VOLUMETRIC DETERMINATION OF FREE ISOCYANATE IN URETHANE COATING RESINS.
ARMY COATING AND CHEMICAL LAB ABERDEEN PROVING GROUND MD
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A procedure is described for the determination of free isocyanate in urethane coating materials. Increasingly large quantities of urethane resins are being consumed and since the presence of relatively small amounts of free toluene diisocyanate TDI is considered a health hazard, it was considered essential to devise a procedure for its determination. Free TDI is separated from prepolymers and resins by vacuum distillation and the isolated isocyanate is determined volumetrically.
- Polymer Chemistry