Skip to main content
. Author manuscript; available in PMC: 2014 Jun 30.
Published in final edited form as: J Occup Environ Hyg. 2012;9(5):329–339. doi: 10.1080/15459624.2012.672871

TABLE III.

Isocyanate Air Concentrations Expressed as μg NCO/m3 STEL15min Compared with the UK-HSE All isocyanate STEL15min of 70 μg NCO/m3 and the Calculated Respirator MUC

Analyte N Range NCO μg/m3 Samples (%) >70 μg NCO/m3 Samples (%) >MUCA Painters (%) >MUCB
HDI monomer 224 0–15 0 0 0
IPDI polyisocyanate 228 12–1936 73 3 9
HDI uretdione 227 15–5408 30 5 15
HDI biuret 228 8–427 14 0 0
HDI isocyanurate 228 11–4341 85 20 52
Total HDI polyisocyanateC 228 52–6444 97 27 55
Total all isocyanate NCOD 228 65–5174 98 30 67

Note: UK-HSE STEL15min applies to any isocyanate.

A

OSHA-assigned APF x 70 μg/m3 NCO.

B

Percentage of painters for which one or more samples exceeded the respirator MUC (n = 33).

C

Sum of HDI uretdione, HDI biuret, and HDI isocyanurate.

D

Sum of HDI monomer, IPDI polyisocyanate, HDI uretdione, HDI biuret, and HDI isocyanurate.