2,6-TDI Isocyanate
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2,6-Toluene diisocyanate CAS # 91-08-7
Molecular weight 174.2
Isocyanate, % 48
Equivalent weight 85
Toxicity Analysis method OSHA air sampling method
Properties commercial material 

65/35    2,4/2,6
Assay, % 99.7 minimum
Isomer ratio (by infrared), %
   2,4 isomer 65.0-67.0
   2,6 isomer 33.0-35.0
Acidity (as HCl), % 0.005 maximum
Color, APHA 20 maximum
Hydrolyzable chlorides, % 0.007 maximum
NCO Content, % 48

III. TYPICAL PROPERTIES*

Appearance Clear, almost colorless liquid
Specific gravity @ 25°C 1.22
Weight per gallon, lb. @ 25°C 10.2
Total chlorides, % 0.05 maximum
Equivalent wt./avg. (as supplied) 87
Crystallizing point 39°F (4°C)
Flash point (Pensky-Marten closed cup) 260°F (127°C)
Refractive index @ 25°C 1.566
Boiling point 483°F (251°C)
NCO Content, % 48

Data Bayer product datasheet.
Regulatory Inventory
CAS REGISTRY NUMBER # 91-08-7 NAME : Benzene, 1,3-diisocyanato-2-methyl
TSCA USA Yes
DSL Canada Yes
EINECS Europe EINECS No. 202-039-0 Yes
ECL Korea ECL Serial No. KE-10915 Yes
ENCS Japan ENCS No. 3-2214X Yes
AICS Australia Yes
Other names: 
2,6-Diisocyanatotoluene
2,6-TDI
2,6-Toluene diisocyanate (2,6-TDI)
2,6-Toluylene diisocyanate
2-Methyl-m-phenylene isocyanate
Isocyanic acid, 2-methyl-m-phenylene ester
m-Tolylene diisocyanate
Commercial Products or generic terms used for products. For manufacturer see Isocyanate MFCT.
Commercial products are mixtures of isomers with 2,4-toluenediisocyanate
Cosmonate TDI Mondur TD    65/35 (2,4/2,6) Mondur TD80    80/20  (2,4/2,6)

Last edited on:

 July 06, 2006

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