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 a. 2,4-TDI monomer.

H3C OCN O

b. Polyisocyanate of TDI.

N C

O C N

CH3 N C

NCO O

NCO H3 C

O

H H 2C O C N O

H3C CH2 C CH2

H O C N O

H H 2C O C N

NCO CH3 NCO CH3 NCO CH3

c. Prepolymer adduct of TDI and trimethylol propane.

Figure 1. Examples of isocyanate structures.

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NIOSH Manual of Analytical Methods