synonyms

  • Azabenzene
  • Azine
  • Pyridin
  • Piridina
  • Pirydyna
  • RCRA waste number U196
  • CP 32
  • pyridine ion (1-), hydrogen
  • pyridine-ring
  • pyridine-
  • Pyridine, super dry
  • Pyridine [UN1282] [Flammable liquid]
  • Pyridine- d5
  • Pyridine, ACS reagent, >=99.0%
  • Pyridine, ReagentPlus(R), >=99%
  • Ceftazidime EP Impurity F
  • RCRA waste no. U196
  • hydropyridine
  • Azinine
  • N-pyridine
  • pyridine fraction
  • [pyridine]
  • 2-pyridine
  • 4-pyridine
  • Pyridine II
Show all 35 synonyms
  • Pyridine III
  • Azabenzene, Azine
  • Pyridine 1 Degree
  • Pyridine, anhydrous
  • Pyridine, 99%
  • Pyridine, ACS grade
  • Pyridine, ACS reagent
  • Pyridine >99.0%
  • Pyridine, >=99%
  • Pyridine, acs

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless to yellow liquidexp.
Odour
Sharp, nauseatingexp.
Taste
AMINE TASTEexp.
Melting point
-41.6 °Cexp.
Boiling point
115.2 to 115.3exp.
Density
Relative density (water = 1): 0.98exp.
Flash point
20 °Cexp.
Autoignition temperature
482 °Cexp.
Solubility
Miscible with water @ 20 °Cexp.
Vapour pressure
20.8 mm Hg @ 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
79.10 g/molcalc.
Exact mass
79.0422 Dacalc.
LogP (octanol/water)
1.08calc.
Topological polar surface area
12.89 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
6calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccncc1

c1ccncc1

1 ring, 6 atoms. This chemical is the scaffold itself.

118,162 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant
330NFPA 704 rating

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H332Harmful if inhaled.
Precautionary statements (22)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1282
Transport hazard class
3
Packing group
II

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Pyridine suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 206 suppliers
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Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

206 suppliers in 26 countries

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Pyridine price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Solvent for anhydrous mineral salts, in org synthesis and anal chem.

Manufacture of vitamins (esp nicotinic acid), sulfa drugs, disinfectants, dyestuff, explosives, used in rubber indust.

Chemical intermediate for diquat & paraquat, piperidine, water proofing agents used in textiles, solvent in drug manufacture, chemical intermediate for antihistamines (incl chloropheniramine maleate), reagent (incl as scavenger for acids), intermediate for anti-infectives (incl cetylpyridinium chloride).

Industrial uses: Solvent, Intermediate, Dye.

Consumer uses: Solvent, Intermediate.

Use classes: Benzidines/Aromatic amines.

Roles

  • environmental contaminant

Functional uses

  • Catalyst
  • Dye
  • Flavouring and nutrient
  • Fragrance

How it is made

Reaction of acetaldehyde, ammonia, and formaldehyde in the presence of a catalyst such as an oxide or a phosphate of a tri or tetravalent metal at 250-500 °c and atmospheric pressure, natural pyridine is derived in isolated form from coking operations.

By extraction from lower-boiling fractions of tar distillates after removal of tar acids by sulfuric acid & purification by distillation with lime...

Most commercial pyridine is obtained by distillation from crude coal tar... Increased demand for high-purity pyridine has led to ... Synthesizing it from acetylene, formaldehyde, hemimethylal & ammonia.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 613-002-00-7

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Pyridine is traded under.

HS 2933.31Exact HS code

Pyridine and its salts

World exports in 2024
$105M
+9.3% vs 2023, imports $115M
2019 to 2024
Top exporters
  1. India * partner reported59.6%
  2. China14.5%
  3. Japan5.4%
Top importers
  1. United Kingdom28.0%
  2. United States14.5%
  3. China12.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Pyridine is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Pyridine, based on the data on this page

What is Pyridine?

Pyridine is an azaarene comprising a benzene core in which one -CH group is replaced by a nitrogen atom. It is the parent compound of the class pyridines. It has a role as an environmental contaminant. It is a member of pyridines, a mancude organic heteromonocyclic parent, a monocyclic heteroarene and an azaarene.

What is the CAS number of Pyridine?

The CAS registry number of Pyridine is 110-86-1. Other or deprecated CAS numbers: 25013-01-8.

What is the molecular formula and weight of Pyridine?

The molecular formula of Pyridine is C5H5N and its molar mass is 79.10 g/mol.

What is Pyridine used for?

Solvent for anhydrous mineral salts, in org synthesis and anal chem. Manufacture of vitamins (esp nicotinic acid), sulfa drugs, disinfectants, dyestuff, explosives, used in rubber indust.

Is Pyridine hazardous?

Pyridine carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, harmful if swallowed, harmful in contact with skin. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Pyridine?

Pyridine is usually classified under HS code 293331 (Pyridine and its salts). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyridine?

CompoundList lists 206 suppliers of Pyridine in China, United States, India, United Kingdom and 22 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Pyridine in India?

30 suppliers in India list Pyridine on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Pyridine?

Suppliers quote Pyridine on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Pyridine

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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