Melting point :−78 °C(lit.)
Boiling point :111-112 °C(lit.)
Density :1.052 g/mL at 25 °C(lit.)
vapor density :4.3 (vs air)
vapor pressure :17 mm Hg ( 20 °C)
refractive index :n20/D 1.408(lit.)
Flash point :82 °F
storage temp. :2-8°C
solubility :Chloroform, DMSO (Sparingly)
form :Liquid
color :Colorless
Specific Gravity :1.052
explosive limit :5.2-61.2%(V)
Water Solubility :Hydrolyzes with water.
Sensitive :Air & Moisture Sensitive
Hydrolytic Sensitivity :4: no reaction with water under neutral conditions
BRN :956570
Exposure limits :TLV-TWA 10 mg/m³ (2 ppm) (ACGIH).
Stability :Moisture Sensitive
CAS DataBase Reference :121-45-9(CAS DataBase Reference)
NIST Chemistry Reference :Phosphorous acid, trimethyl ester(121-45-9)
EPA Substance Registry System :Trimethyl phosphite (121-45-9)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H226 Flammable liquid and vapour Flammable liquids Category 3 Warning 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 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 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H341 Suspected of causing genetic defects Germ cell mutagenicity Category 2 Warning P201,P202, P281, P308+P313, P405,P501 H351 Suspected of causing cancer Carcinogenicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. 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. 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. P308+P313 IF exposed or concerned: Get medical advice/attention.