Molecular Formula: C₁₀H₁₀O₂
Molar mass: 162.1852 g/mol
Density: 1.166 g/cm³
Flash Point: 145.8 °C
Index of Refraction: 1.564
Melting point: 107-109 °C(lit.)
Boiling Point: 303.6 °C at 760 mmHg
Vapour Pressure: 0.00092 mmHg at 25°C
Appearance: white to light yellow crystal powder
Structure of 5-Methoxy-1-indanone (5111-70-6):
                          
Synonyms: 5-methoxyindan-1-one ; 1-Indanone, 5-methoxy- ; 1H-inden-1-one, 2,3-dihydro-5-methoxy- ; 5-Methoxy-2,3-dihydro-1H-inden-1-on ; 5-Methoxy-2,3-dihydro-1H-inden-1-one ; 1-Indanone, 5-methoxy-
Product Categories: Indane/Indanone and Derivatives ;Ketones ;Carbonyl Compounds

Carcinogenicity of 5-Methoxy-1-indanone (5111-70-6) hasn't been listed as a carcinogen by  NTP, IARC,ACGIH, or CA Prop 65.And its toxicological properties have not been fully investigated.

Hazard Note: Irritant
Hazard Codes: Xi,Xn
Risk Statements:
20:  Harmful by inhalation
21:  Harmful in contact with skin
22:  Harmful if swallowed 
36:  Irritating to the eyes
37:  Irritating to the respiratory system
38:  Irritating to the skin
Safety Statements:
24:  Avoid contact with skin
25:  Avoid contact with eyes
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36:  Wear suitable protective clothing 
37:  Wear suitable gloves

5-Methoxy-1-indanone (5111-70-6) is hazardous,so the first aid measures and others should be known .Such as:
Skin: Get medical aid. Should flush skin with plenty of water immediatelyfor 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.Then get medical aid soon. 
Inhalation: 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.
Ingestion: Wash mouth out with water,and get medical aid immediately.
Polymerization of the 5-Methoxy-1-indanone (5111-70-6) can be stable under normal temperature and pressure conditions.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: Carbon dioxide,carbon monoxide.