Empirical Formula: C₅H₄Cl₂N₂
Molecular Weight: 163.0047 g/mol
EINECS: 242-794-3 
Index of Refraction: 1.551
Density: 1.404 g/cm³
Flash Point: 159.1 °C
Enthalpy of Vaporization: 48.98 kJ/mol
Boiling Point: 272.1 °C at 760 mmHg
Vapour Pressure: 0.0104 mmHg at 25 °C
Melting point: 84-89 °C(lit.)
Appearance: Brown crystalline powder
Structure of 3,6-Dichloro-4-methylpyridazine (CAS NO.19064-64-3):
                      
IUPAC Name: 3,6-Dichloro-4-methylpyridazine
Product Category of 3,6-Dichloro-4-methylpyridazine (CAS NO.19064-64-3): Halides;Pyrazines, Pyrimidines & Pyridazines;Heterocyclic Building Blocks

 3,6-Dichloro-4-methylpyridazine (CAS NO.19064-64-3) hasn't been listed as a carcinogen by NTP, IARC, ACGIH, or CA Prop 65. And the toxicological properties have not been fully investigated.

Hazard Codes: Xi,Xn
Risk Statements: 36/37/38-20/21/22 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-37/39-36/37/39-22 
S22:Do not breathe dust. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S37/39:Wear suitable gloves and eye/face protection.

 3,6-Dichloro-4-methylpyridazine , its cas register number is 19064-64-3. It also can be called 3,6-Dichloro-5-methylpyridazine ; and Pyridazine, 3,6-dichloro-4-methyl- . 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. Notes to physician: Treat supportively and symptomatically.
In addition, 3,6-Dichloro-4-methylpyridazine (CAS NO.19064-64-3) could be stable under normal temperatures and pressures. It is not compatible with strong oxidizing agents, and you must not take it with incompatible materials. And also prevent it to broken down into hazardous decomposition products: nitrogen oxides, hydrogen chloride, carbon monoxide, carbon dioxide.