Melting point :54 °C
Boiling point :238 °C(lit.)
Density :1.2
vapor pressure :<0.1 mm Hg ( 55 °C)
refractive index :1.4804
Flash point :306 °F
storage temp. :Store below +30°C.
solubility :3740g/l
form :Crystalline Platelets or Flakes
pka :12.72±0.10(Predicted)
color :slightly brown
PH :4-7.5 (100g/l, H2O, 23℃)
Water Solubility :3740 g/L (20 ºC)
BRN :1071237
Exposure limits :ACGIH: TWA 0.1 ppm; STEL 0.3 ppm
OSHA: TWA 0.75 ppm; STEL 2 ppm
NIOSH: IDLH 20 ppm; TWA 0.016 ppm; Ceiling 0.1 ppm Stability :Stable. Highly flammable solid. Incompatible with strong oxidizing agents, acid chlorides, acid anhydrides, strong acids, strong bases.
LogP :-0.73 at 25℃
CAS DataBase Reference :110-65-6(CAS DataBase Reference)
NIST Chemistry Reference :2-Butyne-1,4-diol(110-65-6)
EPA Substance Registry System :2-Butyne-1,4-diol (110-65-6)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes 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 H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501 H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501
Precautionary statements:	P260 Do not breathe dust/fume/gas/mist/vapours/spray. 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. P314 Get medical advice/attention if you feel unwell.