Empirical Formula: C₁₃H₉N
Molecular Weight: 179.2173
Nominal Mass: 179 Da
Average Mass: 179.2173 Da
Monoisotopic Mass: 179.073499 Da 
Index of Refraction: 1.616
Molar Refractivity: 56.02 cm³
Molar Volume: 160.3 cm³
Surface Tension: 49.4 dyne/cm
Density: 1.11 g/cm³
Flash Point: 155.5 °C
Enthalpy of Vaporization: 57.51 kJ/mol
Boiling Point: 332.3 °C at 760 mmHg 
Vapour Pressure: 0.000147 mmHg at 25 °C
Melting point: 85-87 °C(lit.)
Water solubility: Limited soluble
Sensitive: Moisture sensitive
Appearance: Beige crystalline powder
Structure of 4-Cyanobiphenyl (CAS NO.2920-38-9):
                    
Product Category of 4-Cyanobiphenyl (CAS NO.2920-38-9): Biphenyl derivatives;Building Blocks for Liquid Crystals;Functional Materials

 4-Cyanobiphenyl (CAS NO.2920-38-9) has been used for intermediate of liquid crystals.

The Hazard Codes:  Xn,Xi
The Risk Statements:
20/21/22:  Harmful by inhalation, in contact with skin and if swallowed 
36/37/38:  Irritating to eyes, respiratory system and skin 
The Safety Statements:
22:  Do not breathe dust 
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
36/37:  Wear suitable protective clothing and gloves 
36/37/39:  Wear suitable protective clothing, gloves and eye/face protect
RIDADR: UN 3439 6.1/PG 3
WGK Germany: 3
Hazard Note: Irritant
HazardClass: 6.1
PackingGroup: III

 4-Cyanobiphenyl , its cas register number is 2920-38-9. It also can be called p-Cyanobiphenyl ; and p-Phenylbenzonitrile . It is hazardous, so the first aid measures and others should be known. Such as: When on the skin: first, should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly, get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While, it's inhaled: Remove from exposure and move to fresh air immediately. Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product: Wash mouth out with water, and get medical aid immediately.
In addition, 4-Cyanobiphenyl (CAS NO.2920-38-9) is not compatible with strong oxidizing agents, strong bases, and you must not take it with incompatible materials. And also prevent it to broken down into hazardous decomposition products: Hydrogen cyanide, nitrogen oxides, carbon monoxide, carbon dioxide.