Empirical Formula: C₁₄H₁₂Cl₂
Molecular Weight: 251.1511
Nominal Mass: 250 Da
Average Mass: 251.1511 Da
Monoisotopic Mass: 250.031606 Da 
Index of Refraction: 1.584
Molar Refractivity: 70.37 cm³
Molar Volume: 210.1 cm³
Surface Tension: 40.8 dyne/cm
Density: 1.195 g/cm³
Flash Point: 196.3 °C
Melting point: 126 °C (dec.)(lit.)
Enthalpy of Vaporization: 60.35 kJ/mol
Boiling Point: 380 °C at 760 mmHg
Vapour Pressure: 1.23E-05 mmHg at 25 °C
Structure of 4,4'-Bis(chloromethyl)-1,1'-biphenyl (CAS NO.1667-10-3):
                       
IUPAC Name: 1-(Chloromethyl)-4-[4-(chloromethyl)phenyl]benzene
Canonical SMILES: C1=CC(=CC=C1CCl)C2=CC=C(C=C2)CCl
InChI: InChI=1S/C14H12Cl2/c15-9-11-1-5-13(6-2-11)14-7-3-12(10-16)4-8-14/h1-8H,9-10H2
InChIKey: INZDTEICWPZYJM-UHFFFAOYSA-N
Product Category of 4,4'-Bis(chloromethyl)-1,1'-biphenyl (CAS NO.1667-10-3): Intermediates of Dyes and Pigments;Biphenyl & Diphenyl ether;Biphenyls (for High-Performance Polymer Research);Functional Materials;Aryl;Halogenated Hydrocarbons

4,4'-Bis(chloromethyl)-1,1'-biphenyl (CAS NO.1667-10-3) can be used as raw material of the synthesis of high-grade optical brighteners and electronic chemicals.

Hazard Codes: C
Risk Statements: 34
R34:Causes burns.
Safety Statements: 26-27-36/37/39-45
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S27:Take off immediately all contaminated clothing. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: UN 3261 8/PG 2
WGK Germany: 3

 4,4'-Bis(chloromethyl)-1,1'-biphenyl , its cas register number is 1667-10-3. It also can be called 4,4'-Bis(chloromethyl)biphenyl ; and 1,1'-Biphenyl, 4,4'-bis(chloromethyl)- .