Melting point :38-44 °C
Boiling point :392 °C
Density :1.19
vapor pressure :0.066 hPa (20 °C)
refractive index :1.5906 (estimate)
Flash point :196 °C
storage temp. :-20°C
solubility :2g/l (decomposition)
Specific Gravity :1.180
color :White to Almost white
explosive limit :0.4%(V)
Water Solubility :decomposes
FreezingPoint :37℃
Sensitive :Moisture Sensitive/Lachrymatory
BRN :797662
Exposure limits :TLV-TWA 0.051 mg/m³ (0.005 ppm) (ACGIH and NIOSH); ceiling (air) 0.204 mg/m³ (0.02 ppm)/10 min (NIOSH and OSHA); IDLH 102 mg/m³ (10 ppm).
Dielectric constant :10.0（Ambient）
Stability :Stable. Combustible. Incompatible with strong oxidizing agents. Reacts violently with alcohols.
CAS DataBase Reference :101-68-8(CAS DataBase Reference)
IARC :3 (Vol. 19, Sup 7, 71) 1999
NIST Chemistry Reference :Benzene, 1,1'-methylenebis[4-isocyanato-(101-68-8)
EPA Substance Registry System :4,4'-Methylenedi(phenyl isocyanate) (101-68-8)

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 H332 Harmful if inhaled Acute toxicity,inhalation Category 4 Warning P261, P271, P304+P340, P312 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 H351 Suspected of causing cancer Carcinogenicity Category 2 Warning P201, P202, P281, P308+P313, P405,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:	P202 Do not handle until all safety precautions have been read and understood. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P280 Wear protective gloves/protective clothing/eye protection/face protection. P302+P352 IF ON SKIN: wash with plenty of soap and water. 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.