Melting point :188 C
Boiling point :687℃
alpha :D20 +201° (c = 1 in water)
refractive index :205 ° (C=1, H2O)
Flash point :>110°(230°F)
storage temp. :Inert atmosphere,2-8°C
solubility :Freely soluble in water, soluble in methanol, practically insoluble in methylene chloride.
form :Solid
color :White to Almost white
PH :pH (30g/l, 25℃) : 4.5～7.5
Water Solubility :Freely soluble in water
Merck :14,6904
BRN :4287093
CAS DataBase Reference :7240-38-2(CAS DataBase Reference)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled Sensitisation, respiratory Category 1 Danger P261, P285, P304+P341, P342+P311,P501 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 Wear respiratory protection. P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P342+P311 IF experiencing respiratory symptoms: call a POISON CENTER or doctor/physician. P405 Store locked up.