Melting point :171-173 °C (lit.)
Boiling point :251.97°C (rough estimate)
Density :1.2620 (rough estimate)
refractive index :1.6910 (estimate)
Flash point :>250°C
storage temp. :2-8°C
solubility :125g/l
pka :pKa 2.00/3.60/10.8(H2O) (Uncertain)
form :Crystals or Crystalline Powder
color :White or colorless
Odor :Odorless
PH Range :5.5 - 6.5 at 10 g/l at 25 °C
PH :6-8 (50g/l, H2O, 20℃)
Water Solubility :14 g/100 mL (25 ºC)
Sensitive :Air Sensitive
Merck :14,5186
BRN :119374
BCS Class :1,3
Stability :Stability Stable, but may be air or light sensitive. Combustible. Incompatible with strong oxidizing agents, chloral, aldehydes, iodine, ferric salts, hypochlorites.
InChIKey :QRXWMOHMRWLFEY-UHFFFAOYSA-N
CAS DataBase Reference :54-85-3(CAS DataBase Reference)
IARC :3 (Vol. 4, Sup 7) 1987
NIST Chemistry Reference :Isoniazid(54-85-3)
EPA Substance Registry System :Isoniazid (54-85-3)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
Precautionary statements:	P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P270 Do not eat, drink or smoke when using this product. P280 Wear protective gloves/protective clothing/eye protection/face protection. P301+P312 IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352 IF ON SKIN: wash with plenty of soap and water. P332+P313 IF SKIN irritation occurs: Get medical advice/attention.