Melting point :105-107 °C(lit.)
Boiling point :265.2±23.0 °C(Predicted)
Density :1.495±0.06 g/cm3(Predicted)
vapor pressure :0Pa at 20℃
storage temp. :-20°C
solubility :H2O: soluble2.88 g in 30 mL, clear, colorless
form :Crystalline Powder
pka :pK1:2.38;pK2:7.74 (25°C)
color :White to off-white
PH :0.9-1.4
Water Solubility :Soluble in water and alcohol.
Sensitive :Hygroscopic
λmax :λ: 260 nm Amax: ≤0.05
λ: 280 nm Amax: ≤0.04 BRN :1739372
Stability :Stable. Incompatible with strong oxidizing agents, strong bases.
LogP :-1.556 at 20℃
EPA Substance Registry System :Phosphonic acid, P-methyl- (993-13-5)

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
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.