Product Identification
【Product Name】4,4'-Dipyridyl
【Synonyms】4,4'-Dipyridine 4,4-联吡啶
【CAS】553-26-4
【Formula】C10H8N2
【Molecular Weight】156.19
【EINECS】209-036-3
【RTECS】DW1760000
【RTECS Class】Other
【Merck】13,3383
【Beilstein/Gmelin】113176
【Beilstein Reference】5-23-08-00028
【EC Class】toxic

Physical and Chemical Properties
【Appearance】Off-white solid.
【Solubility in water】Slightly soluble
【Melting Point】78℃
【Boiling Point】305℃
【Vapor Pressure】0.0015 (25℃)
【pKa/pKb】10.73 (pKb)
【Partition Coefficient】1.2
【Heat Of Vaporization】52.3 kJ/mol
【Usage】Intermediate product.

First Aid Measures
【Ingestion】If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
【Inhalation】Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
【Skin】Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
【Eyes】Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Handling and Storage
【Storage】Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
【Handling】Wash thoroughly after handling. Use only in a well ventilated area. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.

Hazards Identification
【Ingestion】Harmful if swallowed. Causes gastrointestinal irritation with nausea, vomiting and diarrhea.
【Inhalation】Inhalation of dust may cause respiratory tract irritation.
【Skin】May cause skin irritation.
【Eyes】May cause eye irritation.
【Hazards】Contact with metals may evolve flammable hydrogen gas.
【EC Risk Phrase】R 20/21 25 36/37/38
【EC Safety Phrase】S 22 26 36/37/39 45
【UN (DOT)】2811

Exposure Controls/Personal Protection
【Personal Protection】Eyes: Wear appropriate protective eyeglasses or chemical safety ggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
【Respirators】Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
【Poison Class】3

Fire Fighting Measures
【Flash Point】104℃
【Fire Fighting】Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
【Fire Potential】Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Accidental Release Measures
【Small spills/leaks】Vacuum or sweep up material and place into a suitable disposal container. Avoid generating dusty conditions.

Stability and Reactivity
【Disposal Code】3
【Stability】Stable under normal temperatures and pressures.
【Incompatibilities】Strong oxidizing agents, strong acids.
【Decomposition】Nitrogen oxides, carbon monoxide, carbon dioxide.
【Combustion Products】Fire may produce irritating, corrosive and/or toxic gases.

Transport Information
【UN Number】2811
【Hazard Class】6.1
【Packing Group】I; II; III
【HS Code】2933 39 99