Melting point :16-18 °C (lit.)
Boiling point :102 °C/200 mmHg (lit.)
Density :1.138 g/mL at 25 °C (lit.)
refractive index :n20/D 1.431(lit.)
Flash point :138 °F
storage temp. :2-8°C
solubility :Chloroform (Soluble), Methanol (Soluble)
form :Liquid After Melting
pka :1.84(at 25℃)
color :Clear colorless to light brown
Specific Gravity :1.138
Water Solubility :miscible
Merck :14,7821
BRN :878176
Stability :Stable. Incompatible with bases, oxidizing agents, reducing agents. Combustible.
CAS DataBase Reference :471-25-0(CAS DataBase Reference)
NIST Chemistry Reference :Propiolic acid(471-25-0)
EPA Substance Registry System :2-Propynoic acid (471-25-0)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H226 Flammable liquid and vapour Flammable liquids Category 3 Warning H301 Toxic if swalloed Acute toxicity,oral Category 3 Danger P264, P270, P301+P310, P321, P330,P405, P501 H310 Fatal in contact with skin Acute toxicity,dermal Category 1, 2 Danger P262, P264, P270, P280, P302+P350,P310, P322, P361, P363, P405, P501 H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233 Keep container tightly closed. P280 Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.